I put a .338 win mag barrel on a prohunter for elk. Scope mount is an encore base (one piece aluminum) and steel rings with Leopold scope. Gun sights in easily to 1-1.5" three shot groups at 200 yards using factory ammo. The problem is that the recoil breaks all of the fasteners in the scope rings,base, forearm and stock loose. Locktited everything and resighted. Now after about 10 rounds it starts throwing flyers-- all over the target a good 6"-10" north, south, east and west. Assuming it was me. I put the gun away for a few days. Shooting again, it is doing the same thing. Fasteners are holding. I thought maybe the recoil damaged the scope, so I put a brand new burris on it. Gun sighted in fine, but after some more shooting, it is doing the same thing. Could it be that the aluminum base is twisting? Here's the kicker -- my buddy started out with the exact same setup and was at the range with me everytime I shot the .338 and his gun did the exact same thing. He sent his Leopold back to the factory and they replaced it even though they could confirm no issues with the scope (great customer service). I put my Leopold on a different rifle and it is working fine. Help! I'm at wits end with this setup. It is the most pleasant gun to shoot, but this has got to stop.