I did some reloading for my .308 to try and find a 'sweet' spot. Im shooting a R700 PSS in .308 with 150gn Hornady SSTs, Federal match primers, H4895 and PRVI brass (once fired). I fired three round groups at 118 yds (thats how long our range is apparently!), starting with 43gn of power, working up at 0.5gn a time up to a MAX of 45gn.
The rifle was cleaned prior to going to the range and i fired two three shot groups of PRVI 168gn match ammo to 'foul the bore'. I waited 7 minutes between groups, although half way through i gave the barrel 15 minutes to cool as it was getting hot. As you can see from the results, it isnt grouping that well. still. I think that the groups would be tighter if fired from a cold barrel every time.
Attachment 1 is a two shot group with my .243 done on the same day, same conditions etc, just to prove that its not all the man behind the gun!
This one you can see the 168gn match ammo, giving fairly good groups, im discounting the first three shots due to the rifle being clean before starting..?
43gn shows two through the same hole, one 1'' left and 1/2 high. 44gn shows an even larger split.
43.5gn shows three rounds spread over 2'' in elevation with a little azimuth spread.. 44.5gn shows 1.5'' ish group.
I wrote 45.5gn on the target, actually 45gn. Also a 4 round group. Anyone got any ideas why it would group like that?
Im not overly happy with the results from the .308 today. i think i may go back to the range tomorrow and only do say two 3x round groups, thus eliminating barrel heat problems (even though its a varmint/heavy barrel)
Oh, and im fully aware that the rifle is shooting 1-2'' left, but i didnt want to mess around with point of aim when trying to get decent groups.