I just built a 280 Ackley with a 26" stainless #7 Douglas 1&9 twist barrel on an old Ruger tang safety with a Boyd laminated stock. My best 5 shot 100yd group, is just fair .965 with 56g H 4831 and 162 Hornandy SST at 2600 fps. If my old chrony is right. I have also tried 139SST and 154SSTs. The 154s will shoot around 1" with 57g. If I up the charge the groups just keep getting bigger the faster I push it with all bullet weights.. I have also tried Imr 4831 and R 22. They do the same the faster it goes the groups get bigger. I have a little over 100 rounds through it so far, doing the old shoot and clean routine. That is another thing, this Douglas barrel is the ruffest barrel I have ever seen. It copper fouls really bad. It looks like it was honed out with 36 grit sand paper. The other day I ran some JB and a little Friz into the barrel to try and smooth it out a little. The Copper fouling does not bother me as bad as not being able to get 2800 to 3000 fps with any kind of accuracty like everyone else seems to be getting. So far I am a little disapointed in this barrel. I would rather have accuracty than speed but I sure was wanting it to be able to shoot a little flatter. On the brite side it is not a barrel burner. I guess it is what it is. Maybe I should try something besides the SSTs.