Ijust got a brand new Winchester Laredo in 7 mag with the Boss sytym on it . I was thinkin about trying the Berger or JLK 180 grnr in it . The twist is 1-9 I think and the barrel is 24 so what powder for this weight RX 25, H-1000, IMR 7828? what do you think will the bullet stabilize in this twist and what do you think velocity wise out of a 24" tube with the 180's....2800, 2900? or do you think i should just try the 168 Sierra matchkings and be happy with that? going to try to get a groundhog at 1500 or so this year so the 7 i think should be ok...do you agree??