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I would recommend you try H4895 or if you can find it VV135 or VV530, you should be able to get at least 3800fps from your 24 inch barrels.I had the same problem although I have a 22 inch barrel I was getting 3600 to 3700 with max loads of all the powders you mentioned but ended up with VV530 running 3850fps. I actually got higher speeds from VV135 but ES was high so I quit on it. H4895 I have not tried but have heard that it gives good velocities as well.