Forum member Erik Cortina has produced a series of YouTube videos about reloading hardware and precision hand-loading. Here we feature Erik’s video review of the Forster Co-Ax® reloading press. The red-framed Co-Ax is unique in both design and operation. It boasts dual guide rods and a central handle. You don’t screw in dies — you slide the die lock ring into a slot. This allows dies to float during operation.
Erik does a good job of demonstrating the Co-Ax’s unique features. At 1:00 he shows how to slide the dies into the press. It’s slick and easy. At the two-minute mark, Erik shows how sliding jaws clasp the case rim (rather than a conventional shell-holder). The jaws close as the ram is raised, then open as it is lowered. This makes it easy to place and remove your cases.
At the 5:20 mark, Erik shows how spent primers run straight down into a capture cup. This smart system helps keep your press and bench area clean of primer debris and residues.
While many Co-Ax users prime their cases by hand, the Co-Ax can prime cases very reliably. The priming station is on top of the press. Erik demonstrates the priming operation starting at 4:20.
Smart Accessories for the Co-Ax from Inline Fabrications
Forum member Kevin Thomas also owns a Co-Ax press, which he has hot-rodded with accessories from Inline Fabrications. Kevin tells us: “Check out the add-ons available from Inline Fabrications for the Co-Ax. I recently picked up a riser mount and a set of linkages for mine and love the results. The linkages are curved. When you replace the original straight links with these, the work area opens up substantially and the the press becomes much easier to feed.” CLICK HERE for Co-Ax Accessories.
Inline Fabrications Forster Co-Ax Accessories
Forster Co-Ax Curved Side Linkage (For Better Access)
We are re-publishing this article at the request of Forum members who found the information very valuable. If you haven’t read this Safety Tip before, take a moment to learn how you can inspect your fired brass to determine if there may be a potential for case separation. A case separation can be dangerous, potentially causing serious injury.
On the respected Riflemans’ Journal blog there was an excellent article about Cartridge Case-Head Separation. In this important article, Journal Editor GS Arizona examined the causes of this serious problem and explained the ways you can inspect your brass to minimize the risk of a case-head separation. As cases get fired multiple times and then resized during reloading, the cases can stretch. Typically, there is a point in the lower section of the case where the case-walls thin out. This is your “danger zone” and you need to watch for tell-tale signs of weakening.
The photo below shows a case sectioned so that you can see where the case wall becomes thinner near the web. You can see a little arrow into the soot inside the case pointing to the thinned area. This case hadn’t split yet, but it most likely would do so after one or two more firings.
Paper Clip Hack for Detecting Problems
The article provided a great, easy tip for detecting potential problems. You can use a bent paper clip to detect potential case wall problems. Slide the paper clip inside your case to check for thin spots. GS Arizona explains: “This simple little tool (bent paper clip) will let you check the inside of cases before you reload them. The thin spot will be immediately apparent as you run the clip up the inside of the case. If you’re seeing a shiny line on the outside and the clip is really hitting a thin spot inside, it’s time to retire the case. If you do this every time you reload, on at least 15% of your cases, you’ll develop a good feel for what the thin spot feels like and how it gets worse as the case is reloaded more times. And if you’re loading the night before a match and feel pressured for time — don’t skip this step!”
With the skyrocketing prices of ammo, more shooters than ever are hand-loading pistol and rifle ammunition. But many novice reloaders tell us that it’s a bit overwhelming in the beginning. Just learning all the technical terms (e.g. ogive, meplat, ballistic coefficient, load density etc.) is difficult, and the task of selecting the right tools and gear can be daunting.
The first thing a new reloader should do is find an experienced reloading mentor. One can learn the basics much more quickly under the guidance of an experienced hand-loader who “knows the ropes”. We also recommend that newbies acquire a good basic reloading handbook — not just a list of load recipes, but a book that explains the processes.
Since the first edition was published in the 1970s, the ABCs of Reloading series has taught countless firearms owners safe/reliable methods for creating their own ammunition. ABCs of Reloading provides beginners what they need to know to get started in reloading. From basic topics such as “How does a cartridge work?” and “What components do I need?” to more advanced discussions of cartridge pressure, headspace, and chrono testing, this is a great resource for new handloaders.
