Heyy 338, I shoot the 7mm STW. And will be building a 257 STW or better known as the 257 hot tamale. Look it up as the 257 hot tamale and you will find plenty of info to make your decission! It's a sweet round! I dropped an elk with 1 shot with my 7mm STW, which my brother, who hunts elk and lives in Col. said may not do the job!1 shot, elk drops in tracks, bullet completely passes thru withan exit hole about silver dollar size!