Hi Feebz,
Good post mate, and some really good info to read. Have a 280 AI as well. Was a Tikka 708 so barrel is 22". From memory running 55.5gr of 2209 on 150gr LRAB. This was 1gn over book max. Gives about 2835fps. Has claimed one victim at about 325yds and was good clean boom flop! Have some heavier projectiles and 2213sc loaded up to have a go with. Once have had time to do this will report back.
Cheers,
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