SPP Magnum

[Rlandry]

I have several thousand Wolf Small Pistol Magnum primers and I no longer have any magnum handgun that uses them. Can they be interchanged with small rifle primers? If not I'll sell or trade them.

 

[isofahunter]

NO!!!! A friend mixed primers up one time PP for RP by accident. The first two fired fine, the third one resulted in an explosion causing damage to the gun, burns on face and hands and wounded pride. It was almost a catastrophic failure.

 

[elwarpo]

I have used them in several loads, but I worked up the loads from scratch, please do not substitute them into existing loads. I actually prefer them in cases where I have a small volume of powder to case volume. more consistent velocities. One being light 45acp (yes have some small primer brass) with 4.4 grains of titegroup.

 

[isofahunter]

I Believe the OP is asking if he can use PP in a rifle load? My answer is based on that assumption, not using RP in a pistol load.

 

[elwarpo]

I Believe the OP is asking if he can use PP in a rifle load? My answer is based on that assumption, not using RP in a pistol load.

My bad, I misread. The answer is no, the thinner metal of pistol primers will not hold up to rifle pressures.

 

[47guy]

NO!!!! A friend mixed primers up one time PP for RP by accident. The first two fired fine, the third one resulted in an explosion causing damage to the gun, burns on face and hands and wounded pride. It was almost a catastrophic failure.

so your friend use a pistol primer in a rifle load and almost blew himself up?

 

[47guy]

My bad, I misread. The answer is no, the thinner metal of pistol primers will not hold up to rifle pressures.

just curious...have you tried it to see or are you just repeating what you have read on line?

 

[elwarpo]

Actually tried. I came up with a rimless 444 marlin for an AR10. Pretty much neck out a 30-06 case to accept 44 cal (bullets). Same size as a 444 Marlin and use 444 marlin dies. I was using IMR4198 powder, I figured I could use large pistol primers (winchester). I was just under under max load using Hornady 265 grain bullets (trying for 2250 fps). Made 20 rounds and noticed 2 bulged and 1 missing primer after looking at the brass.

 

[47guy]

i do not have time right now but will get back to this a little later.

 

[isofahunter]

so your friend use a pistol primer in a rifle load and almost blew himself up?

Yes, two stage burn was our conclusion. The first curve got bullet moving and the second came along causing the mag to blow apart, broken extractor, cracked bolt head and case ruptured.
We went back over his load data and he had used PP by accident, load was mid range and proven with SRP. The only difference was the primer.

 

[MarinePMI]

The only instance I've seen of using spp in a rifle case, is the 22 Hornet. And it operates at significantly lower pressures than most modern cartridges, and has the case volume closer to a pistol cartridge.

 

[alanonb]

Have any 444 marlin brass left for sale?