I am under the general impression that folks who build a .243 or 6mm for yotes or Eastern woodchucks use 78-87 brain bullets and folks who do it for Eastern Whitetails use 85-100 grain bullets. I am not sure if I want a .243 or a 6mm and I am also undecided on having the AI version of each, but I would like to know what twist would be optimal for a varmint/deer medium weight walking sporter. I will not use ultra high 115 etc, bullets in this gun. I have others for that. I will likely never shoot over 300 and 200 would be a more common, "long shot". What would be the twist of your choice? So far 1 in 10 seems right, but I really am in unfamilar waters with this caliber. I sure wish Lapua made 6mm Rem brass and then I would have the cartridge nailed down too. Am not sure if having better available brass for the .243 outweighs the extra capcity of the Rem. 6 Also, will a 100 grain handloaded bullet(in the 6mm Rem.) fit in a Rem 700 short action O.K. ? Seems I heard it could get tight in that regard. Any comments welcome. And if I go AI, does just buying Lapua 6.5/.284 brass and necking down make more sense and take less time than fireforming? Would that fit also as well in the 700 short action? Does anybody make a .243 in a twist like I would want from the factory? I am under the impression they don't. Also, I am not worried about accuracy life in that it will be shot maybe 50 times per year at the most.