I have shot a ton of 450 and 500 grain tsx with h4831, v100 hybrid, and i did not like regulation out of my double. I tried 450 tsx with reloader 17 and that did not shoot well either. So I stopped using tsx with my double.
90 grains of h4831 gave me 2120fps with 500 tsx. I shot them anywhere from 85-90 grains. No over pressure issues. But the pointy bullet were just not accurate out of my double. I now shoot peregrine bullets in 480 grain with good results.
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