Ok cool.. Next up find out what will fit in the throat and size to fit the throat.
I shoot that same 310gr GC boolit cast in 50/50+2% over I think 17.0gr 2400 and it shot pretty good, was easily a deer killer out to 50+yds out of a 7 1/2" SBH. I modified a Lee collet style FCD and "fine tuned" the crimp band to my liking by making the crimp band narrower and moving it down onto the case mouth. This crimp was VERY instrumental in lowering my ES to numbers below 20, groups responded in like kind after using this crimp. Here is a thread I wrote and documented the mods to the die:
https://castboolits.gunloads.com/sho...=1#post2239315
I also discovered that the softer the alloy, the greater crimp is needed as under magnum loads, heavy, soft boolits will move as they can swage against the crimp enough that the base of the boolit can move disrupting your case volume and causing pressure to react accordingly. Harder alloys tend to not migrate against the crimp.
The modded FCD keeps things in place and provides a nano amount of delay which allows the flame front more time to build, and prevents the boolit from moving just from the initial pressure of the primer firing off. IMO, a hard roll crimp on a soft bullet alloyed for hunting is not enough to insure no movement will occur.