Ken Campbell Iowa
posted this
01 February 2017
re: no. of grooves :: in testing 22 rf barrels we tried 2, 3, 4, 5, 6 in premium barrels. there was some thinking that the 2-grooves didn't shoot quite as well in the wind ... they shot better indoors than outdoors ...
however we could not tell any difference in the other choices . and i would expect in the larger diameter 45 cal. it would be even less sensitive to number of grooves ...
so that would suggest that would allow you to concentrate of the other parameters of your barrel . and if you like 3 grooves, that should be just fine, but maybe ( krieger ) doesn't make 3 groove ... no problem . BTW we found cm and ss barrels to be equally accurate ... and finally, surprisingly ( ? ) ... my most accurate barrel was a douglas cm in match select and cryoed ....... as mentioned above, with barrels it helps to be lucky ...
for barrels that into which i thought i might recut different chambers ... i left 5 or 6 inches of straight diameter at the breech end ... then started the straight taper to the muzzle . this also puts a little weight between your hands, not a bad thing in a 45-70 ( g ) ...
love your project, please keep us informed . we need to learn along with you .
ken