I bought a 236 grain 8mm monster from Buckshot maybe 20 years ago. It has a similar multi-band form. I greased the gas check default-groove and the two above it and seated them over 16.0-18.0 grains of 2400, and they all left no doubts about primer function. They did shoot very well, though--and I took them deer hunting with me back when lead bullets weren't VERBOTEN for game-taking. No critters other than varmints fell to its connection, and I still have the mould in the shop. Maybe it needs a test-drive with Ian's Condor Cuddler Metal.......