The solution you're seeking was made about 10 years ago by a member of 24HR Campfire forum who goes by "cotis",
They are a simple replacement for the factory rear end of the magazine and allow a c.o.l. of close to 2.5".
One fellow was loading the Hornady 75 Amax at 2.429 which put it .010 into...
THANK YOU, ROB!
You just prevented me from committing a heinous crime against Ruger collecting.
Years ago I bought Single Six 436716 from a member here. It was missing the cylinder
and since it was marked Single-Six I assumed it was originally a L.R.
But thanks to your chart I see that it...
As stated above, if you find the box you'll have most of the answers you seek.
The picture shows a M77 Magnum, but your description said 26" barrel.
I believe it should be 25". Measure from the face of the closed bolt.
Yes if the date of birth is correct I'd say it's a Wilson barrel.
When I visited the Newport plant in '91 they were phasing in the in-house
hammer forged barrels caliber by caliber.