Advice for using large pistol magnum primers for .45 acp instead of normal should i reduce the load? If so how much? I have bullseye and ramshot zip.

[DucNutz]

I’ve done tests with rifle loads on magnum primers with pressure and velocity and not noticed much. I think one load netted around 15fps faster. I would start out at the book minimum. But I would also use a chrono to check your speed. In my experience I don’t see a lot of pressure signs in my pistol loads. I think checking with a chrono is pretty vital. I have some fast loads that are above book that don’t show obvious pressure signs. I don’t think the magnum primer will make much of a difference, but I would start low.

[mdram4x4]

start low, work up a load, watch the crono numbers and pressure signs

[Chairman–Meows]

You should be fine. if you notice with Winchester Large Pistol Primers, they say for normal and magnum loads.

[PirateRob007]

Work them up like you would a non Magnum primer. As long as you aren’t shoving them into an already developed max load you will be okay.

[Nonothinghoss]

I was always told to take the load down 10% and work up from there. In practice I have not noticed much difference over regular SPP with 45. Maybe down a tenth a grain if that. I have loaded thousands with large magnum as that has been easier to get over the last 2years