Tuning Sizing help with marauder pistol .22

I am looking to purchase a moderator for my .22 benjamin marauder pistol. I keep seeing to go one size up to prevent clipping but everything I see for sale lists 2 sizes: .177/.22 or .25/30. Does the .177/22 account for the clipping or does this mean I should get the .25/30? New to all of this so any help is appreciated!

In my experience, you should be good with .177/.22
 
I am looking to purchase a moderator for my .22 benjamin marauder pistol. I keep seeing to go one size up to prevent clipping but everything I see for sale lists 2 sizes: .177/.22 or .25/30. Does the .177/22 account for the clipping or does this mean I should get the .25/30? New to all of this so any help is appreciated!

Will also throw out that too large of a diameter on a P-rod means it has to be removed in order to fill with air, unless you have an angled male foster or some other modification.

I have a Buck Rail moderator. No adapter required and is the same diameter as the shroud.
 
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Thanks all, I have an adapter already and the sumo arriving monday. I knew about having to remove it each fill but since i have a compressor at home i didnt see that as being too big of a drawback.

However the magazine ive already smashed. I had a hell of a time putting it on the pistol. Once on all rounds shot fine but busted it trying to remove it. I understand you want a snug fit but i feel like something wasnt right.