We only offer the .30 "Tight" caliber barrels up to a 1-12 twist. The reason being, we have seen pressure issues arise when using heavy, long bearing surface bullets in this tight bore/tight groove configuration. We strongly suggest against using bullets heavier than 175 grain, and/or magnum pressure cartridges in any .30 Tight caliber barrels due to the dangers of high pressure and the increased chance of copper fouling.

Thank you,

Krieger Barrels, Inc.