Thread: School me on Sako Vixens...

@Bagheera that magazine floor plate & trigger guard are not sitting correctly in that stock. They should be flush & flat, so this could be part of your mag operation problem. The mag box has to sit into the floor plate housing cutouts properly and then up against the underside of the action. If you assemble it all out of the stock, you will see what I'm on about. I had to fiddle with mine a bit to get it lined up correctly in my aftermarket stock.

I completely agree with Mathias, rifle isn't assembled correctly.
I see you had a pressure question,
I can't find a psi limit for the 6ppc in my load books,
60000 psi is the pressure limit for the .243, .260 Speer#14,
65000psi, is the limits on the likes of the .243Wssm, and .270 Wsm,

The 6ppc is loaded pretty hot in custom chambers, I've got load data for my Sako, that is 3gr more than I can fit in of VV133, original owner was using a 400mm drop tube,
I doubt you get enough powder in, as long as it benchmark, Vv133, one XBR8208,
Keep an eye on your brass, and use common sence