Can anyone give me an idea about how much of a pressure increase to expect when using magnum large pistol primers instead of regular large pistol primers.
I had some rounds of 44 mag. that I had loaded with 280 grain Berrys plated flat nose bullets, 20 grains of IMR4227, Starline brass, and CCI 350 magnum large pistol primers. I was shooting this in a model 92 trapper. These loads seemed a little stout but not too bad. When I checked the brass, the primers were flattened.
The max load for this cartridge combination is 22 grains while using LP primers.
My question is could the magnum primers have caused enough of an increase in pressure to flatten the primers? I was still 2 grains shy of max when this occurred and if I switch to LP primers should this allow me to move on up without excessive pressure?
I intend to test this out by moving in small increments and small batches until I find something I like without to much pressure. I am not going for max, but I will be using this for hogs. I also don't have access to a chronograph at this time.
Any help would be appreciated.