I had a Winchester 70 in 243 WSSM.

I was pretty disappointed. The rifle would only feed every other round from the magazine. The bolt acctually went right over the case and failed to catch it. The accuracy was alright, the recoil I thought was a touch less than a standard .243. There weren't as many factory offerings as there were/are for a .243 win. I sold the gun since it really didn't tickle me as pink as I would have hoped. If I had it to do again I would have bought the regular .243.