I love mine, an FN action Sako...Has one standing, one folding and 3-position safety, and is spooky accurate. I get on average around 120 FPS more velocity with it over my Pre-64 Mdl 70 375 H&H. You can shoot 375 H&H ammo in it, and it fire forms to the Wby round. I find the necks tend to be a tad shorter than the Wby factory brass, however.
What I hit with either doesn't know there is any difference.