Any way wanted to send the slugs at more speed, may buy a slug liner at a later date, so installed the heavier hammer weight & adjustable pellet probe.

 Up the reg pressure to 140 set the hammer set up at 6mm. Well first shot witha 25g H&R  was over 1150 fps, many shots & tuning later I have it down to 980fps, which is good although havn't tested it for accuracy yet. The bummer bit is it shoots all pellets at way out past 1000fps, uncontrollable, power settings don't rhym with 1 shooting a thou plus & 3 slows but still, way too fast. The hammer weighs many heaps more than  the old one & is designed to do .25 & 30 cal, as well. Natually shot is about 1/3 of what I was getting. Reg pressure is now 125 & hammer backed off .  Still can't understand the power wheel carry on. Oh well play time. 

 For example I have been shooting some 25 grn .22 cal slugs at 844 fps getting 15 mm groups at 50 m, but after that the groups open up.