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August 17th, 2021

IBS 2021 1000-Yd Benchrest National Championship in Montana

IBS 1000 yard championship long range deep creek missoula montana mt light gun heavy dasher 6bra
Photo by Forum member Dave Way.

IBS 1000-Yard National Championship
The IBS 1000-Yard Benchrest National Championship took place this past weekend, August 14-15, at the scenic Deep Creek Shooting Range outside Missoula, Montana. The Match was well attended, with 66 shooters in the Light Gun (LG) division, and 62 in Heavy Gun (HG). The venue was beautiful (as always), but conditions were challenging at times. One shooter noted: “The wind was brutal the last relay. Many shooters DQ’d”.*

Despite the tough conditions, there were some very impressive performances. Jason Walker took the Overall title, based on combined LG and HG standings. Shooting well in both classes, Jason (aka “LRPV” in our Shooters’ Forum) finished 3rd in LG and 6th in HG. Jason’s LG group size Agg was an impressive 4.357″. Nick Howlett was second Overall. Steve Simons won the LG division while James Bradley topped the HG field.

IBS 2021 1000-Yard Nat’l Championship Two-Gun Overall Results (LG + HG)
IBS 2021 1000-Yard Nat’l Championship Light Gun Overall Results
IBS 2021 1000-Yard Nat’l Championship Heavy Gun Overall Results**

Top Five Two-Gun Overall

Jason Walker
Nick Howlett
James Bradley
Richard Jette
Dave Way

Top Five LG Overall

Steve Simons
David Torgerson
Jason Walker
Todd Zaun
Richard Jette

Top Five HG Overall

James Bradley
Jason Walker
Nick Howlett
Jason Peterson
Tom Mousel

IBS 1000 yard championship long range deep creek missoula montana mt light gun heavy dasher 6bra
Winners photo courtesy Jason Walker, 2021 IBS 1000-Yard Two-Gun Champion.

IBS 1000 yard championship long range deep creek missoula montana mt light gun heavy dasher 6bra

Gunsmith Alex Wheeler, who built many of the top-finishing rifles, noted: “Congratulations to the winners, you pulled your way to the top in some pretty tricky conditions. It was good to see every one again as well as meeting some in person for the first time.”

Equipment Used by Light Gun and Heavy Gun Competitors

The equipment lists, for both Light Gun and Heavy Gun, were heavily dominated by Krieger barrels. The Overall Winner and both LG and HG class winners used Kriegers. There were also many Bartlein barrels and Lilja barrels. But surprisingly, the equipment lists only showed 5 Brux barrels in Light Gun and 3 Brux barrels in Heavy Gun. BAT actions were the most common in both divisions, followed by Borden actions.

IBS 1000-Yd Light Gun Equipment List | IBS 1000-Yd Heavy Gun Equipment List

The vast majority of the shooters ran a 6mm cartridge in both Light Gun and Heavy Gun divisions. These were overwhelmingly 6mm Dashers and 6 BRAs. The 6 BRA (aka 6mmBR Ackley Improved) has a 40-degree shoulder like the Dasher, but with a longer neck. There were a half-dozen .300 WSMs in Heavy Gun division, and a couple 7mm RSAUMs, but the 6 Dashers and 6 BRAs dominated the field, even in HG.

6mm Dasher 6BRA BRA cartridge

Overall Winner Jason Walker was shooting two 6mm Dasher rifles. Both guns had BAT actions, Krieger barrels, and Nightforce scopes. Jason’s Heavy Gun had a Maxi-Tracker stock while his Light Gun had a PR&T LowBoy stock. In both rifles, he ran a 6mm Dasher loaded with Vapor Trail bullets pushed by Hodgdon Varget powder and CCI BR4 primers. Jay Cutright did the barrel work while Gordy Gritters worked on the PR&T stock. (NOTE: Jason changed to the LowBoy stock after the LG equipment list was submitted.)

Light Gun Overall winner Steve Simons was running a 6 BRA in Light Gun. Steve’s LG, smithed by Alex Wheeler, had a BAT action, Krieger barrel, Wheeler LRB stock, and Vortex scope. He loaded his 6 BRA cases with Vapor Trail bullets, Hodgdon H4895 powder, and CCI 450 Primers.

Heavy Gun Overall winner James Bradley was also running a 6 BRA in Heavy Gun. Again this had a BAT Action, Krieger barrel, Wheeler LRB stock, and Vortex scope. The rig was smithed by North Ridge Rifles. James shot Vapor Trail bullets, H4895 powder, and Federal 205M primers.

Krieger barrels

deep creek range missoula MT
Looking back at the firing line from the target berm.

Deep Creek Range
The Deep Creek Range in Missoula, MT is one of the nicest places to shoot in the Intermountain West region. The range is located in the mountains within a few minutes drive of Missoula, and there is camping on-site. When conditions are good at Deep Creek, records get broken. To learn more about shooting at Deep Creek, contact Jamey Williams at jameydan[at]gmail.com.

Here is an aerial view of the Deep Creek Range (Drone video by David Gosnell):

* One shooter at the match reported that: “Our last HV gun relay of the Match produced 11 DQs out of 13 competitors.” We have not confirmed this, but even if there were just a handful of DQs is is unfortunate for those HG competitors.
** This is the Heavy Gun Overall, as designated on the right top. However, the columns are erroneously titled “Light Gun”. If you compare the two linked results pages, you will see that they are NOT the same.

