I have never had any accuracy problems from Ruger No. 1 rifles whether factory chamberings or my crazy wildcats.
.395 Tatanka:
One of those 1-H Tropical .416 Rigby No. 1's was rebarreled with a custom profile 26" long and 0.710" muzzle diameter, Cerakote matte black chrome-moly.
Exactly 9.0 pounds as pictured below:
And the Master Mechanical Engineer and Gunsmith who screwed up the chambering identification,
bless his heart, might have been a medical issue with onset of a retinal condition:
I have access to laser engraving now, cheap and quick and just excellent.
One of the few things in life where you can have all three qualities,
after a half-million dollars of high-tech machinery is installed by someone else.
Patriot Laser Engraving
My first use of it was to honor my Gunsmith of over the last 23 years, to put his name on a .458 WIN MAG, not trusting his stamping anymore !
The .395 Tatanka Ruger No. 1 is dressed in drab, but somehow more appealing to me because of it.
The cartridge itself has taken deer, baboon and zebra with equal aplomb in pass-throughs from any angle with one of these:
340-gr/.395 GSC FN or HV at 2750 fps,
330-gr/.395 S&H FN at 2850 fps,
310-gr/.395 S&H Hexploder at 3000 fps
240-gr/.395 CEB MTH at 3300 fps,
from the 26" barrel.
From the bullet trap, expands in water at impact as low as 1600 fps, S&H 310-gr Hexploder:
About 2800 fps MV is most comfortable with those 310-grainers:
100-yard 3-shot group above,
50-yard 3-shot groups below:
The Ruger No. 1: Stout and accurate, even when re-barreled to a just about any wildcat with a rim no bigger than a .577 NE.
If NECG actually did a 20-gauge on a Ruger No. 1, I wonder how.
My Master Gunsmith tried and could not get the extractor to work on a rim that big.