your cheek is applying to the stock. I can usually get rid of all my horizontal inconsistency by making sure that my cheek doesn't touch the comb at all. I use a scope riser to get the scope high enough to make this possible. Also look into how you are pulling the trigger. A nice steady pull is needed - your trigger should be set up for a distinct, crisp second stage so you are confident of when the rifle will fire.
If you are switching pellet types frequently, you need to give the rifle time to settle in with the pellet you are going to use, maybe 50 shots, before expecting to see the best accuracy from that pellet.
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