I personally would build garand specific ammo, not necessarily because of the charge but because of the need for full length sizing and gauging for the Garand that isn't needed (and indeed may be detrimental to accuracy) for the bolt gun. Bolt gun is for hunting, I FL size already, 1 MOA is good enough for the rifle's purpose.
Garands are rough on brass. Did not consider this, though it makes sense, being a semi.
Another issue is the load your Remington shoots well may not shoot worth a dang in your M1. Garand will be a CMP SG, so I am not really expecting much in the way of accuracy.
If you absolutely prioritize one load for all rifles, I would either get an adjustable plug or find a load that's Garand-safe that is acceptably accurate in all your rifles. I agree, but the bolt gun is used for hunting, the Garand will be a range toy, so bolt gun is the priority load, IF I keep them the same.
And remember, you must FL size and bump the shoulder back at least three thousandths for the Garand. I'd get a Wilson case headspace gauge or similar and check all brass after sizing, every time, and size to the lower step to be safe. Good advise, thanks!