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Got any Herco? 9.0 grains will get you about 950 fps with a 255 grain cast bullet and still be just under SAAMI specs. If you have a modern gun you should be able to push it to 9.5 or 10 grains.
That 6 grains of Promo load is still well over 400 ft/pounds at the muzzle though, and makes a really big hole thru whatever it hits.
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