Large rifle primers used for .45LC .. Good or bad?
- Thread starter Brianma65
- Start date
might be ok if your hammer gets a good WHACK at the primer-only difference is the cup is somewhat thicker on the rifle primer, depending on the manufacturer and sometimes like Winchester there is no difference- the MAGNUM primers MAY burn a little hotter and are more suited to adverse conditions- that's all u need to know on primers.-
Industry standard LP primers have a shorter cup than LR primers. Apart from not being intended for rifle pressures, a LP primer will seat too deep in a rifle case, contributing to misfires while a LR primer will stand proud in a pistol case. A protruding primer is not a good idea.
small rifle and small pistol is one thing. LARGE rifle and large pistol are not the same size. IF they fit and if they go bang in your gun well OK but do not try full maximum loads with these hotter primers. Advise; just buy the right primers and sell of what you can not use.
fingers284
CGN Ultra frequent flyer
- Location
- Alberta Cowboy Ranges
Just read an article stating that "most serious BPCR long range competitors use pistol primers in their BP cartridges" but those dudes would use warm mothers milk for bullet lube if it were rumored to help a bullet "squirt" from the barrel better...
I agree on the protruding primer not a good thing, the recoil plate/rear cylinder gap on most revolvers is a tight fit and would hang the cylinder up at every round. The most common "stage stopper" at a Cowboy Match is an almost unnoticeable high primer in a SA pistol.
I've loaded and fired .44 mag with LRP's before just to test and see. The primers sat significantly proud of the case heads. I single-fed them into a lever rifle. I was extra gentle when chambering but didn't notice anything abnormal feeling. It worked, all the rounds went bang, but I have no plans to do it intentionally again.
In a revolver cylinder they'd likely jam the cylinder from rotating because the primers stick out so far.
There is a chance they may cause a magazine/cylinder detonation under recoil if in a tube mag or more than one is loaded into a revolver. I'd hardly call it a guarantee and certain firearms may be able to shoot indefinitely with significantly proud primers without a detonation but it's an easily avoided, pointless risk no matter how small.
If the primer pockets were deepened with a uniforming tool to rifle specs, and the hammer was known to be strong enough to set off a rifle primer, there would be no risk but then you need to carefully segregate your brass which is tedious and not worth the effort.
In a revolver cylinder they'd likely jam the cylinder from rotating because the primers stick out so far.
There is a chance they may cause a magazine/cylinder detonation under recoil if in a tube mag or more than one is loaded into a revolver. I'd hardly call it a guarantee and certain firearms may be able to shoot indefinitely with significantly proud primers without a detonation but it's an easily avoided, pointless risk no matter how small.
If the primer pockets were deepened with a uniforming tool to rifle specs, and the hammer was known to be strong enough to set off a rifle primer, there would be no risk but then you need to carefully segregate your brass which is tedious and not worth the effort.
. LPR is 0.122. LRP is 0.128. MRP is 0.134. Oh no cheap LPP for me.fingers284
CGN Ultra frequent flyer
- Location
- Alberta Cowboy Ranges
Yes and to take it a bit further, the conventional thinking is that the "softer" ignition of the LP primer doesn't "jump" the bullet into the lands (creating the proverbial "space" between bullet and powder that is much frowned upon in that game) before the powder pressure hits it. LRP have long been accused of starting bullets on their journey before the powder ignites to its full force, more common result is poor bullet obturation/inconsistent accuracy and in extreme cases, bulged barrels.
