Because I can. So there.
Actually, part of this is also because of some oversights in the past on .303, so I put together some more which worked out as follows, all five-shots at 30 yards:
100-gr. SWC, unsized, over 3.2 grains Bullseye, OAL 2.64"
Same load with the bullet sized .314"
And that Lyman 115-grain spitzer, unsized, 3.0 Bullseye, OAL 2.73"
The other was .30-06, with two differences: this rifle has a scope, and it's a M1 Garand. Yes, you have to single-load them. Wanted both to see how they'd shoot in it, and, it having a scope, might remove some of the human error involved in me and iron sights. So, also five-shot groups at 30 yards,
.30-06, 100-grain SWC, unsized, over 3.2 grains Bullseye,
.30-06, 155-grain spitzer, sized .311, 3.17" OAL
And the 160-grain spitzer, sized .311, over 3.0 Bullseye, 2.9" OAL
If needs be said, all these- out of the Enfield or M1- had basically zero recoil. And afterward the bores are nice and shiny. I'll try to break the M1 down later and look at the gas port(things like this would be a nice use for one of those inexpensive borescopes) to see if any signs of fouling; I doubt there is.
One more thing: I did manage to put a recoil pad on the project rifle, and tried a few rounds; HUGE difference, well worth doing. I'll have more on that later.