Reference: MTM-RM-50-10

Brand: MTM-Caseguard


220 Swift, 300 Sav., 338 RCM, 225 / 243 / 307 / 308 Win., 338 Fed., 25 / 32 / 6mm Rem., 28-30 Sevens, 30 Rem. AR, 360 Nitro Express 2 1/4”, 5.6 x 52 Rimmed, 6.5 Creedmoor, 6.5x50 Jap Arisaka, 6mm-284 Win., 7.35 Carcano, 7.5 x 54 French MAS, 7.65 x 53 Mauser, 7mmTCU, 7mm-08 Rem.. Max. OAL= 3.04"

Price R105.00
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Peterson 22 Creedmoor (SRP) Brass Cartridge Cases (50)


Peterson 22 Creedmoor (SRP) Brass Cartridge Cases (50)

Small Rifle Primer

50 per box

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According to Derek Peterson, president of Peterson Cartridge, “We decided to build the tooling to make .22 Creedmoor brass in response to the uptick in long-distance predator and varmint hunting. Plus the round is just straight-up fun to shoot. It is a low-recoil, flat shooting, wind-bucking round; deadly accurate up to 800 yards.”

Peterson Cartridge also makes 6.5 and 6mm Creedmoor casings. “But when we designed the tooling for the .22 Creedmoor we set out to make casings with improved features,” Peterson stated. “And we were successful. We increased the head hardness to tolerate higher pressures. And we increased our internal volume slightly to work better with the slow burning powders (like RL 26, or H1000) which people favor for this round.”

Prior to this, shooters had to take 6mm or 6.5 Creedmoor casings and neck them down to .22. There are a few problems with necking down. When you take a larger caliber with the correct neck wall thickness and neck it down to a smaller caliber, that excess brass bunches up in the neck. It creates a tension band, what some people call a doughnut of brass in the neck, which has a negative effect on loading, bullet release and accuracy.

A trait of cartridge brass is that it work-hardens – which is to say the brass gets harder each time you “work it.” So the effect of necking down a casing which has been properly annealed, is that after you “work” it, it is no longer properly annealed.

Finally, necking a larger caliber into a smaller one results in neck walls that are too thick. The ideal neck wall thickness for a case the size of .22 Creedmoor is .0143 to .0148. Necking down results in neck walls thicker than that. But the Peterson .22 Creedmoors all fall within that ideal spec.

Peterson worked with Derrick Ratliff of Horizon Firearms on the particulars of the casing. Horizon has been chambering guns in .22 Creedmoor since 2014. Horizon has been a pioneer in helping move the .22 Crd. from an unknown wildcat to the popular caliber it is today.

There is a new website coming online soon dedicated to all things .22 Creedmoor at

About Peterson Cartridge

Peterson Cartridge is a family-owned, American manufacturer of match-grade brass rifle casings that are among the most precise and consistent on the market, delivering discerning long-distance shooters sub-MOA accuracy and more reloads per casing than the industry average. For more information on Peterson Cartridge or to purchase its match-grade brass casings, visit

Product Details
1 Item

Data sheet

.22 Creedmoor
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