The 177 gives a flatter trajectory from the same given power supply and in some cases better penetration. There is something to be said about carrying 1000's of pellets at half the weight of the 22cal pellets AND having a more accurate shot as well as "slightly" better range.The .177 Cal will indeed shoot further due to being of lighter weight but I have read where the .22 has more knockdown power which to me is logical since they are of heavier weight. Kind of like, "Would you rather be slapped by a 110# woman or hit by a 220# man?" I want neither!
Having said all that, in most cases, with these 13xx Crosmans, you would not be taking a humane shot with either caliber beyond a short distance and I do think the 22cal would be more forgiving on say a rabbit just due to the "wallop" it packs if you did not hit bullseye, vs a 177. Liken it to blow darts vs slingshot...you can debate it in your mind for hours LOL.
22cal has about 20-25% more FPE than 177cal out of the same power supply..but the 177 shoots flatter and will have about 20-25% more velocity than the 22cal...it is really a trade off and that's why so many old timers like the old Sheridan 20cals LOL.
I have plenty of full-sized air rifles, but none of them going with me in bugout...I'd probably grab two 13xx guns in the same caliber for the backpack and as many pellets as I could carry.
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