I thought the artillery hold would work for the Trail XL too.
I even tried variations of the artillery hold - gripped, then open palm, then on finger tips, then just resting the stock in front of the trigger guard on a shooting bag. None of them worked as well as holding the forestock right where Crosman put the checkering. That, and pulling the butt into my shoulder like I was shooting a high power centerfire made an incredable differance.
If I move my front hand forward, or rearward off the checkering the groups open up. Also, if I don't keep some back pressure on the pistol grip to pull the butt into my shoulder, the groups open up.
A few days ago I added the leather cheek pad because the high rings make for a very poor, inconsistant checkweld. That helped some too, but this gun likes being held like a high powered powder burner.
Paul.