Brocock/BRK What Caliber for BRK Ghost?

I am looking at replacing my .25 caliber with a ghost. I see lots of people have the Ghost in .22 cal and the gun seems to shoot the .22 33.9 grain pellets effortlessly. Is a .25 33.95 gr going to buck wind better than a .22? If the .22 is longer and the same weight will it have a better BC than a .25?
Range is 75-100 yards for ground squirrels and 50 yards for marmots.
 
I have the ghost in 25, reg set around 125bar and hammer set to 10 I get 900fps with 33.95. I got mine from tenacious airguns, he took around a week to do the trigger and tune it. It reaches 910fps at max hammer setting. I bet if you turned up the reg it would give more range. It shoots 33.95 on 10 and hades on 1 really consistently.
 
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