Good cartridge, entry level rifle that wasn’t made for long. Not sure what kind of aftermarket support there is for it because they just weren’t made for long. What’s the bolt look like?
.243 is a legitimate cartridge but it is a bit of a hot rod, usually pushing small 6 mm bullets (75-90 grains) over 3100 FPS. 1:11” twist so unless it’s rebarrelled you can’t take advantage of the bigger bullets. If you don’t know how much it has been shot it would be good to have the barrel scoped, just to see. 2500 rounds is about max barrel life but each rifle, the way it was treated, and what you expect from it can change that number.
Lots of animals killed with .243, some tend to think it’s a pip-squeak because it’s popular for kids. Don’t be fooled, a .308 case pushing a .243 bullet makes for a very viable small-medium game rifle. With a 1:7” twist barrel to shoot 108 Sierra match Kings or 115 DTACS (or any other heavy, high ballistic coefficient 6mm bullet) it will shoot targets out past a mile.
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