In addition, the sections on advanced reloading and new powders make the new edition valuable for experienced handloaders. And long-range shooters will benefit from the sections on making ultra-consistent ammo and fine-tuning for precision accuracy. Massaro’s coverage of new reloading gear and components is another bonus (shown below is the new RCBS MatchMaster powder dispenser).
Review from purchaser of “The ABCs of Reloading”, 8th Edition:
“When I first got the itch to load my own ammunition, I was overwhelmed by the amount of information and terminology involved in this fascinating field/hobby. It was very difficult to take all the individual pieces of information that I had and form it into an understandable process. I was snowed in under a blizzard of data that I was piecing together through chat rooms and web sites. Phrases like ‘roll crimp’ and ‘headspace’ came at me in a blizzard. I could look up each phrase, understand each one as a piece, but still the whole picture was fuzzy. In essence, that is what this book will do for you — turn it all into a coherent, linear whole. The writing is very solid and clear, the illustrations are well-done and helpful, and the information is very complete. After reading this book, the entire process made sense to me, and more importantly, I was fully warned about the dos and don’ts of the reloading world. The coverage is very complete. Primers, powders, bullets, and … all necessary tools and accessories are discussed and explained. This is just a great book. It won’t make you an expert … but it will put you on the right road if you wish to become one.” — Mykal Banta
In late 2020 Nosler released the Nosler Reloading Guide #9, the latest in a respected series of hardback Nosler load manuals. This 800-page guide covers 101 cartridge types. New in this edition you’ll find the popular 6mm Creedmoor, 6mm XC, 6.5 PRC, and 7.62×39, along with 20 Nosler, 22 Nosler, 24 Nosler, 27 Nosler and 33 Nosler. This new guide draws from thousands of hours in the Nosler Ballistic Lab, along with the experience of many respected experts.
Current Load Data for 101 Cartridge Types
The Nosler Reloading Guide 9 Reloading Manual provides load data for 101 rifle and handgun cartridges with hundreds of new powder additions. A comprehensive data set for today’s reloader, this manual is current with every bullet that Nosler offers through 2020 from 17 caliber up to 458 caliber in the rifle section and 9mm up to 45 caliber in the handgun section. Nine new cartridges were added to this manual. These include: 20 Nosler, 22 Nosler, 24 Nosler, 6mm Creedmoor, 6mm XC, 6.5 PRC, 27 Nosler, 7.62×39 and 33 Nosler. Also new for the Nosler Reloading Guide #9 are cartridge introductions written by veteran outdoor writers and industry tech experts. The 800-page book also has helpful “how-to” sections such as “Getting Ready to Reload”.
Q. Why Buy a Book when Load Data is Available Online from Powder Makers?
There are good, solid reasons to buy print-format loading guides produced by bullet-makers. If you go to the Hodgdon online Reloading Data Center you’ll only find loads with Hodgdon, IMR, and Winchester powders — the key brands they sell. In a book such as this Nosler #9 or the Sierra Reloading Manual, you will find loads with a much wider selection of powders including Vihtavuori, Alliant, Accurate, Norma, Ramshot, and other brands. You won’t find a Reloder 16 or VV N140 load on Hodgdon’s website.
In addition, it is handy to have loads in a print edition which is easy to access on your load bench. You don’t need a computer or an internet connection. And using a book is often faster than a web interface when quickly scanning through a variety of bullet choices for a cartridge.
Along with the new Nosler #9 Manual, here are four other Recommended Reloading Manuals:
When your cases become hard to extract, or you feel a stiff bolt lift when removing a cartridge, it’s probably time to full-length size your cases, and “bump” the shoulder back. Short-range benchrest shooters, running high pressures, typically full-length size every load cycle, bumping the shoulder .001-.002″. The vast majority of mid-range and long-range F-Class shooters also full-length size every time. High Power shooters with gas guns should definitely full-length size every time, and may need to bump the shoulders .003″ or more to ensure reliable feeding and extraction.
Use Shims for Precise Control of Shoulder Bump
Some shooters like to set the “default” position for their full-length die to have an “ample” .003″ or .004″ shoulder bump. When they need less bump, a simple way to reduce the amount of shoulder movement is to use precision shims in .001″ (one-thousandth) increments. Brownells offers a set of seven (7) shims for your standard 7/8-14 FL sizing dies for $14.99. These Sinclair Int’l shims are Brownells Item 749-001-325WB. They may be out of stock, but they can be back-ordered.
