The 53gr didn't really fit in the case. When I dump the powder in the funnel it would fill the case and there would still be a little left in the funnel, but h414 being a ball powder I was able to tap the side of the case making it settle enough that I would have a small gap where I could set a bullet for seating, and then I would get some powder crush when I seated it!

I would like to change it to a AI too see how much more speed I could gain, but I don't have a 243ai reamer or dies for loading...