I'm just gearing up to try out my Mauser 66 in 8X68S. I discovered that none of my RCBS shell holders nor my Forster trimmer collets fit the odd ball 8X68S rim,
so I have a couple of RCBS #34 shell holders on the way and a special order collet from Forster. The cases I am loading right now are once fired ones I found on eGun, but I will anneal them just to be on the safe side.

Since I'm planning on trying my rifle out on the local white tail population, I intend to use some 175 gr. PPU bullets I have on hand, rather than something heavier and more stoutly made. In the past I have had bullets exit without expanding, for instance a 250 grain Silvertip factory load in my .358 Winchester.