90 FPE .224 Marauder

hey-Hey!!!,
I built a.224 Marauder around a TJ Hornet liner. 27″ barrel, 14″ twist and installed a 53 ci Catalina tank for the air supply. It has a custom valve, and a pull back bolt with a flat face. Firing position leaves no part of the bolt across the transfer port, though an adjustable stop to act as the velocity needle does in the OE valve is next. It shoots 20 shots across about 350 psi with a 15 fps spread centered on 950 fps. Boolits from a Lyman 43 gr mold that turns out to be 45 gr with 2% Tin content alloy. Boolits lubed with 30 wt Bel Ray fork oil. The barrel requires a weight to tune the oscillation, and with a short bit of adjustment tuning I get dime sized groups at 40 yards consistently…:) more work is required to set the weight right where it belongs. This down from a group size between an inch and a half and an inch and a quarter. Weather warm enough to shoot w/o freeing one’s fingertips would be most welcome.
cheers,
Douglas