Quote Originally Posted by Jbotto View Post
So instead of making a new thread for this topic, I'm going to jump on this one, as I am getting close to the end of a .280AI build and if I get some time, I'd like to get some rounds to fireform. I can't remember where I read it, but I have heard a good way to fireform rounds is to use a recipe of the parent load, that is halfway between starting load and maximum. Can anyone confirm this? I have a few hundred cases of once fired .270Win brass, that I am planning to run through a .280 FL sizer die and then load them as .280. Cheap brass to start with for the barrel break in process and the beginning steps to reload for this new-to-me cartridge. Those with experience with this round, what are your thoughts on this?
I’ve never used once fired brass, always new for fire forming. The best way I have found for fire forming is to seat your bullet into the rifling so that the brass is pushed up against the bolt face. This ensures that all of the case stretching is forward, so as not to weaken the web area. I use a medium load of faster burning powder to send the bullets.


JTD