SS
I have both I'm about to mention.
Either the standard 243 or the 6/284.
Both with 30" barrels and having the 8 twist.
The 105 gr bullets from BOTH rifles are extremely accurate to 1000 yards and a bit further for the 6/284 because of the additional velocity that one can achieve.
The 243 would be a better choice if "many" rounds are to be fired and you want the barrel to last longer.
Later
DC