Sinclair explains: “Each shim is notched for easy size identification. Just set your die using one of the middle thickness shims. Adjustments can be made easily by changing shims to increase or decrease die depth without changing the stem setting. This is a great upgrade for non-micrometer adjustable dies.”
Here are reports from Forum members who use the shims:
“Great product. I have my die lock ring(s) adjusted for the shortest headspace length on my multiple 6BRs and 6PPCs. When needing a longer headspace, I just refer to my notes and add the appropriate shim under the lock ring. Keep it simple.” — F.D. Shuster
Mats Johansson writes: “I’ve been using [shims] since Skip Otto (of BR fame) came out with them. I set up my dies with the .006″ shim, giving me the option of bumping the shoulder a bit more when the brass gets old and hardens while still having room to adjust up for zero headspace, should I have missed the original setup by a thou or two. Hunting rounds can easily be bumped an extra .002-.003″ for positive, no-crush feeding. Being a safety-oriented cheapskate, I couldn’t live without them — they let me reload my cases a gazillion times without dangerous web-stretching. Shims are a must-have, as simple as that.” — Mats Johansson
Brownells offers the seven-piece set of Sizing Die Shims that let you adjust the height of your die (and thereby the amount of bump and sizing) in precise .001″ increments. Sinclair explains: “Some handloaders will set their die up to achieve maximum sizing and then progressively use Sinclair Die Shims between the lock ring and the press head to move the die away from the shellholder. Doing this allows you to leave the lock ring in the same position. These shims are usually available in increments of .001″ and work very well.”
Seven Shims from .003″ to .010″
For use with 7/8-14 threaded dies, Sinclair’s $14.99 Die Shim Kit (Sinclair item 22400 or Brownells Code 749-001-325WB) includes seven shims in thicknesses of .003, .004, .005, .006, .007, .008, and .010. For ease of use, shim thickness is indicated by the number of notches cut in the outer edge of each shim. Even without looking you can “count” the notches by feel.
NOTE: These shim sets can also be use to adjust bullet seating depth for seating dies that lack micrometer adjustment. Use the same 7/8-14 shims with your non-micrometer seating dies.
At the request of our readers, we provide select “Deals of the Week”. Every Sunday afternoon or Monday morning we offer our Best Bargain selections. Here are some of the best deals on firearms, hardware, reloading components, optics, and shooting accessories. Be aware that sale prices are subject to change, and once clearance inventory is sold, it’s gone for good. You snooze you lose.
1. Midsouth — RCBS Explorer Reloading Kit, $399.99
⏺ RCBS Kit includes all vital tools — good for new hand-loaders
In recent months, there has been very high demand for reloading tools. Many popular presses and combo kits have been sold out. Here’s good news — Midsouth has received Press Kits from RCBS. Great for folks getting started in reloading, this kit includes the single-stage press, powder measure, priming tool, trickler, digital scale, load manual, and various accessories. Get the RCBS Explorer Kit 2 for $399.99. But don’t delay. Midsouth also had a Hornady L-N-L Classic Kit for $373.91 but that sold out in 3 days.
2. Grafs.com — BOG Deathgrip Camo Tripod, $179.95
⏺ Versatile tripod mounts quickly, securely — use for PRS/NRL or hunting
If you are a long-range hunter, or shoot PRS/NRL matches, this is a great tripod. The Clamp-type head quickly secures to your rifle’s forearm for a secure shooting solution. Hunters will favor the BOG Deathgrip Tripod with New-for-2021 RealTree Excape Camo offered by Grafs.com for $179.95. If you are happy with a basic black aluminum version, MidwayUSA has the older black BOG Deathgrip Tripod for $129.99 on sale (ADD to cart to see this price).
3. Palmetto SA — Typhoon AR-style 12 GA Shotgun, $599.99
⏺ Formidable 12ga power with familiar AR15 ergonomics
This mag-fed, semi-automatic X12 shotgun offers familiar AR-15 ergonomics and controls. This Typhoon Defense 12ga scattergun features a 7075 T6 aluminum upper receiver constructed and a lightweight polymer lower receiver. The X12 ships with three (3) 5-round magazines and multiple chokes. Recent purchaser was pleased: “Once [broken in] cycles through weak and hot ammo easily.” The mags, which require some effort to load, hold both 2 3/4″ and 3″ 12ga shells.
