I can't comment on the Encore or a 15" barrel but I have the 204 in a 14" Contender barrel. I shot a 5 shot string of 26.0 grs. of 10X through the chrony for an average speed of 3318 fps. I have since bumped the load to 26.5 grs. of 10X with no pressure signs but have not chronied this load. Accuracy is superb with reloads. The Hornady 32 gr. factory ammo shot about 1 1/2" @ 100 yards but the more I shot the barrel the more the groups shrank. It is consistently shooting right around an inch with factory ammo The 40 gr. factory ammo sucks out of my barrel, you couldn't even call it a group. I have not tried reloading any of the 40 gr. Vmax's. All my reloading has been done with the 32 gr. Vmax or the the 35 gr. Bergers, both shot great. P.O. Ackley said in his book on wildcat cartridges, in reference to the 20/222, that "perhaps a better cartridge would be the 222 Rem. Mag necked down to 20 caliber." So maybe Ruger had a good idea, hmm. As usual, if anyone uses the data above please use caution and remember to start low and work up your own safe loads. As far as noise and muzzle blast, it is not an issue with me, but I'm pretty new to this pistol stuff. Oscar-eleven