I am starting to reload for my new rife a 300 win mag. I put a Nikon buckmaster scope on it with BDC. Assuming the scope is shipped with its adjustments centered vertically and horizontally I sighted in with 180 federal sp ammo. It was hitting about 8 inches high so I end up moving the scope down that 8 inches to get it sighted in. Today I shot my first reloads through it which was 180gr. Sierra GK with 72 and 73 gr H4831sc. They hit about 8 inches low and and inch left from where the factory ammo sighted in at. I know this is probably a stupid question but can anyone tell me why this is? Is the velocity that much lower causing impact low that much? Also I shot 2 groups 1 with 72 gr and 1 with the 73 gr. They all impacted the same. cutting holes. except on first group one impacted about an inch higher and on second group one impacted about an inch lower but all others were cutting holes. Could these flyers be from not being on right amount powder? If I gradually increase it and groups tighten up will it eliminate the flyers? Thanks. Trying to learn on this 300 wm. There were no pressure signs at all. No sticky bolt, no markings on headstamp, primers look good and aren't flattened or cratered. I'm thinking I will reloads next batch in 74 gr and 75 gr. Alot info I come across have used 75gr of h4831 with success in this caliber and bullet weight