⏺ Smart new Die System simplifies loading multiple cartridge types
Are you tired of buying another expensive seating die every time you try a new cartridge type? With the unique Frankford Arsenal Universal Bullet Seating Die you can have one die that loads multiple cartridge type. This cleaver bullet seating system includes 3 different stems and 9 sleeves allowing you to seat .224 to .338-caliber bullets with this one die system. Forum members using this system have praised it. NOTE: the universal seating die comes with the .308-caliber sleeve pre-installed. The other 8 sleeves are provided in the box.
5. Bushnell — 20% OFF Hunting Scopes ($150.00 Max Rebate)
⏺ Great Rebate program for Bushnell scopes purchased this month
Need a hunting scope? Then check out this 20% OFF Bushnell Rebate. Get 20% Back on any BUSHNELL hunting riflescope priced OVER $179.99. Product must be purchased in the month of March between 3/1/2021 through 3/31/2021. Maximum rebate value is $150 per person or household. NOTE: This Rebate excludes Bushnell tactical riflescopes. DEADLINE for mail in or online submission 4/30/2021. CLICK HERE for REBATE FORM.
6. Amazon — Frankford Arsenal Lite Tumbler, $79.99
⏺ Great price — save 44% on Wet Tumbler for brass
Wet tumbling works very effectively to get your brass “squeaky clean” inside and out. And right now you can get a good mid-sized tumbling system at huge savings. The Frankford Arsenal Lite Tumbler is just $79.99 at Amazon, a 44% savings off the regular price. This direct-drive unit with 3.3L capacity can hold up to 300 pieces of .223 Rem brass. We recommend adding Frankford’s Rotary Tumbler Straining Cap, sold separately.
Putting together a varmint rifle for the spring. Here’s a killer deal on a 5-20x44mm Bushnell Nitro. This is a second focal plane scope with a nice, MOA-based reticle. With this deal you can save 54% off the regular $499.99 price. If you are looking for a lower-magnification scope, consider the 2.5-10x44mm Nitro for just $169.49 a $180 savings.
⏺ Sweet deal on Ear and Eye Protection — good spare set for friends
Every shooter needs good eye and ear protection. Get BOTH the E-Max Muffs and Shooting glasses for just $28.69 on Amazon with free shipping. This combo can be an affordable spare set for yourself or to have on hand for your guests. The E-Max earmuffs offer a 23 dB Noise Reduction Rating while allowing you to hear range commands.
⏺ Great deals for AR500 steel targets — watch video above right
On sale now at Midsouth Caldwell’s new bright, easy-to-see targets come in all shapes and sizes for competition, training, and recreational use. Made of AR500 hardened steel, these targets can withstand thousands of rounds. Rated up to a 3000 fps impact velocity and a 3500 ft-lb impact energy, these targets come in seven various sizes with three hanging solutions. These bright yellow AR500 targets are On Sale now at Midsouth, starting at just $14.79 for 5″ Gong Target.
10. Amazon — Motion-Sensor LED Interior Light, $13.99
⏺ Activates when door opens, Rechargeable, 3 LED Light Levels
Here’s a great accessory for your Gun Safe or closet. This rechargeable LED Lamp turns itself on when you open the door, and off when you close the door. Select three brightness levels: 10LED, 20LED, 30LED. With the supplied 3M adhesive magnetic strip you can easily attach the light to the inner walls of your gun safe. And then quickly remove the unit for charging with a standard USB cord (no batteries to replace!). It works, it’s handy, and it’s inexpensive — just $13.99 on Amazon. These motion-sensor LED lamps can also be used in garages or stairwells. NOTE: this is Amazon’s choice for rechargeable LED Motion-Sensor lights.
With 7 million new gun owners, and ammo hard to find at reasonable cost, hundreds of thousands of Americans are looking to get started with handloading. While we always recommend new reloaders have a living, breathing human teacher/mentor. It is possible to learn important skills through instructional videos. Here’s a good 4-part series that can help reloading novices AND serve as a refresher course for those who need to brush up their skill set).
This 4-part video series first guides the new hand-loader through the gear/hardware selection process. Then the videos cover, step-by-step, all the key processes of reloading from start to finish. If you are new to hand-loading, or just want a reloading refresher course, we recommend you watch this 4-part series from Tactical Life, part of the Athlon Outdoors Network.
