Gotcha. I assumed (incorrectly, it appears) that since the 4-32x50 FFP was on your list then a FFP ATACR might be considered as well. If you have an opportunity to check out a baby ATACR with the MIL-R reticle you may reconsider (but maybe not). Good luck with your decision. Nightforce makes...
TAC has been readily available and works well. As a bonus it meters great too. I hear it can be somewhat temperature sensitive but I haven't seen that to be an issue shooting from 30-100 degrees (I live in the Southeast). I bought 4 pounds of 8208 XBR at the same time I bought TAC just in...
I have one of these (got it just before they stopped selling stocks apart from their rifles a few years ago) and love it. I had them (Allterra) bed it and have been very pleased with it. Just get a good gunsmith to bed it for you and you'll be fine.
Alpha necks run a little tight brand new. Lapua comes in a bulk box so I tend to get dinged necks. I always run Lapua through a sizer just to uniform the necks and get the dents out. I sometimes run Alpha through it although I've gotten to where I do that less and less.
Norma brass, Fed 215M primers, Barnes 180 gr TTSX, 68 grains H4831SC, CBTO 2.21 (COAL 2.835).
The above load is fairly hot. As always, work up slowly in your rifle. I have since moved away from Monos but the above load served me well on a bull elk a few years back.