.357 using Small Rifle Primers?

[possom813]

The way my logic works, if I'm loading .357 for a rifle, then I can use rifle primers, right?

The problem being, I can't find data for using SRP's.

I know they fit in the primer pocket, don't ask how, but I do [smilie=b:



I'm sure someone has tried this, any help of finding info, or what to watch out for when doing something like this?

[Goatwhiskers]

If my memory is correct, LRP and LPP are the same diameter, SRP and SPP are the same diameter, the only difference is either the thickness or maybe it's the hardness of the cup material due to possible primer flow in higher pressure situations. Theoretically you could load rifle cartridges to a somewhat higher pressure, so use of SRP would be OK. In my Max since I use heavy charges of A-1680 I use SR magnum primers. Works for me! GW

[dragon813gt]

All I use is SRP for 357. Unless you are working at max just use the data in the book. SRP and SPM are virtually the same. The only difference being the cup is harder on the SRP. Just as a disclaimer this is what I do and have had acceptable results.

To clarify, I use the SRP w/ H110. For powders that don't call for SPM I stick to regular SPP.


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[nhrifle]

SRPs will seat correctly in .357 cases? Someone once suggested I try small pistol primers in .223 cases to wring a little more accuracy from the load and I remember they seated well below flush, and I had several pierced primers. These results would lead me to believe that SRPs loaded in pistol cases would be above the rim unless seated with excessive force, which would possibly lead to cracking of the priming compound and potential misfires, or worse, detonation of the primer while seating, and possibly light primer strikes.

[fecmech]

I use CCI SR primers when I use 296/H110 powder in the .357. I get my best accuracy and low sd's using that combo.

Physical dimensions of sp and sr primers are identical. LP primers are not as tall as LR primers.

[DCM]

SP & SR primers are the same size wise so fit is not an issue.

As others have mentioned the thickness/hardness of the cup IS different.
This may bring about issues with soft hits from firing pins.
This will be an issue if you use the primer as your pressure indicator as it will not show signs that a pistol primer will as it is designed for much higher pressures of rifle cases,
This is why they recommend using SR primers in the 5.7X 28 as the pressures can be much higher than with most pistol rounds.

It is best to use some type of pressure trace system to re-develop loads with the SR primers as it will definitely change things and it will be more difficult to tell what has changed pressure wise.

Can it be done yes.
has it been done yes.
Please be careful.

[dragon813gt]

Physical dimensions of sp and sr primers are identical. LP primers are not as tall as LR primers.

This. I use mainly CCI SRP but have had no issues w/ Remington 6 1/2s as well.




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[rockrat]

I use Rem 7 1/2 primers in my 357max rifle and same with my pistol too. I also use sr primers in my 357mags when shooting in a rifle.

[MT Gianni]

I have used SR primers in a blackhawk only load that i got off the net in the late 90"s. It went bang every time. I have reduced those since then.

[runfiverun]

the 357 max case is designed for the sr primers.
most all the elgin gates designs use rifle primers.
i use sr primers in a few handgun loads and in other cases like the 30 carbine and 25-20 i use sr magnum primers.
yeah odd, the smaller cases and a much hotter primer. works though.

[shotman4]

the only place a SRP dont work is in a "striker type hand gun" like glock, taurus etc . I most times drop 1 gr powder
The SRM primer makes a heck of a load for Gluelets in a scholfield case. in a 45. It will put them through paneling

[runfiverun]

in a 30 carbine revolver it will put one through the garage door [siigh]
and crack the headlight lense on the wifes car behind it too.

[fecmech]

Back when the last crisis caused primer shortages I was caught with low stock of SP primers so I bought 5K of CCI SR primers. At the time I was using Mag Tech primers in my loads so I subbed CCI SR to see what the difference was. The following data was 10 shot strings over an Oehler chrono Rossi 92 20" bbl.
Load #1. 5.1/ Unique/158 TLSWC/ Mag TechSP. Velocity was 1066fps, ES=44 fps,SD=12 FPS.

5.1/Unique/158TLSWC/CCI SR. Velocity was 1079 fps,ES=88fps,SD=25 fps.

Load#2 14.9/wc820/358429/Mag Tech SP. Velocity was 1662 fps,ES=49,SD=15

14.9/wc820/358429/CCISR. Velocity was 1667,ES=24, SD=6

While the Unique load with the SR's was less uniform accuracy to 100 yds was the same. The wc820 load withSR's was more accurate and very uniform. After these two tests I just used the CCI's in my other loads when I ran out of MT's and never had a problem. The CCI SR primer is now my goto primer with 296/H110/wc820 in the .357.

[firefly1957]

As always when you switch primers work your load back up from a reduced point . I have used small rifle primers in pistol cases with no problems other then in a revolver with a tuned trigger i needed a stronger spring for 100% reliability. I was shooting plastic bullets and they did seem to go faster than with magnum pistol primers.