Sorry i have been very busyGent's
I pulled that design from this forum discussing the Grendel and cast some where. Reason I posted it is that it "should" be a performer with a Grendel chamber then again maybe not. I would absolutely love the credit for designing that but truth is the truth.
I emailed JTknives maybe he did not get the e-mail on it, or he is that buried, as I have not heard any traction on this.
But a Plain base should be offered as well as a Gas check in my opinion. If someone would get a buy going on this I would be in. seeing how 45 2.1 is talking on this one he might be able to set up something heck I would wait a year if we get a sign up sheet and a design going. I suspect what would be the killer or deal breaker on the 100-125grain weight on this mold is the Alexander Arms chamber. IF need be I have a barrel and can cast a cerrosafe of the Chamber Leade/throat to assist the design of the mold and send a 6.5 sierria 120gr and a Hornady 123 Amax, that should help with the ogive.
So somebody shoot a PM that they are doing the design or redesigning I will chamber cast my rifle barrel and send two jacketed bullet that are known workers in the Grendel, provided of course that is agreeable with everyone. AA uses a compound throat, two angles like the Enfield on their reamer (at least that is what Bill Alexander told me personally over the phone). I have even entertained a Swage Die to get going on a half jacket using 22LR fired cases, just to be able to make some boolits.
For the 260 Rem guys you should be able to seat further out and make a go of it. I dunno
45 2.1 pm me on this I noticed you mentioned a chamber casting after typing all this