Greetings,
I had two rifles of the same make and model at one time but their chambers were quite different. If your load is no higher than current book max then cutting back a couple of grains and chronographing would be my choice. I would only do this if all the components and their lots are the same. You would still need to check projectile seating depth. You will still need to load the cartridge for his rifle. So in reply to your original question no it is a bad idea especially if your load is tailored for your rifle.
Regards Grandpamac.
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