Funny you mention that. I was just shooting a Chilean carbine with 139 gr and it was keyholing big time. My bud was convinced that it's not a 7mm anymore but I think it has to be- there are no .30 or 7.62 markings anywhere and a 308 projectile doesn't come close to fitting the muzzle. The load was just wrong for the gun.
I'm ordering some of that Samco stuff. I'm curious to see how it shoots. Thanks for the tip.