Therein lies a problem. I haven't researched it much but I'd look for the fastest twist factory 243 you can find. One benefit to the factory 6creed is that I believe it comes stock with a faster twist which stabilized the popular 100gr class even though case capacity is close. Plenty of info on here and the googlenet. However you will do fine for your application with almost any 243, just make sure you align your bullets with your twist. I just google "what bullets can I shoot with a 243 and 1:9.5 twist" for example. That's just what I'd do, but I really have no experience besides being a basement internet research fiend.Well with what has been said by multiple people and the great advice ill be converting to the darkside haha im sure i have some 243 cartridges laying around somewhere and im looking to do some long range shooting in the near future what twist would you recommend for a 243 and should i invest in getting a custom made one or leave that for the big boys in the .30 odd calibers?