I wonder if H&R had Winchester make barrels for them at some time since Win used the 12" twist in the M94. There are twist rates (all 10" IIRC) and groove numbers in the link I posted, the question is, what's "typical" for H&R!!!
I added a 1:12" note on the twist rate list in the FAQs.
That could be when it comes to Winchester making Handi barrels.......or maybe they used Winchester equipment. If they used Marlins equipment at one time, then why not Winchesters at another?
Thank you for adding the 1:12 note in the FAQ. For years I didn't want to bother shooting cast in my .30 barrel, because I thought it was a certainty that it was 1:10 twist due to the info in the FAQ section, which sounded definitive to me. The reason I was so excited the day I realized it was 1:12, is because it meant to me that casting for the rifle would be much more feasible.
Try as I might, I could not find info as to the number of lands and grooves for a non-microgroove 30-30 barrel in the two links you shared above. I did find a post about a .308 barrel with 6 grooves.
I also checked the thread lists in the FAQ section, and the only thing I saw that had anything to do with Land/Groove dimensions was a post distinguishing between the .223 caliber 1:12, and .223 caliber 1:9 barrels. I found the specific land groove dimensions for the .223 in the FAQ.......but, incidentally, there was no mention of the number of lands/grooves).
One reason I am wondering, is that I have some slugs I dug out of a berm that was shot into with the Handi 30-30, and also a Win 30-30.......so I'm wondering which rifle shot these slugs I recovered from the berm, since I can see the number of lands/grooves on them (6).
So if anyone knows the typical number of lands/grooves in the NON-microgroove 30-30 Handi barrels........barrels that are NOT micro grooved.......I would appreciate the knowledge. It would be another piece to the Handi 30-30 barrel puzzle.
Thanks for any and all info shared!