With a scarcity of primers I recently found some Magnum large pistol primers. I have never had a reloading recipe before that ever used a magnum primer that's always been a normal primer. Does anybody know of any load data that specifies Magnum large pistol primers? It seems that what I've read in the data books that you are not to substitute Magnum primers for normal primers because it can boost the pressure.
I'm figuring I could probably use Magnum primers with target loads and not worry about pressure has anybody have any experience with this or is there any documentation anywhere? Thanks in advance for any help.

nope.
the reloaders I know just start at the bottom and work up their loads.
they get to where they are happy with the powder burn [indicating a pressure window] and accuracy then call it good.

I had to do this with .45 Colt loads. I shoot Blue Dot under a 250 hard cast lead bullet. I had to use Wolf magnum large pistol primer. I just backed off amply and worked back up. I got back to my same load and couldn’t really tell any difference.

I use Magnum LP primers in many of my handgun loads---.45 acp, .45 LC and I also use them in many of my non Hi-intensity/pressure loads----..30-30, .35 Rem, midrange loads in .30-06, 30-40, etc. with no problems. I do this because I have a s*^t load of them!

They work well and in some cases out shoot standard primers in the rifle loads.

Hip

The 38-40 is tricky to load for...What primers have some of you used in that caliber for the win mod 92 rifle? Ive used CCI 300 for many years but Im down to my last 50..std,large or small or mag rifle primers work? small pistol? what all.

I do have fed 150s LPM primers, can I use them in my win mod 92 38-40 Win..for reloading..will they fit?