Quote Originally Posted by cysoto View Post
I have only seen it tested with 142 grainers and it was piercing primers left and right.
That shooter learned his lesson. He was trying to use the same powder charge from his bolt gun ammo to his semi ammo.

One caliber + two different guns = two different loads.

I have a semi (LaRue OBR) in 260. 123s on top of H4350 is perfect. I tried 139/ and you have to seat them so deep you end up eating up all your powder space.