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I've had pretty good results (on Reds, Fallow and Tahr) with 100 Gn Pro Hunters in my 250 Savage, which will be pushing them out the same or a wee bit less than your 303-25

When you have a fired case from the rifle fill it with water and weight it (make sure you strike the neck off level) and give me the case length and COAL you're working to and I'll run it in...