I just recieved a new Contender Carbine barrel from Bullberry Barrels in 17 Mach IV. If anyone has any tips on brass forming or load data it would be greatly appreciated. I have some data from the Ackley books and another source, but modern powders would be nice. I'm looking forward to shooting this, as the last barrel from this company was extremeley accurate for a TC. The first 10 shots of my 6.5 Bullberry (6.5-30) went into less than an inch, with case forming loads. I've since got some varmint and hunting loads that are approaching 1/2 moa. It'll do 3/4 moa all day long if I do my part. Any info would be greatly appreciated.