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Modify 45ACP brass for LRP

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Modify 45ACP brass for LRP Empty Modify 45ACP brass for LRP

Post by 1983xr Tue Sep 07, 2021 6:32 am

I have a bunch of large rifle primers and few of large pistol primers. Has anyone cut primer pockets for LRP and had good results? My load is 4.2 of Bullseye with a 185.

Thanks
Brad

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Post by dannyd93140 Tue Sep 07, 2021 8:46 am

I used large rifle without modifying the primer pockets; worked okay.  Also used them in 38/357 after modifying the primer pockets; with good results.
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Post by SteveT Tue Sep 07, 2021 9:18 am

Large Rifle Primers are taller than Large Pistol Primers. Large Pistol Primer Pocket depth is 0.117 - 0.123" and Large Rifle Primer height is 0.123 - 0.133". The Rifle Primers will stick up above the base of the cartridge so there is a risk of the gun going full auto due to slam fires.

Rifle primers are usually harder and/or thicker brass so they are less likely to be ignited by lighter primer strikes. If you have a worn out firing pin spring or a light weight firing pin this could be a problem.

I did a test a few years ago during the last primer shortage and I did not experience any problems, but it was only a few rounds.

If you use a primer pocket cutter to make the pockets deeper it would be safe, but you could experience mis-fires using pistol primers if your firing pin doesn't protrude far enough. This would be a safe condition, but not good.

Small Rifle and Small Pistol primers are the same size, but pistol primers may be too soft for high rifle pressures and could burst and rifle primers are usually a little hotter, so the pressure and velocity will usually be higher if you use them in a pistol load.
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Post by bruce martindale Tue Sep 07, 2021 10:08 am

If you mill the pocket deeper to accommodate a LRP, be aware that you are reducing the web thickness in the pocket.

Measure it with a plug in the case and one in the pocket. You may not have a lot of margin. 

Commercial Federal 223 from pre LC contract days was already half of milspec henc loose primers and blowouts.

Not sure how serious the 45 failure would be.

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Post by bruce martindale Tue Sep 07, 2021 10:08 am

Find someone local to trade with maybe?

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Post by flyer898 Tue Sep 07, 2021 10:35 am

I think it makes more sense to spend whatever is needed to buy LPP - even if you have to substitute brands, you will be out less time and likely have a better product.

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Post by BE Mike Wed Sep 08, 2021 10:23 am

Spitballing here. What about cutting .30-06 cases to .45 ACP length?
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Post by Allgoodhits Wed Sep 08, 2021 7:31 pm

1983xr wrote:I have a bunch of large rifle primers and few of large pistol primers. Has anyone cut primer pockets for LRP and had good results? My load is 4.2 of Bullseye with a 185.

Thanks
Brad
I have loaded at least 10,000 WLR primers in .45 ACP with no issues. Primer pockets were not altered. Cleaned, not altered. Most of the brass was Federal. Not sure what I did right or wrong, but they worked fine in my 1911's.  FYI loaded on a Dillon S1050.
YRMV.
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Post by dannyd93140 Wed Sep 08, 2021 7:53 pm

BE Mike wrote:Spitballing here. What about cutting .30-06 cases to .45 ACP length?
308 Winchester works better
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Post by dannyd93140 Wed Sep 08, 2021 7:57 pm

Data WLR SW625 Sw 45acp 200 Swc Hp38 5.2 WLR
NotesImported from Chronograph, String 5, on 6/12/21 9:22 AM
Number of Shots10
Extreme Spread147
Average817
Standard Deviation35
Power Factor Average163
Power Factor Low146
Power Factor High175

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Post by BE Mike Thu Sep 09, 2021 9:23 am

dannyd93140 wrote:
BE Mike wrote:Spitballing here. What about cutting .30-06 cases to .45 ACP length?
308 Winchester works better
.308 brass certainly would be easier to find, especially once fired. Even brass from blank rounds would work, if boxer primed, I suppose.
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