Curt - I am not surprised - on a calm day it is amazing how good the accuracy can be. As I related earlier in this post of our 325 yard shooting down in Southern BC, there was rarely any wind on that particular range - we were very consistant with RB's with rifles of .50 to .62. Our target, I can still picture it now, was about 12" to 14" in diameter. It's whitish surface stood out as a shining mark on the dark earth in the big V-crotch of rock.
There was a wear mark in the browning of Taylor's big .62 Hawken, that when the front sight was held high for the proper sight picture, this wear mark made a white line across the top of the rear sight, making a good sight picture for that range. It's difficult to describe this sight picture, but easy to use and maintain, shot to shot. The front sight was the placed on the rock, of course, and was easily lined up with the centre of the barrel & rear sight notch.
The .50 I was using, had a high buck-horn sight. The front sight, held between the 'horns' and even with the top of the horns, gave the proper sight picture on that same rock. We weren't afraid to use heavy charges, which showed up in the excellent accuracy we obtained at seemingly long ranges.
Guy & his young son showed up at the range with a scoped .303, shot a bit but wouldn't shoot at the rock when challenged by Taylor - said it was "out of range for my rifle. Taylor, standing there with his loaded Hawken, said "it isn't for mine", and promptly splashed a ball off the rock's face. I then put a 128gr. maxi onto it with Tracy's little .36, then pulled out the 4" M29, dropped to Elmer's reclining sitting postion, back against the rear tire of my pickup, gun between my knees and splashed it 5 out of 6 with the 275gr. SWC's. 12 year old kid asked his dad - "why you can't you hit it, Dad" - guy just said, "get in the truck" and they left. Yeah- we used to shoot a lot in those days.