0.080" is indeed pretty short for the 200.20Xs as noted by several others above. I have a Varget load with 185 Juggernauts in a rifle that has a fairly similar chamber to the Obermeyer (0.085" freebore, .342 nk, 1deg30). With the bullet seated at ~.015" off the lands, COAL for this load is 2.898". With 43.4 gr Varget, I'm getting about 2720 fps from a 30" barrel. This load is extremely accurate/precise, albeit a little slow.
The important point for this discussion is that when seated at ~.015 off the lands, the 185 boattail/bearing surface junction is just
barely above the neck/shoulder junction. That means it has higher pressure than would be required to achieve the same velocity with the bullet seated farther out in the neck. This load runs at just over 61K psi (Quickload prediction), which although under MAX SAAMI pressure for .308, is fairly hard on standard .308 brass.
The 200.20X BTO dimension is ~ .030" longer than the Juggernaut, which means the shank/boattail of the 200.20X will be seated
approximately that much farther down into the case if seated at the same seating depth relationship to the lands. Is that extra length enough to cause pressure issues? Perhaps not, but the short freebore would force you to seat the 200.20Xs much deeper in the case than would be considered "optimal". The use of Palma brass (rather than standard .308 brass) would likely minimize any potential overpressure issues.
The bottom line is that Lot-to-Lot powder variation can change the charge weight required in a .308 to vary by as much as half a grain or so (worst-case scenario) to achieve the same velocity. You can use charge weights posted here as rough estimates to find a starting point for your own load development, but powder variation and differing freebore lengths may mean you end up with a significantly different charge weight from what others are using. So you'll need to optimize a load for your specific setup regardless. A better way to approach that, IMO, is to use velocity, rather than other people's charge weights, which may differ widely from what you find for the reasons I mentioned.
With a 30" barrel and Varget, you will likely find the "sweet spot" for the 200.20Xs will be in the 2630 to 2660 fps range. With H4895, the "sweet spot" will likely be in the 2650 to 2680 fps range, or about 20 fps faster than Varget. I'm getting ~2670 fps with H4895 and the 200.20Xs from a 30" barrel with .180" freebore. Considering your shorter freebore, these velocity "windows" are only approximations, but I think you'll find it easier to dial in a load for your setup based using the target velocity windows, rather than other people's charge weights, which may possibly vary widely from whatever you find to be optimal. At a minimum, if you use any of the charge weight information posted herein as a guide, be conservative and start
at least one half to three quarters of a grain low and work up in small increments, measuring velocity as you test. That way, there shouldn't be any great risk of overshooting the velocity [pressure] window optimal for your specific setup. You may also want to check out another post from here at A.S. regarding the 200.20X, it may provide additional insight into your questions regarding loads for it:
http://forum.accurateshooter.com/threads/new-berger-308-bullet-with-wicked-0-328-g7-bc.3909267/
