Anyone have any experience using Large magnum pistol primers in place of large pistol primers? I've heard it's not a good idea because of the increase of case pressure. The data I have is 11,400 to 16,800. Couldn't an adjustment of powder compensate for a slightly hotter ignition? If anyone has some insight on this it would be greatly appreciated. I'll be testing with 4.75 barrel. a large array of brass. 1.200" C.O.L 4..4 grs. of Hodgdon Universal (4.5 is the minimum with 5.4 the suggested maximum) Federal No. 1551 large pistol magnum primers with a 230 grn. Speer RN totally encapsulated FMJ. Thank you in advance for taking the time to respond.
Large pistol primers Magnum for 45 auto
- Thread starter Mkemblowski
- Start date
No it's not a problem, but you do have to adjust your powder charge down. I use Winchester large pistol primers which are considered magnum/borderline magnum. I get more consistent velocities with them than I did with the CCI standard large pistol and only had to adjust the powder down 1/10 of a grain.
The Federal 1551s may be a bit hotter than WLPs, so I'd start with the minimum charge and work up.
The Federal 1551s may be a bit hotter than WLPs, so I'd start with the minimum charge and work up.
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That's what I thought, How much of adjustment did you find the most consistent?
^ just start your load lower. You should be fine. I do it with small pistol magnum primers instead of SPP.
Any reason why you’re loading so short? The maximum coal is 1.275”.
My original load with CCI 300:
4.4 grains Vihtavuori N310
Zero JHP 185 gr.
COL 1.220
.469 taper crimp
Velocity from 5" bbl was 775
After switching to WLP primers, I adjusted the powder down a tenth to 4.3 grains and getting same velocity/accuracy.
And your COL seems a little short to me, too. Increasing it will also lower your pressure.
You guys are right. I was going off Hodgdon loading data and looked at my Lyman book and says the same thing you are. 1.275. Thank you very much gentlemen!
Winchesters are my favorite for this reason. I build up all my large pistol primer loads with them.
Mag primers are all I use for fine ball powder in pistols, large or small. Perfect for hs6 and silhouette.
