I have found that velocity is the key and that is of course regulated by powder, which I am not sure which you have loaded. Also not sure why the success, but I have migrated to all VV powder when possible, & the accuracy is phenomenal on Combos across the board. Now, I had to shoot quite a bit, grain by grain to find the solution but the Combo will tell you what it fancies.

Cheers,

Raimey
rse