Accuracy, in my experience, is usually VERY strongly related to a particular velocity in a particular rifle ... and it seems pretty rare that fastest is best. The best thing to do is run a couple of the known accurate loads across a Chrony and then work your load up to match THAT velocity in YOUR rifle ... given, of course, as Brian mentioned, that the target velocity is reasonable for your new powder.
Personally, I cannot imagine trying to load accurate and safe ammo without a Chrony ... but then I haven't stuck to reloading manual loads in a LOOOOONG time ... I tend to go with QuickLoad simulations and Chrony data and use the manuals as a safety check for what should be reasonable.
Saands
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