Had some tinkering time, so I got out my Winchester 94 AE 20" barrel carbine in .44 mag (cross bolt safety) and just thought I would slug the barrel just out of curiousity. Bought new in 2005.
This rifle shoots excellent. Hornady 240 XTP's, and Lyman 429244 GC Sized .430" ACWW, both with 23 gr/H110 and Hornady 300 gr. XTP with 20gr/H110 will group into 1.5-2" @ 100 yds for three shots with a Burris 4x Compact scope. Not hype, it shoots this time and time again. It has several deer to it's credit.
My surprise came when the lead slug came out the barrel with 12 lands and grooves! Never noticed this before in cleaning the rifle. Also I thought the twist was 1-26 or 1-27 when I bought the rifle, but tight patching and marking a cleaning rod, I get slightly over 1/2 turn, actually about 5/8 a turn from chamber to muzzle, so I think it is a 1-38 twist. (Need to find the box it came in, I am sure the Winchester papers had 1-26 or 1-27 twist listed).
The bore miked out to .431" dead-on. This little carbine shoots great as I said, doesn't lead with .430" boolits.
I never had any thought about any of this until today when I decided to check out the bore diameter. Just was always happy I had a tack driving little carbine in .44 mag. My mind was made up long ago I would never part with it!