Well, hmmmmmm,
In my br days 5 shot groups were the test of the complete system once the load was selected.  By system I mean me and all of the stuff around or touching.
Now I'm down to 3 shot groups for my paper/hunting rifles.  When I'm "on" I get a group in the 1s, did that once.  Also once I got a 2s group.   Both 3 shots.  I just couldn't stand the mental pressure that goes with attempting to put 4 and 5 in there.
Most groups run in the 5s/6s/7s for 3 shots when I'm really trying. 
What I'm gonna try next is 1 shot at a time over a period of days at no closer than 200 yds at paper.  This would give me a better feel for how the 'system' is working.
W/the 375 Win, 1 shot groups are manditory.  Thus all my groups with that one are in the 3s.
 
Guess I best get with the varmint hunting or Evan03 will have 'em all dead.