Small pistol and small rifle primers share identical outer dimensions (0.175" diameter), but differ fundamentally in cup thickness and explosive brisance. Rifle primers feature harder, thicker cups to withstand extreme high-pressure rifle cartridges and prevent slam-fires in semi-autos, whereas pistol primers feature softer cups for reliable handgun ignition.
Small rifle and small pistol primers are generally not interchangeable. While they share the same external diameter (0.175"), they differ significantly in their intended use, pressure tolerances, and physical dimensions.
Comparatively, the rifle primer's cup is thicker than the pistol primer. This is because rifle cartridges have higher pressures. Rifle primers can load in pistol casings with the same primer pocket size and vice versa. They achieve this with hardly any noticeable changes.
I. General not a great idea, in rifle cartridges you risk rupturing the primer because of the thinner cup of pistol primers. In reverse (ie rifle primers in pistol ammo) some handguns firing pins don't generate enough force to set off the rifle primer.
Small rifle primers (SRP) are predominantly used in high-pressure, small-to-medium capacity cartridges. While primarily designed for .22 caliber rounds, modern precision and competitive shooting have led to their adoption in several larger calibers as well.
The CCI No. 34 primer below is a magnum primer and it can increase the chamber pressure up to 2,600 psi over a standard primer.
9mm cartridges require Small Pistol Primers (SPP). Large pistol primers will not fit because 9mm brass is designed for the smaller 0.175-inch diameter primer cup.
There are three types of primer paint: oil, latex, and shellac.
Primers are generally pretty stable at -20C for years. Some sources of potential degradation would be repeated freeze/thaw and people improperly handling and introducing nucleases.
Small pistol and rifle primers utilize a cup 0.175" in diameter, while large pistol and rifle primers measure 0.210" across. Large rifle primers are 0.008" thicker than a large pistol primer.
CCI Large Pistol Primers #300 Box of 1000
$85.95.
The choice between a large (LRP) and small rifle primer (SRP) for the .308 Winchester depends on your specific brass and shooting style. Standard .308 cases use large primers, while specialized "Palma" match brass (like Lapua) uses small primers.
The "best" small pistol primer depends on your handgun's action and reloading setup. Overall top choices are CCI 500 for hard cups and reliability, Federal GM100M for competition, and Winchester WSP for clean, consistent ignition.
A proven performer, CCI® Standard Small Pistol Primers deliver trustworthy performance for home reloaders. Easier to seat than older-style primers, CCI standard primers feed more smoothly in today's progressive and automated loading equipment.
When probably stored, they can last decades. I have personally used primers that were at least 30 years old with no issues.
It is not recommended to use expired makeup primer. Once expired, the formula breaks down, increasing your risk of skin irritation, clogged pores, and bacterial breakouts.
Yes, rifle primers can go bad, but if stored properly in a cool, dry, and climate-controlled environment, they can last for decades (often 30 to 50+ years).
How long primers can be stored at room temperature depends significantly on their state.
Boxer Versus Barden Primers
Most shooters in the US prefer the Boxer design for the following reasons: Boxer primers come in fewer sizes than Barden primers, which simplifies the reloading process. The Boxer design avoids the danger of wearing out the anvil, an inherent risk when reloading Barden-type rounds.
The best primer to use depends entirely on your skin type and your primary makeup goal. To help you choose, consider these top-tier options tailored to specific needs:
For the smoothest, most even paint job, it's important to select the right primer for the job. A good primer also ensures that your topcoat will last longer. Choose the best primer for your surface including new or painted wood, drywall, masonry, stucco, metal, dark-painted surfaces, tile and more.
You can use Small Rifle Primers (SRP) instead of Small Pistol Primers (SPP), but it comes with significant caveats. While they are dimensionally identical in diameter and height, they are not exact functional equivalents.
Most 9mm concealed carry enthusiasts recommend a 124 to 147 grain bullet for self-defense. I'm confident carrying a weight in the middle of that range. The most important consideration for choosing self-defense ammo is not necessarily the weight, but the design of the bullet itself.
Federal is regarded as the “softest” or most sensitive. Cci is definitely one of the hardest. This is based on primers sold to consumers for reloading. I tried federal syntech with a gun that set off hand loaded federal consistently and I could not get it to go on the factory ammo more than 3 times in 4.