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My manual says 10.5 grns. of H-110 for a 40 grn. bullet. When working up a load for any gun due it in the hottest weather that you will shoot that ammo in. The hornet is especially bad about going over presure because the case is so small and your useing fast burning powders. Also always use standard primers, never mags. in the Hornet. The more you crimp the bullet the more presure it takes to get the bullet started and the higher your presure will rise with a given powder charge. If you start loading at abt. 9 grns. of H-110 and work up your load 0.1 grns. at a time on the hottest day of the year and drop your powder charge .2 grns. when you start to see presure sighs you`ll be good to go for max. velosity. BUT, no more than you can get from the Hornet I would recomand that you shoot a group about every .5 grns. and work for your best accuracy instead of greatest velosity.
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Catfish
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