Thanks for posting that. Looks like a powder for the looniest of gun loonies only. I am not that hard core not having a complete ballistics laboratory at my disposal.
My intent sure wasn't to scare anyone away from using IMR 7383, because it is great for certain applications--plus, it used to be relatively inexpensive. It's just that anyone who hasn't used it before should be aware that it has "different" characteristics which might lead to trouble if one isn't aware.
I forgot to mention in my previous post that I like A-8700 w/heavy bullets in the .300 Win Mag. It worked really well with plain old Hornady 220gr RN in my Ruger #1B. I forget the exact load data, but it was essentially just the starting loads from the Accurate #2 manual, maybe adding another grain or so.
We have the same issues here in Georgia that David (x2mosg) mentioned having in Alabama at the beginning of this thread; that is, the smallish Southern deer don't need all the power the .30 Mags offer--it just ruins good venison.
This thread got me looking at an older Lyman manual (46th ed?) which lists some .30-06-level loads for the .300 Win & Wby Mags using the old standards--IMR 4064, 4320, & 4350. Sounds like a project for this weekend, especially if it rains!