WARNING!! We have embedded the Videos below. You can watch ALL four videos, but each will play back at the TOP. NOTE: They are all the same for the first 30 seconds, so you may want to skip forward. These videos may play back better if you go to the Tactical Life Website. Access: CLICK HERE.
Learn More in Tactical Life’s The Complete Book of Reloading (2020 Edition)
This publication includes over 2000 handgun and rifle loads. In addition, The Complete Book of Reloading (2020) reviews 8 modern Progressive Presses. Take note — there is a special report on the LabRadar Chronograph. Long-range Hunters will enjoy a feature article on the new 6.5 PRC Cartridge. In the “Handloaders’ Stockpile” a variety of new products to make your hours at the bench more productive are reviewed. The issue also has feature stories on Wildcat Cartridges, Subsonic loads, and .44 Magnum loads for both rifle and pistol. There is a Bonus 33-Page Hodgdon and Alliant Load Data Guide.
Many thousands of hand-loaders, including this Editor, acquired the original RCBS ChargeMaster 1500 powder scale/dispenser. Mine has worked well for many years. Yes I do have to watch for scale drift, and I use a high-end Force-Restoration scale when loading for major matches, but the original ChargeMaster has served me well, throwing thousands of charges over the years.
RCBS ChargeMaster Lite Reviews
A few years ago, RCBS introduced a new version of the ChargeMaster, the RCBS Chargemaster Lite. This newer unit has some features we really like. The new touch screen is easy to use and the powder tray cover slips off easily — no more hinges to fight. Most importantly the CM Lite has a redesigned, fluted dispensing tube which delivers powder kernels in a smooth flow with no clumps. The RCBS Rep told us “No more McDonald’s straw required”. We tested the unit and it does seem like the newly-designed dispensing tube is better. In fact, this new design will be adapted to the next generation of larger ChargeMasters. The ChargeMaster Lite ships complete with calibration check weights and cleaning brush. MSRP is $299.95 with “street price” around $239.99 at Amazon.
If you’re interested in the RCBS ChargeMaster Lite, here are three recent video product reviews. By watching these videos you can see all the features of the ChargeMaster Lite demonstrated. In the third video, the host also “compares and contrasts” the ChargeMaster Lite with the original ChargeMaster 1500, explaining the differences between the two units. Have at it:
Panhandle Precision ChargeMaster Lite Bench Test and Demo (Good Detailed Review):
Here is the RCBS Press Release: “The new RCBS ChargeMaster Lite packs unparalleled powder-measuring accuracy in a compact package. The one-piece unit features an LCD touchscreen display that ensures accurate data input. The hopper holds nearly a pound of smokeless powder, and can dispense anywhere between 2 to 300 grains with a +/-0.1-grain accuracy.”
UltimateReloader ChargeMaster Lite Unboxing:
Original ChargeMaster 1500 vs. ChargeMaster Lite:
Worth Considering Also — the Frankford Arsenal Platinum Series Intellidropper
Frankford Arsenal also offers an electronic powder scale/dispenser, the Intellidropper. This unit dispenses quickly, loads can be controlled with a Mobile App. Two years ago we did an in-depth Intellidropper Review. If you are in the market for a powder scale/dispenser, you should definitely consider the Intellidropper as well as the RCBS Chargemaster Lite. Watch this video to see how it works:
The Intellidropper is the most high-tech powder scale/dispenser to hit the market. This machine offers a unique powder calibration mode and the first-ever, mobile APP-controlled powder dispensing system. With a retail price under $200, the new Intellidropper is $70 less than the ChargeMaster Lite.
Can you form a wildcat cartridge such as the 6mm Dasher or 6 BRA (BR Ackley) without expending primer, powders, and bullets? Absolutely. Using the hydro-forming method you can form improved cases in your workshop with no firing whatsoever, so there is no wear on your precious barrel. Watch this video to see how it’s done for the 6 Dasher:
6 Dasher Case Hydro-Forming Demonstration:
Forum member Wes J. (aka P1ZombieKiller) has produced a helpful video showing how to form Dasher cases use the Hornady Hydraulic forming die kit. This includes a two-part die (body and piston), and a special shell holder. To form the case, you insert a primer in your virgin brass, top the case off with with a fluid (water or alcohol), then run the case up into the Hydro-forming die. A few stout whacks with a hammer and your case is 95% formed.
