Any Advantage to Using Small Primer 45 Auto?

[Dudedog]

jmorris makes such neat stuff!!!

 

[Kaldor]

I've seen no difference in accuracy between the 2. I do see slightly lower velocity out of the SP, 25-30fps. I mainly shoot the LP but keep the SP separate for cases when I'm low or out of LP. If you shoot 9mm or other caliber that use the SP it makes thing simpler on maintaining inventory levels. And you don't have to change your press over if you press prime. If your loading on a AP it's crucial that you keep the brass sorted. They can sure break you work flow when one slips through.

This is it in a nutshell. For the guys that are chasing power factor this is a big deal. If 5gr of powder yields 900fps with SPP, and 930fps with LPP, then the recoil with the LPPs will be less with a net velocity gain. Very useful in gun games.

For guys like me, I dont care. I use LPP because I have thousands of the cases. I set aside all my SPP 45 brass for a "someday" project.

 

[d'Artagnan]

Taking into account a lower muzzle velocity with small pistol primers, I added .2gr more powder to those cases and ran the test again. There was a small increase in accuracy compared to large pistol primed cases, which isn't surprising considering the large pistol primers group was SO AWFUL. Best I could do was hit the bullseye 50% of the time. With Winchester White Box or my normal reloads I hit the bullseye 80% of the time with the rest in the next ring out. So hdwhit: I am serious and you'll be getting a PM.

 

[crackshot258]

I ask because I've hundreds of SPEER, BLAZER, and Speer-made (dot) FEDERAL (dot) 45 Auto cases. We endlessly discuss if it matters but I don't recall if anybody found an advantage to using small primer 45 Auto. In my own comparison of BLAZER small primer against (dot) FEDERAL (dot) large primer cases with the appropriate CCI primers, but all else being the same, my reloads showed no discernible difference in accuracy. Unless there is some advantage to using small primer cases, they are going into the recycle bucket.

I have had better feeding of a wheel gun with the small primer 45ACP versions.

 

[Toprudder]

I finally got around to testing True Blue powder. After finishing my load workup using large primers, I decided to run a test with large vs small primers at the min charge.

RMR 200 RN plated bullets seated 1.245". True Blue 7.0gn. 10 shots each group. Shot from a Witness 45, 4.5" barrel.

Win small pistol primers. Mix of Blazer and Federal brass.
786.4fps, 10.3 sd, 27 spread.

Win large pistol primers. Speer brass.
832.0fps, 6.8 sd, 17 spread.

And since I am trying to use up a bunch of Remington small rifle primers I got really cheap, I ran a test of those also.

Rem 6.5 primers.
809.1fps, 12.8 sd, 47 spread.

I did not notice a significant difference in accuracy at 10 yards.

 

[straightShot]

I would say NO! Toss them! They infiltrate buckets full of large pistol primer brass and mess up a good reloading routine as large primers are smashed trying to fit into small primer pockets. Cursing soon follows, and it's not a good feeling!

 

[jmorris]

large primers are smashed trying to fit into small primer pockets.

It would seem that small primer brass would be preferred then. If you plan on loading small primer brass and have small primers to go back in the brass, none would be smashed if you let a large primer pocket brass slip by your sorting process.

 

[greyling22]

Maybe, we could get every one to only use small primers in .45ACP. That would be the ideal solution to this.

This is the future. You can try and fight it, but it's going to happen. If it shot 45 still I would be really annoyed by it though.

 

[tommy.duncan]

I use my spp 45 cases for 400 cor-bon conversion loading.