For the next four days — July 31 through August 3, 2025 — the .30-06 M1 Garands and classic military rifles will fill the firing lines at Camp Perry. The National John C. Garand, Springfield, Vintage and Modern Military Match (GSMM) concludes Saturday, August 2, 2025, followed by an M14 Heritage Match and Vintage Sniper Match on Sunday, August 3rd. SEE CMP National Matches 2025 Calendar.
Some participants will shoot just one rifle type, but there is also a combined GSMM 4-Gun Aggregate. This GSSM Agg encompasses a series of position shooting matches on NRA SR targets at the CMP Nationals. Match scores will be posted on the CMP National Matches Results Page.
This video shows the Garand Match at Camp Perry. The rifles are still the same a decade later…
The annual GSMM event is one of the most popular events at Camp Perry, drawing participants from around the nation. One of America’s top GSSM shooters is Brian Williams, who was profiled in our Daily Bulletin. The 4-gun Aggregate includes M1 Garand, 1903 Springfield/1917 Enfield (or similar bolt rifle), M1 Carbine, and AR-type rifle for “Modern Military”.
GSMM matches attract new shooters as well as older competitors. You don’t need to make a huge investment in rifles or optics. We have friends who have done well with a “box stock” 1903 A3 Springfield they acquired from the CMP decades ago. On the firing line are a mix of seasoned competitors and novice shooters. They all come together to share common interests in marksmanship and historic firearms.
During CMP GSMM matches, CMP staff members are always on hand to ensure safety on the firing line and answer questions. This match is fun and efficient. The electronic targets, with monitors at each station, show shot location/score instantly. And there is no pit duty. Competitors never have to venture downrange to change or retrieve targets.
E-Targets at 2025 CMP National Matches
After years of testing, the Civilian Marksmanship Program (CMP) will make full use of eTargets at the 2025 National Rifle Matches at Camp Perry, which run July 20 through August 9, 2025. The advanced Kongsberg eTargets will be used at all Highpower rifle matches, National Trophy Rifle competitions, and Rifle Games events. In addition the eTargets will be used for the Rimfire Sporter Match on July 20 and the National Mid/Long Range Matches in August. The use of eTargets eliminates the need for pit duty, drastically cutting down the duration of each match. CLICK HERE to learn more about Camp Perry eTargets.
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.
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.
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 Dial Cartridge 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 $180.00 Dial Cartridge Comparator is supplied with multiple Datum Blocks of precise length and inside diameter (.3300″/.3750″/.4000″/.4375″). MORE INFO HERE.
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 $43.99 at MidwayUSA. 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 seven: .188″, .240″, .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. Mark one and use that consistently. 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.
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 (currently $140.00). 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.”
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.
