FYI,
My rifle is Winchester 70 ( 30-06 )with an Elite 4200 3-9x40mm
I just did one simple test for fun.
I take 10 case, put WinLargeRifle primer.
I take a Look on different reloading data, and notice there almost the same for the H-4350 and the IMR 4350.
So, I put 59.5gr of each one in 5 case.
and seat over it a 165gr Nosler Bal-tip, COL: 3.250 inch.
I placed 2 target at 100 yard, and fire one round of H-4350 on the left target, and one of the IMR-4350 on the right one.
After all the 10 round were fired, i went to target to notice a huge difference.
The Load with the H-4350, give me a spread group of 2 3/4 inch.
the Load with the IMR-4350 give me a tight group of 3/4 inch. ( WOW )
Now the Speed:
H-4350 = 2865 fps
IMR-4350 = 2885 fps.

Notice else to say, in my rifle, the IMR 4350 is the one she love!!!