Hi , recently had a Rem.721 rebarreled to a 30-06 . Shilen select match grade contour # 4 barrel . Have been working with various loads using 180 gr. SGK bullets and Berger 175 VLD Hunting bullets , using H4350 , IMR 4350 Reloader 22 , and IMR 4831 , powders . Have tried against the lands and .050 off the lands . All powders have given 1" to 1.75" groups except IMR 4831 Which shot .6" and .7" three shot groups . Should I expect better , or is this as good as you think it will get ? Also Is it common to have a gun that seems to shoot only one powder well ? My 243 factory Rem seems to shoot all the above powders with 100 gr SGKs .7" to 1" three shot groups . I guess I had thought the custom barell and reworked action of the 721 would shoot a lot better than the Factory rifle . All shooting being done from 100 yds and on solid bench with bull bag front rest and rabbit eared rear bag . Thanks for the ears and any advice given . Kenneth