25 cal 7.5 twist SS Heavy Varmint 29"4 groove cut rifling, 1.250" for 5", taper to .900 @ 29"6MM 29" Blank weightsM24 6lb 13.8ozHeavy Varmint 7lb 6.9ozCompetition 8lb 10.oz1.250" Straight 9lb 9.3oz