That gun has similar loading diet to mine.. 300 smk, 3.775 OAL, cci 250, 92 H 1000, 10 thou off lands ? I like the paint theme too. Did you add the mag box after you originally got it together ? How does it go ?
Here is one I built for a customer a while ago. He floats across the board once in a while.
I think you said your rifle is at 19 lb's ?? If so how did you weigh it up.. Quessing the stock ? I think it would be steady to hold with that ! Weight is a bonus with LR stuff anyway.
I don't know why your load of 93.0 grns of H1000 olny yeilds an avg. of 2812+fps. I have shot and help test a .338 Lapua with a 32" 1:10 Douglas zingging 300SMK's at an avg. of 2981fps with 11fps ES. We are using 92.2grns of H1000. I guess the Lapua case is a little more efficient.