Im also using the 165 Gameking and 2206H. 42gr gets me 2600 from a cut down 16" Parkerhale TX1200 (Mauser 98 action). I tested up to 43.5gr and was getting FLAT primers in cold (5c) weather, a load like this would be way overpressure at 25c. I have tested the 42gr load in very hot weather with little to no pressure signs.
Im using PMC brass and CCI BR2 LR primers.
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