Well I called Barnes and told them that I was getting an MGM bbl in 30-30win for use with their copper tsx bullet due to the lead ban in Ca. They have contender test bbl that they use for the 30-30 and told the 1-10 twist was find but nothing abouit it being to high pressure. The guy also suggested handloading the 110gr and 130gr. Now these are the "tripple shocks" not the original "X" bullet.