UPS delivered these to me a couple days ago. I had some 300 Dakota brass laying around here so I decided to do something with it.
The case on the left is a WSM and the one on the right is a RUM.
The 270 Montana will have about 4 H2O gr more capacity than the 270 WBY and about the same as the STW.
I plan on shooting 160 -175 gr bullets in this cartridge. Matrix has 165's, 170's and 175's. Cutting Edge has a 165 that will need a tight twist. I'm expecting 3200-3300 fps velocities. RL33 will probably be the powder of choice.
This is my first wildcat other than a 6-284 and 6.5 WSM which I don't consider wildcats