I'm ready to buy. I know the make and model I want, I just can't decide on caliber. I've been told (by long time shooter and club member) to buy 6NBR. The problem is, for some reason that caliber is over $200 more to buy the gun and of course the ammo is twice as expensive as .223. I will be reloading at some point but not at the beginning. I'm sure some of you have deliberated this. I guess the question is, how much more accurate is 6NBR then .223? This gun will be used solely for Groundhog matches at 100/200 yds. Thanks for replying to my rookie question. By the way I'm 72 and cost is important.