DA small pistol primers - Interchangable?

[thatmikeguy]

My understanding, is that the primers cups between small rifle and small pistol are identical. The difference is in the charge. the small rifle primers are just a we bit hotter. My buddy and i have been using the small rifle primers in our 9mm rounds with no change vs small pistol primers. chrono speed is the same. i've also been using the small rifle primers in 40 s&w, 38 special and 357 magnum with success. No issues. i have not tried the pistol primers in rifle rounds, but if the cups are identical..... hope this helps.

[Prairie Plinker]

SP:


LP:

Attachment 72658

Well thank you very much! Didn't expect the "blueprints", haha! Going to have to Google a couple things but that pretty much clears that up.

[Figure 11]

The point I picked off this drawing that could help the non-nerds:

KVB-9 (pistol) 0.48 mm cup (~19 thou)

Standard North American primers are around 17 I think.

KVB-223 (rifle) 0.536 cup (~21 thou)

Standard primers are around 20 I think. Small rifle magnum more like 25 thou.

This explains a few things about them being slightly harder to seat and set off. I use the rifle primers in some handguns with beefy springs and they work fine. I've used many of the pistol ones in handguns with reduced springs. You just have to seat them well. Using pistol primers in 223 would scare me.

It looks like there might be more compound in the pistol primers (!)

No, I don't read Russian. I just read nerd.

[legi0n]

While reloading 223 at pretty much max loads, I've had many primers blanking (piercing) with standard small rifle primers. Magnums fared better from this point of view.
This is why I wouldn't use pistol primers. They're even thinner.

[thatmikeguy]

I used SRP in my Shadow with a reduced power hammer spring (13lb)
They worked fine. No misfires.
Looks like you guys are right about thickness. I don't think I would try the SPP in a rifle.
I know it's safe the other way around.