This 3 shot 100yd group was shot with my Pro Hunter w/ Encore Bergara barrel using a 300gr Harvester PT in a smooth sabot and 100gr of Triple 7 3F a few weeks back. Chrony results were very consistant. I swabbed with a CVA Barrel Blaster patch that was squeezed of all its juices and followed up by a dry patch. I see no problem in you using T7, just take your time between shots and keep everything consistant. I did foul the bore with a primer for the first shot. Try Sabotloaders Windex patch's, I have about 30 patches made up and ready to try.