56-50 Armi Sport Spencer Loads, Revised

After a lot of rounds down the barrel I've got what I think is a good load for 100 yards for the 56-50 Armi Sport Spencer.  I flipped the ladder sight up and sighted through the lowest notch.  See picture below:

Powder	Trail Boss, 8.8 grains by weight
Bullet	350 grain RCBS-82309
Brass	Starline 56-50 Brass
Primer	Federal Large Rifle Primers
OAL	1.585"
Crimp	Heavy

I went to the range Saturday and here's the result.  Ten round group, 100 yards & the target face is 8 inches in diameter:

This is also a good load for 200 yards with the ladder flipped up and the slider down all the way to the bottom of the ladder.