I've got a 16" 30-30Win and it is one of those that is just "wicked accurate". It easily does moa with several different loads including the 'for mentioned 125BT. I bought mine with a group of shorter pistol barrels. It was a 21" carbine barrel and I just set it aside thinking I would sell it and make the deal on my pistol barrels even better. Later on I started using a 16" 22lr as a pistol barrel and really liked it. One day I saw the 21" 30-30 barrel sitting in the corner of my safe and the light bulb came on
....so I got out the chop saw and whacked it off at 16.25". Then dismay hit me like a load of bricks
....the bore at the new muzzle was way off center. By "way off center" I mean at 8-10 feet away you could glance at the muzzle and notice it being off. Again I just set the barrel aside knowing it wouldn't hit the barn...from inside. Much later I was pondering what to do with this piece of junk....finally I decided to shoot it and see just how bad it was. So I bolted on a pistol scope and set up a big piece of cardboard at 25yd and fired 3 rounds..........one hole
.....other two must have missed the whole board...but looking closer it became apparent that more than one bullet went through the hole...wow. It's been one of my most accurate factory barrels ever since. Don't see how really...but love it!!!
But...I use my as a pistol not as a carbine. Good luck with yours.
Walt