Hydro-Forming Procedure Step-by-Step:
1. Insert spent primer in new 6mmBR brass case.
2. Fill with water or alcohol (Wes prefers alcohol).
3. Wipe excess fluid off case.
4. Place case in special Hornady shell-holder (no primer hole).
5. Run case up into Hydraulic forming die.
6. Smack top piston of forming die 3-4 times with rubber mallet or dead-blow hammer.
7. Inspect case, re-fill and repeat if necessary.
8. Drain alcohol (or water) into container.
9. Remove primer (and save for re-use).
10. Blow-dry formed case. Inspect and measure formed case.
Wes achieves very uniform cartridge OALs with this method. He measured ten (10) hydro-formed 6 Dasher cases and got these results: two @ 1.536″; 2 @ 1.537″; and 6 @ 1.538″.
Three or Four Whacks Produces a 95%-Formed Case
With a Hornady hydro-forming die, hydraulic pressure does the job of blowing out the shoulders of your improved case. The process is relatively simple. Place a spent primer in the bottom of a new piece of brass. Fill the case with water, and then slip it into a special Hornady shell-holder with no hole in the middle. Then you run the case up into the forming die. Now comes the fun part. You gently insert a plunger (hydraulic ram) from the top, and give it three or four stiff whacks with a mallet (or better yet, a dead-blow hammer). Remove the plunger and you have a 95% formed case, ready to load.
Special Shell-Holder
Hornady supplies a shell holder made specifically for the hydro die; there’s no hole in the bottom of it. Just insert a spent primer into the primer pocket and you’re ready to go. The spent primer, combined with the solid shell holder, keeps the water from seeping out of the primer pocket. The primer pushes out a little bit during this process, but it’s impossible for it to come out because of the way the shell holder is designed. The shell holder has a grove which allows the case to slide out of the shell holder even when the primer protrudes a bit.
Another Option — Hydro-Forming by DJ’s Brass Service
If you want to hydro-form your brass to save barrel life but you don’t want to go through the effort, or purchase the hydro-forming dies, there is a very good option. Darrell Jones of DJ’s Brass Service will do the job for a modest charge. You send Darrel your brass and he does all the hard work, preparing perfectly formed brass. Darrell can also anneal and/or neck-turn your cases — all for a reasonable fee.
DJ’s Brass Service offers case hydro-forming to your exact specs. Darrell Jones offers this service for a variety of popular cartridges: 6 PPC, 30 PPC, 30 BR, 6 BRA (BR Ackley), 6mm Grinch, 6 BRDX, 6 BRX, .260 Ackley, .284 Shehane and of course the very popular 6mm Dasher. After hydro-forming your brass, Darrell can also neck-up or neck-down the cases to meet your needs. For example, if you shoot a 22 Dasher, Darrell can hydro-form the cases to a 6 Dasher and then neck them down to .22 caliber. He can also turn the necks to your specs (for an additional charge). Hydro-forming by Darrell costs $0.60 (sixty cents) per case with a minimum order of $60 per hundred. NOTE: After cases are hydro-formed by Darrell, every case is washed, cleaned, and re-annealed. This cleaning and annealing process is included in the $0.60 (sixty cents) per case price.
The Tactical Rifle Shooters Facebook Group recently showcased tools used to measure case headspace before and after “bumping” the shoulder. After a case is fired, hand-loaders who full-length size their cases will typically bump the shoulders back anywhere from .001″ to .0035″, depending on the rifle and application. With our 6mmBR and Dasher cases we like about .0015″ bump.
You want the amount of case sizing and bump to be the same for all your brass. To ensure uniformity, it makes sense to measure your cases before and after the FL sizing process. When we have time, we check every case. Other folks will simply check the first 3-4 cases coming out of the FL sizing die to ensure the FL die setting is correct and delivering desired headspace/bump.
1. Whidden Gunworks Shoulder Bump Gauge
There are a variety of tools that can be used to measure shoulder bump. Our favorite is a special cartridge-specific bushing made by Whidden Gunworks. The Whidden Shoulder Bump Gauge enables you to adjust your sizing die to the desired measurement. The bump gauge is attached to your calipers with a set screw and determines the measurement from the base to the shoulder of the case. The photo below, from Tactical Rifle Shooters, shows the Whidden Bump Gauge for the .375 CheyTac cartridge.
