Looks like someone should register in their local match and get their name on the club's wall for low aggregate! Make sure you take some cash with you when you go, just in case it does not work out as planned.

A good heavy barrel will produce better aggregates that a good light barrel, all else being equal.

Sporter rifles can and do often shoot an occasional great 3 shot group. That is terrific for hunting. Glad you have a nice rifle.