Mike,Thx for posting those pictures and additional details. You started to take the mystery out of how you were accomplishing that, for me. For the 257 Cothran BD tune, was that your simplified balance valve? I see delrin seat but also the pin, so wasn't sure. If so, were you able to get a bell curve like what you did with Mrod?
With the gt bullets what kinda shot count are you getting out of .257?
Never mind the link I found the GT bullets site. It doesn’t say what lead mix they are using. I’d be willing to bet they are too hard. 40:1 lead tin or pure lead seem to work best. I’ve tried up to 20:1 and at that point the bullets were extremely hard to chamber as expected. Now I only buy the 40:1 from western metals or Rotometals.
So if you added the pitbull 160cc extended tank.And a regulator........what do yo think the .257 would be capable if......or without the regulator.Say 16 shots in .257......Secretly gathering ideas for another gun.....
That does look pretty rough. Almost as bad as one of the B3 barrels I had a while back. It was a good pellet shooter though. Wish you luck.