Hey guys I just got my 300 rum sendero set up that I bought off here..Shot it for the first time tonight. I shot the remington scirocco 180gr power level 3's out of it and it just seemed to spray them at 100 yards (probably around 5 inch groups) off sand bags! I dont claim to be the best shot but def better than 5 inch groups off bags I was hoping 1 inch groups...Whats everyones take on this particular bullet-is it junk for tight groups? Are some rifles fussy and a different manufactures bullets with shoot flies off paper?? I plan of shooting Nosler custom or Barnes ttsx would these help my groups? And if so what are your experiences with factory ammo..is changing brands gonna pay off like I'm hoping??