6mm 7.5 twist SS Competition 29"
4 groove cut rifling, 1.250" for 6", taper to 1.10" @ 29"

6MM 29" Blank weights
M24 6lb 13.8oz
Heavy Varmint 7lb 6.9oz
Competition 8lb 10.oz
1.250" Straight 9lb 9.3oz