You didn't mention too much about the cast bullets so let me ask:

1. Has the lubricant dried up and what type is it? Graphite, Alox, Etc.
2. As noted by Delta 419, if the bullets don't have a copper gas check, keep your velocity down, I wouldn't start out at anything over 1,200 fps until you know if the alloy will stand up to slightly higher velocities.
3. That 10.0 grains of Unique would be my choice for shooting up those cast bullets.
4. Check your bore too. A rough bore may lead too much for cast projectiles. A worn bore may not grip those bullets sized to .308" and require something a bit larger like .310."
5. The older Lyman Cast Bullet Handbook Number 3 has the most pistol or fast powder loads. The later Number 4 has lost that info for some reason.

Good luck with the old war horse. I shoot a bunch of cast bullets through my 30/30s. My favorite cast bullet is the Lyman 311041 (170 grains) sized to .310" with a gas check and NRA Alox lube.

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Keep your powder dry.