M91 “Calvary” Carbine for my son

[Ovidio]

Are you using the magnum LR primers mainly for use with the W760?

I use the magnum primers because they are suggested by many sources (not last by Dave Emary) and I found that with that load my old 91 long rifle shoots really well.
No sign of overpressure on the primers nor on the brass, no "wind" in the face from the pressure release gap, a nice, strong bang with good recoil, like a military round should deliver.
Everything as I'd expect it and also accurate.
I made some extreme tests with the W760, going loooooow with the load and using normal LR primers. Every now and then I got a whiff in the face, but I have the privilege of having a rifle that's been in our hands since 1932, when Grandpa won it in a national contest. And it was brand new. So, no risk of tampering, bad maintenance or other strange things.
It only shot military rounds until I happened to "intercept" it.