Ernie : Yes it's basically a belted 6mm-06. Case body in front of the belt measure. 453 so it's a little smaller than 06. The problem I've run into is looking online there seems to be a lot of opinion on Weatherby calibers being too much for the encore frame. I can understand the bigger H&H and 378 cased ones but can't see how the 240 being 06 sized would cause much trouble. I did ask the folks at Bullberry (before they changed owners) about some of this and was told the 240 was fine but just be sensible about loads.I'm a big Weatherby fan so that's the main reason for having this setup.