LR primers in 10mm brass

[mlk3454]

I have used small pistol primers during the last shortage when loading 9mm and .40 with no problems. I'm wondering if anyone has tried large rifle primers in their 10s? I have about 1000 LP primers left and can only get LR or LRM/LPM at this time.

[BEEMER!]

Large rifle primers are "taller" than large pistol primers so they probably would not seat correctly.  Tha cup is also thicker and could possibly cause problems with detonation.  Not a good idea in my opinion.

[sqlbullet]

Large pistol magnum would be far preferable to large rifle.  They will seat properly.  Reduce any starting load 10% and work up slowly.  Primers can make a big difference in pressure.

[The_Shadow]

Small rifle primers can be swapped for small pistol primers, however the cups are harder and you may experience a strike without ignition.

The swapping of large rifle primers is Not!  Yes, large rifle primers are taller and if used in the place of large pistol primers it could lead to possible slam-fire conditions or out of battery conditions.   Neither are good for safety or reliability.  Sorry!

[BEEMER!]

Small rifle primers can be swapped for small pistol primers, however the cups are harder and you may experience a strike without ignition.

The swapping of large rifle primers is Not!  Yes, large rifle primers are taller and if used in the place of large pistol primers it could lead to possible slam-fire conditions or out of battery conditions.   Neither are good for safety or reliability.  Sorry!

I agree.  I know guys who have done it by using a primer pocket uniforming tool to get the primers to sit flush.  They never did get them slightly recessed as they should be.

Most 10mm pistols will probably hit them hard enough to ignite, but how uniform the ignition is questionable.

[The_Shadow]

Personally, I would not trim out the bottom of the primer pocket on these high pressure 10mm rounds either...

[mlk3454]

Thanks guys. I never had an issue with SR (federal seems more sensitive to pistol strikes) in pistol brass but do have issues with WLP primers failing to ignite (often a restrike works and today had one hit 3 times without igniting). My favorite primers are CCI but during these times I'll take what I can get.

[gandog56]

That's funny, my FAVORITE LP primers are Winchester. NEVER not had one go off.

[mlk3454]

Maybe I got a bad lot but it isn't selling me on buying more of them unless they are the only option.

[DM1906]

I use LR's in some big magnums (properly modified pocket), but would never recommend it for an auto-loader or smaller cartridge.  Times would have to be a lot more "tough" before I considered it.

I have my primer brand preferences, but pickin's are slim lately.  I can't get enough favorites to keep up with the possums and gophers, let alone targets on the range.  I recently picked up 5K Wolf LPP's, and tested them yesterday.  They seated fine and ran flawlessly in 200 .45ACP.  Very consistent, and on par with WLP's on the chrono.  Side-by-side, I/we couldn't tell the difference.  Fired in a half dozen pistols, by a few experienced shooters.  They weren't any less expensive than the common brands, but they were available.

[sqlbullet]

A few years back I got a deal on some wolf primers.  I bought 2K, and wish I had purchased 20K.  THey were great.  Consistent, always went bang.

In general I stick with CCI as well.  I have used Winchester and Federal, and didn't have bad luck with them, just tend to favor CCI.

[DM1906]

Yeah.  Had I known then what I know now (words to die by), I would have bought at least 20K (each size), when they were less than 1/2 the price of common/domestic brands.  Canned up and stashed in the barn.  Hindsight is always 20/20.  One of my LGS's is able to trickle in about 500 per month, which doesn't keep up with consumption.  The oddballs I've managed to get my hands on will, hopefully, get me through the drought.  Skuttlebutt is still 9 months or better before the market stabilizes.

[REDLINE]

Yep, those rifle primers are just too tall.  Instead of being just under flush with the bottom of the case head, they protrude about .004".  I think they'ld work fine in a single shot.

I toyed with them under the same charge (12.5 grains) of AA#9 just loading and shooting one at a time in my G20 (200gr XTP, 1.260", New Starline Brass).  The difference between LP and LPM was 10-15 FPS.  The difference between LPM and LR was another 10-15 FPS.  Additional pressure amount?...I have no clue except to assume it was a minimal amount higher based on higher veloctiy.

Either way, aside from the fact they just don't seat in far enough, there's nothing magic to be gained from them except with really slow burning powders where even a max compressed load can't reach 37,500 PSI.  But even that gets us nowhere special from the standpoint there are powders at less than a max compressed load that will reach 37,500 PSI and beyond.

Bottomline is there just is no beneficial reason to use the LR primers, and in anything other than maybe a single shot platform their use is a bad practice anyway because the LR primers can't be seated below flush.

[gandog56]

I generally just buy what ever primers are cheapest. In literally hundreds of thousands of reloads I have shot, I may be able to count with the fingers of one hand the times the primers didn't work. I've used Tula, Remington, Winchester CCI, Magtech, and Wolf, that's all I can remember off the top og my head. I'm thinking maybe his fingers were oily and somehow contaminated his Winchester LP's since I LIKE that brand. I have two kinds of primers stocked up right now, Winchester and Tula. The Tula's are sometimes real tight to fit them in, but they also go bang every time.