Greetings,
As Micky said there is plenty of data on the Hodgdons site using H4895 (AR2206H). See their sheet on youth hunting loads. They give loads for lighter projectiles but you can use their technique with a minimum of 60% of their listed max load for your chosen projectile and work up from there. I have used this for reduced loads in my .308, .303 and .30-40 rifles with good results. Mostly the best results sit around 80% of the Hodgdon Max load. It is unwise and possibly dangerous to reduce loads below start loads with any other powder, especially in magnum cases.
Regards Grandpamac.
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