I've not used any of the lil gun powder, 2100 for a 200 grainer fromthe max case seems quite warm. I'd be interested in how fast you push a 180 Hornady XTP with it. Best I have been able to do is about 1830 with the Rem 200, but it is an accurate bullet and expands well in newsprint. It is designed for low velocity, Remington only claims 2050 or so for their 35 Remington factory load, so we are certainly inside the poerformance envolope for the bullet, even started out 200 fps slower.
I agree with DJ, I think the 180 is about perfect for the Max, and it seems someone killed a deer this season and posted here about it using the LBT 180. I push the Hornady 180 XTP with 26 grains of 1680, and the Remington 200 with 22.5 grains of 1680.