I have a few 358 caliber molds. I could fire form like Rifle Crank wrote only using cast bullets or size the cases to 375 and the neck back down to a crush fit. When forming cases for the 375 Whelen AI I tried expanding to 416 and then back down for a crush fit and I tried fire forming with bullets pushed into the rifling. They both worked. I lost one case by going to 416 and then back down to 375.
Right now, I've grinded out some of the glass bedding in my new prize and am re-bedding it. I didn't like his bedding job.
If I get 50 fps faster than a standard Whelen I think that may be about it. I don't think I'll be trying to get 200 fps. In fact, top velocity isn't that important to me.
I may likely put a low power scope on it and shoot mostly cast bullets in it at any rate. It's a little heavy, I should weigh it...
