Tune for 21gr pellet and a 21 gr slug??

Anyone expierenced with one tune on a AG for slugs and the same weight pellet? Thinking of trying the AEA 21 gr pellet and the javlin 21 gr slug. Lots of variables I know but if both are accurate with out adjustment it my be a way to cheat the wind . I will be shooting a M4 Impact in 22 out to 100 yards.
Thanks
I've found the AEA 21.9gr pellets to shoot great from 800-960fps, I personally was shooting the pellets at 935-940fps and shooting slugs with the same tune and had great accuracy out of both, and this is out of my M3.
 
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