Well I'm flush with SR primers and have just a few SP left. Anyone ever try to use a SR in a pistol cartridge?

Use them all the time in my Casull.

I haven't bought SP primers in years. I started using SR primers about six years ago and have had no problems.

This has been discussed before - at length.

The SEARCH function is there for a reason.

I have loaded MANY .38 and .357 cartridges with Rem 6-1/2 small rifle primers. They are just plinking rounds but they work fine.

Today I bought 4 thousand Rem 7 1/2 bench rest small rifle primers. Would there be any difference in those vs the Rem 6 1/2 primers? I never thought of using the small rifle in small pistol, and I can't find any small pistol primers locally.

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Kevin in Oregon

On first thought it would seem not to be a good idea. SR would seem to be much hotter than SP since it has more powder to ignite.
But if it works for ya'll?

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Shooting guns is good therapy

Be careful the hotter ignition will increased pressure, also rifle primers are harder and may not go off if you have a short firing pin or weak spring.

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Endowment Life Member NRA

A poster on another forum decided to test the "hotter/higher pressure" theory, as it sounded plausible. His chrono showed a whopping four (4) FPS increase going from SP to SR primers.

SR primers use thicker cups, which is what makes them harder. It is also what makes them a good choice for high pressure handgun loads, like 9x23, .38 Super and .40 S&W. It was probably the "race gun" shooters who hit on the idea, as blown primers were a common problem with their Super loads (hence the term "Super face").

Don't let the low fps increase fool you about pressure. Velocity does not blow up your gun, pressure does.

Increasing pressure does not give you more velocity. Please do some research before posting such information.

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Endowment Life Member NRA

I didn't mention it in my earlier post, but Remington 6-1/2 primers are only for the .22 Hornet, have thinner cups, and have lower pressure than other small rifle primers.

Odd - all these years I thought it was the PRESSURE of the expanding gases which created the VELOCITY of the exiting projectile.

This is not to say that the pressure CURVE is not an issue; obviously it is. A rough indicator of that is flattened primer cups, but it IS a rough indicator.

That said, I've done it for years, including compressed loads, without a ka-Boom. Naturally, ALL such experiments should be undertaken with care and by starting low and working up.

Naturally, anyone taking advice off an internet forum does so at his/her own peril and with full assumption of the risks therein.

In loading .38 Super and 9x23, I use nothing but small rifle primers, to prevent primer flow and piercing at high pressurs.

High pressure is no indicator of higher velocity. There are times where an increase in powder charge will result in lower velocities. The pressure created by Bullseye may be excessive for a certain velocity in comparison to a slower powder producing the same velocity.

However, the available energy in small pistol primers is very close to the energy available in small rifle primers.

Here's a chart of primer energies from Speer #7.

Pressure (under the curve) is related to velocity. There are limits of course, but saying pressure and velocity are unrelated is incorrect.

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It's around here somewhere!

In some cases it is required. I have always used SR primers in my 357 Maximum reloads as suggested in most loading manuals. This is especially true when using powders that are hard to ignite such as H-108, H-110 and W-296.

There is more to it than just pressure to increase velocity. Sorry we just don't agree.

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Endowment Life Member NRA

Agreed. It's probably better to say maximum pressure and velocity are not necessarily related, and it's the maximum pressure that leads to KBs.

Indeed.

Dare I mention that THIRD factor; the direct correlation between plastic and dreaded "energetic disassembly?"

This can be expressed as mathamatically as:
> % PC (Plastic Content) = > % kB.

I load nothing but small rifle primers in 40 S&W. the cup IS thicker but I can not tell any difference between wsp and wsr. I had more rifle primers so I used them . this is with light loads in a gun, kimber, with original mainspring. again, cup is thicker for higher pressure of rifle load so a weak mainspring would be a problem. do not try this with large primers.

Rifle primers are taller than pistol primers. The primer pockets are deeper in rifle cases. About 30 years ago I tried using rifle primers in 357 mag loads. The primers were sticking out enough to bind the cylinder on a stainless blackhawk revolver.

That's curious. Vitavuori calls for small rifle primers to be used with N110 for .357 mag loads. Anyone want to swap some SP for SR? 300 or so? I've got SP but can't find SR.

There is a point of diminishing returns in relationship to velocity in regards to excessive pressurization.

NO; LARGE rifle primers are taller than LARGE pistol primers. This is NOT true for small primers, for which the external dimensions are identical.

If you had primers sticking out of cases that take SMALL primers, you did something wrong.

I started to scratch my head too, when he mentioned 357 mag

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John

someone said do not try this with large primers... me. did you know when the .357 magnum first was made it had large magnum primers ? I wish it did now.

Me too - they're Sellier & Belliot - found that 1 in 20 FTF in a my much used Marlin U/L.
Maybe my Marlin needs a new spring?

DCC

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DCCUK