Permalink - Articles, Competition, Gear Review, News No Comments »
August 17th, 2021

Cartridge Base to Ogive (CBTO) Length — Factors to Consider

chamber length loading berger bullets
Here are two different bullet types, seated to the same CBTO length, but different COAL. Note the shiny scratches on the bullets made by the comparator tool which indicates a point on the bullet ogive near where the ogive will engage the rifling.

Berger Bullets COAL length cartridgeEffects Of Cartridge Over All Length (COAL) And Cartridge Base To Ogive (CBTO) – Part 2
by Bryan Litz for Berger Bullets.
Part One of this series focused on the importance of COAL in terms of SAAMI standards, magazine lengths, seating depths, and pressure levels. Another measure of length for loaded ammunition is highly important to precision, namely Cartridge Base to Bullet Ogive Length (CBTO).

Figure 2. Chamber throat geometry showing the bullet jump to the rifling or lands.
chamber length loading berger bullets

Look at Figure 2. Suppose the bullet was seated out of the case to the point where the base of the bullet’s nose (ogive) just contacted the beginning of the riflings (the lands) when the bolt was closed. This bullet seating configuration is referred to as touching the lands, or touching the riflings and is a very important measurement to understand for precision hand-loading. Due to the complex dynamics of internal ballistics which happen in the blink of an eye, the distance a bullet moves out of the case before it engages the riflings is highly critical to precision potential. Therefore, in order to systematically optimize the precision of his handloads, it’s critically important that the precision hand-loader understands how to alter bullet seating depth in relation to the barrel rifling. Part of the required knowledge is understanding how to accurately and repeatably measure the Cartridge Base To Ogive (CBTO) dimension. This is explained in the FULL ARTICLE.

Bryan Litz offers an extended discussion on how to measure CBTO using different tools and methods, including the Hornady OAL gauge. You can read this discussion in the full article found on the Berger Bullets website. CLICK HERE to Read Full Article.

Why Not Use CBTO as a SAAMI Standard?
If CBTO is so important to rifle accuracy, you might ask, “Why is it not listed as the SAAMI spec standard in addition to COAL?” There is one primary reason why it is not listed in the standard. This is the lack of uniformity in bullet nose shapes and measuring devices used to determine CBTO.

Benefits of Having a Uniform CBTO
There is another aspect to knowing your CBTO when checking your COAL as it pertains to performance. With good bullets, tooling, and carefully-prepared cases you can easily achieve a CBTO that varies less than +/- .001″ but your COAL can vary as much as .025″ extreme spread (or more with other brands). This is not necessarily bad and it is much better than the other way around. If you have a CBTO dimension that varies but your COAL dimension is tight (within +/- .002″) then it is most likely that your bullet is bottoming out inside the seater cone on the bullet tip. This is very bad and is to be avoided. It is normal for bullets to have precisely the same nose shape and it is also normal for these same bullets to have nose lengths that can vary as much as .025″.

Summary of Cartridge Base To Ogive (CBTO) Discussion
Here are four important considerations regarding bullet seating depth as it relates to CBTO:

1. CBTO is a critical measurement to understand for handloaders because it’s directly related to precision potential, and you control it by simply setting bullet seating depth.

2. Tools and methods for measuring CBTO vary. Most of the measurement techniques have pitfalls (which may give rise to inconsistent results) that you should understand before starting out.

3. A CBTO that produces the best precision in your rifle may not produce the best precision in someone else’s rifle. Even if you have the same rifle, same bullets, same model of comparator gauges, etc. It’s possible that the gauges are not actually the same, and measurements from one don’t translate to the same dimension for another.

4. Once you find the CBTO that produces the best precision in your rifle, it’s important to allow minimal variation in that dimension when producing quality handloads. This is achieved by using quality bullets, tooling, and properly preparing case mouths and necks for consistent seating.

CLICK HERE to Read Full Article with More Info
Article sourced by EdLongrange. We welcome tips from readers.
Permalink Bullets, Brass, Ammo, Reloading, Tech Tip No Comments »
August 17th, 2021

TECH Tip — When and How to Clean Your Reloading Dies

Hornady Die cleaning

After purchasing a new set of dies from Forster, Hornady, Redding, or Whidden Gunworks, you’ll want to disassemble the dies, inspect then, and then remove the internal grease and/or waxy coatings placed on the dies by the manufacturer. Here are two video that show how to de-grease and clean dies as they come “out of the box” from the manufacturer. In the first video, from Creedmoor Sports, Bill Gravatt (now President of Capstone Precision Group) shows various methods for cleaning dies both when new and after they have accumulated carbon and lube after use. This video is definitely worth watching. In the second video, a Hornady technician shows the method for degreasing dies before first use. A convenient aerosol spray cleaner is used in the video. You an also use a liquid solvent with soft nylon brush, and cotton patches. NOTE: After cleaning you may want to apply a light grease to the external threads of your dies.

Creedmoor Sports Die Cleaning Video with Bill Gravatt

Hornady Video Showing Aerosol Cleaner

Clean Your Sizing Dies and Body Dies Regularly
These same techniques work for cleaning dies after they have been used for reloading. Many otherwise smart hand-loaders forget to clean the inside of their dies, allowing old case lube, gunk, carbon residue, and other contaminants to build up inside the die. You should clean your dies fairly often, particularly if you do not tumble or ultrasound your cases between loadings. It is most important to keep full-length sizing and body dies clean. These dies accumulate lube and carbon residue quickly.

Permalink Reloading, Tech Tip 2 Comments »