Remington 710
I have sold a few 270 Remington 710's for friends but I never shot one.
I was at a buddys place one day and a guy showed up looking for a new rifle because he blew up his 710. We looked at it and I believe it's one tough gun. The guy put a 308 in the 270 nad fired it, and it welded the lugs to the barrel. It fired the bullet down the barrrel and the gunsmith had to cut the receiver, bolt, & barrel just to get it apart. Now if that's tough, I don't know if many guns could stay together with a heavy bullet like 168 or 180 gr 308 through a 270 and not seriously threaten your life.
I dislike the look, feel and construction of the gun, but the lockup must be incredible. The only thing left from the blow up was the stock, and maybe the mag, every thing else was scrap.