I had traded for 2 #3's, a .223 and a 45/70 a few months ago, and had neglected them long enough. The .223 has a 4x12 Vortex on it, and despite the barrel band, it insisted on shooting cloverleafs with some 55gr and 69 gr BTHP's as well. Shot the 69 grs about 3" lower. I ended up zeroing it on the 69's, as I am transitioning all my .223's to that one bullet, which I have a lot of, and they give about 243 performance on critters, so much for Ruger#3's not shotting well with barrel bands. It did surprise me that the twist was correct on a older rifle to shoot the heavy slugs well.
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The 45/70 had Ruger factory steel mounts, only ones I have ever seen on a #3, all the others had Weavers on them. It came with a pristine old Redfield 4x Widefield scope in the rings. The scope with the rings had been removed for shipping. I had mounted it back on, and tried some 350 gr cast with 14grs of Unique behind it, was wondering what the recoil would be like. I was worried over nothing, hold it tight and a light push was all I got. I had a4x6" red clanger at 100 yds, and my first shot off of bags, was dead center, maybe 1" high, the second one hit the edge of the first splatter, and the 3rd one was in the first splatter, easily a one inch group, to say I was ecstatic would be a understatement. Then I tried a few off hand, and went 3 for 3 off hand at 100 yds on the same clanger. This gun/load may be my new 150yd and in deer rifle. Again, so much for the barrel band affecting the accuracy. I went back thru my notes and every one of the #3;s I have shot, shot as good, or in most cases better than the #1;s I have owned and shot. It is my beleif that if you dont shoot long streams and get the barrel hot, the barrel band actually helps with accuracy. Just thought I would share.