Re: Imr4350 vs h4350
Hornady 7th edition recomends;
38.3gr of H 4350 for 2600fps
39.7gr of H 4350 for 2700fps
41.0gr of H 4350 for 2800fps SAAMI MAX LOAD
For 105gr A-MAX .500 B.C. IN .243 Win
Hornady side note;105 A-MAX will not stabilize in a 1-10 and slower twist bbl.
I do not load for this caliber, so I have no hands on experience with these loads, but its word for word from Hornady book
(Ironicly, they have 0 load data for 105 gr A-MAX using IMR 4350) Good luck hope this helps
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