I have a question,hornday 243 90 grain gmx I have 3031 4350 cfe223 and reload 22 in powders, cannot find a good starting load, rifles are 243 howa and a savage 243 both 22 inch barrel
The only powder in your list that appears in Hornady 11th manual is H4350.
Start 39.2 gr, Max 45.0 gr.
Hodgdon's site will give you starting loads with a 90 grain bullet using IMR 4350 and H4350. Starting at the low end should be fine with the 90 grain GMX.
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