You are probably blowing half the powder out on the ground, You only need 1800fps to get jacketed bullets to expand so just look for the most accurate load,
Just checked the Hornady manual 7mm08 in a 15" T/C 4064 gives the highest velocity with 139 gr and 162 gr max loads 42.3 and 39.5 and 43.0 with 120gr
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