10mm SPP

[therognp]

Has there ever been a SPP case for the 10mm. With the volume of powder it would seem that a small pistol oe even a small rifle primer might show some advantages. One such being a stronger case head. I notice that some cases when fired multiple times start to smear the stampings-obvious signs of head change, some part due to sliding wear and some due to brass flow. A 556 rated primer would not be the best choice but there are "softer" primers like Federal 205 and Remi 6 1/2.

[The_Shadow]

Yes they do have some SPP 10mm brass that were made for the SPP (NT) non toxic primers as contracts for LE indoor use.
Yes with the 10mm being the higher pressure cartridge it gets slammed against the breech face fairly hard!  That tends to hammer the head and brass can show the imprint of the breech tooling.
Also due to the higher velocity slide speeds the case rims do get banged up being pulled back and the the ejector strike can also leave marks as well.
Then the next feeding cartridge rims and case heads sliding up the breech face gets slammed into battery...
The small rifle primers are the same physical size as the small pistol primers.  There have been many people that have used them in various pistol cartridges.

[jmm701]

Yeah i have quite a few.  The ones I have and use are blazer brass.

[CtYankee]

Federal 10mm uses SPP. And since jmm701 reports the same for Blazer, I expect all Vista Outdoors ammo (Speer, CCI, and in the future maybe Remington) also use SPP. I have not found a significant difference in velocity between large and small primers, at least at moderate velocities.

[therognp]

I would think a SPMP would be similar to a standard LPP.mThe max of 13 gr of powder is far less than the 19-20 gr used in some loadings of 357 mag.

[bigboredad]

I've been finding small primer pockets on some cci  blazer brass

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[blaster]

a few weeks ago I experimented with loading a bunch of 9mm with small rifle primers. (I have around 7000 sm. rifle primers and 400 sm. pistol primers on hand) I shot them out of 5 different 9mm pistols. two of which were striker fired. they shot 100% reliable out of all the pistols. no misfires or light primer strikes. I didn't chronograph them but they sounded, felt and hit the same as the ammo loaded with the sm. pistol primers. I used to load my .223 powerhead ammo with sm. pistol primers hoping to get easier ignition as .223 power heads are notorious for not going off unless they hit a hard or bony part of a fish's head. seems I was just pissing in the wind. the sm. rifle primers don't seem to have any harder primer cup that the pistol primers. at least not enough to make a difference.

[The Fox]

Yeah i have quite a few.  The ones I have and use are blazer brass.

Same.

[Fatelvis]

a few weeks ago I experimented with loading a bunch of 9mm with small rifle primers. (I have around 7000 sm. rifle primers and 400 sm. pistol primers on hand) I shot them out of 5 different 9mm pistols. two of which were striker fired. they shot 100% reliable out of all the pistols. no misfires or light primer strikes. I didn't chronograph them but they sounded, felt and hit the same as the ammo loaded with the sm. pistol primers. I used to load my .223 powerhead ammo with sm. pistol primers hoping to get easier ignition as .223 power heads are notorious for not going off unless they hit a hard or bony part of a fish's head. seems I was just pissing in the wind. the sm. rifle primers don't seem to have any harder primer cup that the pistol primers. at least not enough to make a difference.

I also substituted SP primers with SR primers in my 9mm loads, and chronographed them. There was no appreciative difference between the two concerning velocities.