Was at the range this morning checking my zero before moose season and the guy next to me was doing the same. He shot his 30-06 and then pulled out his 338 Win Mag. He fired a shot while I watched and I thought WOW that 338 sure don't seem to recoil much.
When he tried to eject the spend brass it failed to extract and had to be fished out by hand. He laid the fired brass on the shooting table were I could see it. It looked like a fired 45-70 case. I had left my glasses in my truck, so while I walked over to get them he fired twice more.
When I looked at the brass with my glasses I knew right away something was wrong. The case was bulged and the brass had stress marks all over it.
I ask what ammo he was shooting. He looked at the box and said 338 federal. I told him I was pretty sure that a 338 federal was a necked up 308 case.
Well, he pulled out another box of 338 Win Mag ammo and sure enough there was a huge difference in case size.
Funny thing is that 3 rounds shot a group about 1.5 inches.
So be careful out there. I have a 270WSM, 300WSM, and 325WSM all based on the same case. Because of this I am extremely careful not to mix ammo.
Be careful people.