I started with one of my 338/378 rifles at 112 Grs of WC872 Powder (like H870) with the 300 gr bullet. I moved on up to 115 grs and 117 grs of the same powder that's where it liked it the best.
Your 36" barrel will propel the 300 gr very well and you will be amazed at the downrange energy and velocity that bullet will maintain at extended ranges.
You have the 1 mile "plus" rifle if you have the scope with enough clicks to make the trip.
Have fun shooting it.
I like long barrels, big cases and big bullets with a high BC. You have all three.
Later
Darryl Cassel
[ 02-18-2003: Message edited by: Darryl Cassel ]