2. Dave Manson Vertical Comparator with Dial Read-Out
Dave Manson states: “This tool was designed to make life easier for the advanced shooter and re-loader by allowing precise measurement of ammunition, case, and chamber headspace. With this information, the re-loader will be able to fine-tune clearances and fits between his ammunition and chamber, with resultant improvements in accuracy and case life.” The functions of the Manson Comparator are:
1. Measure headspace of factory or reloaded ammunition
2. Quantify chamber headspace by measuring headspace of a fired case
3. Ensure minimal shoulder set-back when setting up re-loading dies
4. Compare base-to-ogive length to ensure consistent bullet-to-rifling relationship.
In addition to the Dial Indicator and Stand, the $130.00 Vertical Comparator is supplied with multiple Datum Blocks of precise length and inside diameter (.3300″/.3750″/.4000″/.4375″). MORE INFO HERE — Catalog page 20.
3. Hornady L-N-L Headspace Comparator System
Hornady’s Lock-N-Load Headspace Comparator system is easy-to-use and handy. You can get a kit with Red bushing-holder body and 5 bushings for $40.12. Hornady explains: “The Lock-N-Load® Headspace Comparator… gauge measures variations in brass before and after firing or re-sizing. It allows for headspace comparison between fire-formed brass and re-sized brass.” IMPORTANT: Hornady states: “To determine the proper bushing diameter for your cartridge, simply add the neck diameter and the shoulder diameter and divide that number by two. Use the bushing closest to that number.” Hornady offers five: .330″, .350″, .375″, .400″, and .420″.
One tip — We have found the Hornady gauges may vary a little from unit to unit even with the same nominal size. If you have more than one gauge for the same cartridge, test each on your brass — you may then note a slight difference in your bump measurements. There is also an Anvil Base Kit that mounts to the opposite blade on the caliper. This provides a more stable surface for the base of your case.
4. L.E. Wilson Case Gage Depth Micrometer
If you are looking for precise “bump” measurements without having to mess with calipers and clamp-on gauge blocks, you may want to consider the L.E. Wilson Case Gage Depth Micrometer. This takes very precise, repeatable measurements, but you need to know your starting point. The manufacturer explains: “Every reloader should know exactly how much your Full Length Sizing Die is pushing back the shoulder. With the NEW Case Gage Depth Micrometer you can do just that! It has never been easier to measure you cases headspace before and after sizing. The Depth Mic allows you to slip the micrometer perfectly over the top of the Gage with your case inserted into the Gage and take a measurement. Micrometer has graduations of .001″. The Case Gage Depth Micrometer is set to a zero of .100″ on the scale at our factory. Because of differences in ‘feel’ and temperature, we include a the Gage Block for you to test Zero and to adjust if necessary.”
5. Pistol Brass Case DIY Bump Gauge
Last is a “field expedient” set-up if you do not have any of the comparator tools shown above. A sized .45 ACP case (or other suitable pistol case) can be used to measure shoulder bump. The mouth of the pistol case sits on the shoulder of your rifle cartridge brass.
Make sure the .45 ACP case is trimmed square and that it is round. We recommend you first run it through an expander, then size it, trim it and chamfer. Next, take the .45 ACP case and slip it over the neck of a fired, unsized rifle case with the primer removed. Align the two cases between the jaws of your calipers and note the length from rim to rim (See left photo below).
OK, now you have the length for a fired rifle case BEFORE sizing. Next, take a full-length sized rifle case (without primer) and do the same thing, placing the .45 ACP case over the neck of the FL-sized case (Right Photo). The difference between the two numbers is the amount of “bump” or set-back you are applying to the shoulder. Here the difference is .0015″. The amount of bump you need varies with your chamber and your load, but .0015-.002″ is a good initial setting.
On the respected Riflemans’ Journal blog there was an excellent article about Cartridge Case-Head Separation. In this important article, Journal Editor GS Arizona examined the causes of this serious problem and explained the ways you can inspect your brass to minimize the risk of a case-head separation. As cases get fired multiple times and then resized during reloading, the cases can stretch. Typically, there is a point in the lower section of the case where the case-walls thin out. This is your “danger zone” and you need to watch for tell-tale signs of weakening.
Learn More in Tactical Life’s The Complete Book of Reloading (2020 Edition)
Hydro-Forming Procedure Step-by-Step:
Special Shell-Holder
