After some more reading on the subject, I decided to try using 5.0 of Unique out in .30-30, 7.62x54r, and .30-06. Gave them a try today.
.30-30 used the same three bullets as in the 3.0 grains of Bullseye experiment.
and, as a pleasant surprise, the .32 wadcutter
And, just as a try, the Lyman 115-grain spitzer designed for the .30 Carbine, used as-cast, lubed with Liquid Alox, no gas-check.
The 7.62x54r, with the SWC bullet and this load, was so-so.
It appears that center hole is for two of the five.
Frankly, it may be that with a bit better light and more solid rest the SWC loads may have looked better; that was the last group of the day and I'd started being distracted by the Tommy gun.
I did try .30-06 with the 115-grain spitzer, no gas-check, with this load
This is mostly for fun, seeing what can do with light bullets and very light propellant charges. Five grains equals 1400 charges from a pound of powder, not much noise and almost no recoil. Be great loads to teach a new shooter with.
And I'm curious, would that SWC load shoot better in a different Mosin-Nagant? How would it work in a Lee Enfield? Makes me wish I had more rifles, and a range in the back yard.