Do you have any pictures of the groups you refer to? When working up to the best load you want to look at vertical more than horizontal. If your groups are tall the charge is wrong but flat and wide your seating is off a little. A 3 inch wide group at 300 yards that is only 1/2 inch tall is a great group that needs the bullet seating adjusted. I hope i have made this at least as clear as mud now.
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