Thanks for the magnum report, Tom!First thing I noticed was the (lack of) pellet choice. Are the Premier HP's the best pellet for both guns? That would be surprising.My experience with Crosman Premiers in the tins is that they have the largest mix of actual head size of any pellet I've seen; literally all over the place. I personally wouldn't expect any accuracy from them.
The Crosman Pointed Hunting Pellets are a lot more consistent out of the tin than the CPHP's, it also depends on the choke in your barrel! MY U.K. Tomahawk in .22cal I have it re barreled years ago with a LOTHAR Walther barrel, the choke in that barrel is tight and will shoot any of the Crosman pellets out of the tin no matter how bad the head sizes are! and shoots them in the same hole!
I have found hat the crosman premier domed or hollow point pellets work acceptable enough across my air rifles that they are what I stock pile . They are minute of critter at the acceptable range of the gun. The only gun I have that doesn't shoot them well pushed the 177 in the mid 1140's I would think a hatsan 125 in 177 would likely have the same problem O.P thanks for the side by side comparison.
I find the Crosman pointed .177cal pellets don't compare as far as fit in the .177cal very inconsistent as opposed to the .22cal pointed, the .22cal's shoot out of all on my HW barrels and my COMETA barrels and my Diana 460mag!
If you have a Meijer store around, you? those pellets here cost $3.99 a tin