45 ACP small primer bass

[MT Pockets]

Having a friend who is a Deputy in a nearby town; I was given quite a large amount of mainly 45acp brass. I letteraly have more than I will ever shoot. Most of it is Remington and Speer by a large margine. Of the Speer most have large primer pockets but about 200 rounds are small primer pockets. I shoot mainly revolvers and have never run across this and have to wonder if my load data that I use needs to be adjusted for these rounds? As I stated I have more once-fired rounds for the 45acp (2500+) if I trashed them it would not break my heart. I am curious as to why they were made and what can be done with them?

 

[Alaska]

I have had excellent results with Longshot and 45 ACP Fed Nickle Small Primer Pocket brass using CCI Small Pistol Mag Primers using 45 Super handloads of 250gr. Brass performed excellent in G21 with 4.6” KKM and 5.2” KKM

 

[jimbires]

I would guess the small primer brass would take higher PSI better than the larger primer brass . maybe these are from +P ammo ?