You don't have to fuss too much. Its a very forgiving case.
2206, 2208, W760, H414, R17, CFE223 have all worked for me over the years.
120 Sierra, 120 Nosler BT, 130 Speer, 140SST, 140 Nosler BT, 140 Interlock, 140 Berger have all performed pretty much within the same sort of envelope.
I don't have a particular favourite amongst those combos. Have used the 120 Nosler BT the most.
Currently using 140 SST and R17 for a solid 2800 fps from a 18" barrelled A7. Shoots bug holes. Kills 'em good.
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