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DESCRIPTION

308 Winchester Match Small Rifle Primer Unprimed Rifle Brass Box of 50
by PETERSON CARTRIDGE COMPANY

Product Overview:

Recently Peterson's ballistician had some extra time in his schedule, and asked what he should work on next. They said, "Just for the heck of it, see how many times you can fire our .308s before you experience failure." So that’s what he set out to do.

He took five .308 Winchester casings out of inventory and loaded them at SAAMI max pressure, which is the pressure they use for all of our longevity testing. It is a hot load, and he did the firing out of our Universal Receiver. This way he could measure pressures and velocities each shot. He shot all five, 20 times. (It takes a long time to do that. Load five casings. Shoot five times. Back into the lab to reload, back into our indoor range to shoot, back into the lab, and so forth.)

After 20 firings with no sign of case deterioration he asked if he should keep going. They said, "Sure, let’s see how long these can go." So he shot them five more times. Same result. All casings still in good shape. Peterson told him to keep going. He shot each of them six more times. At this point each of the five casings had been fired 31 times. After several days of this the casings were still in good shape but they were experiencing "ballistician fatigue."

Finally he said, "Let me take these cases to the outdoor range and see how they do for accuracy."

For the 32nd firing they used a lighter load. The gun used was a Tikka T-3 bolt action, 20 inch barrel with a 1:11 rate of twist. He put five shots in three tight holes at 100 yards on a somewhat windy day.

After 32 firings of Peterson .308 Win the primer pockets opened about 0.001 of an inch but were still tight enough for further use. There were no cracks or signs of head separation.

Many competitive shooters prefer Small Rifle Primer pockets (SRP) because they experience longer primer pocket life due to the increased material in the head of the case. There is also a belief that Small Rifle Primers produce a more consistent ignition. Some people even report better groupings and lower velocity spreads. However, SRP are not recommended for shooting in extreme cold or hot temperatures.

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