Yeah, you can cause gas "leaks" in about any action with the wrong ammo.
When I was living in Lander, Wyoming in the 1970's, the then-governor of the state blew up a Weatherby Mark V, which is pretty tough to do. He was taking part in the annual One-Shot Antelope Hunt with a .270 Weatherby Magnum, and chambered a .270 Winchester round. It blew the rifle apart in several ways, and injured him some. I don't think any action will stand up to a dumb-ass combination like that. The correct head-size at least minimizes gas leaks, but there's virtually nothing stopping the hot gas when it can go around a smaller case.
JB,
I saw a .270 win fired in a 7MM Rem Mag. Rifle was a 700.
Shooter got plenty of gas and a few particles that drew a little blood. Rifle was fine and is still in use.
Had a chrono set up and the bullet was going 1900 fps if my memory is correct. Probably a very good thing that the bullet was .007 smaller than the bore and that kept pressures lower than might have happened if the bullet fit the barrel.
A kid and his dad learned to keep ammo separate and only one type on the bench.
John Burns
I have all the sources. They can't stop the signal.
