No doubt about it, that's a great looking round! I need to stop following this thread as it is gonna cost me!I wanted to get 2.7-2.8" OAL to use standard AICS magazines.
After playing with my current Robinette chamber, I'm not convinced I need any extra length. Touch point with the 215 Hybrid is 2.435. That length fits perfectly in my MDT mag. I rarely load the mag. Most times I insert a single shot sled, but I do want the option of follow up shots.
With that said, here's a couple of images.
215 Hybrid at touch. View attachment 1594584
215 projectile next to dummy cartridge.
View attachment 1594585
There's more than enough room for 10-ish grains of powder for subsonic use.
If, for some reason I want to shoot the 125 NBT supersonic, I can get 34gr of LT 30 underneath it. Probably a lot more if I go a ball powder.
Dangit, now I'll have to build the 30 first, then maybe the 338 down the road.
Paul