Jake:
Don't know how they'd fit a case. BUT: if they will and the bore/slug dia's match up.
Take a good look at the Lee REAL slugs for M/L's.
In my .54 a 300gr will turn a touch over 1800fps.
That's what I'd like to use if the range was within reach. Since it's not, been using the .300 Win.
IF I ever draw a deer tag again, where we hunt elk there's quite a bunch of nice bucks that are not very wild. Some really fine big racks the last few yrs. They just stand and watch us, even walking to a stand like they know deer season ended last Friday and now it's elk season so we're not in danger.
Had a 5pt watch while Jess walked about 200yds and set down, then went back to feeding. Buck wasn't much over 100yds out he claimed. I've seen several 4pts like that.
That's what I have in mind for the tag once I draw one. Looks like next year should be assured with 4pts now. Since they changed it back the way it should be. will go for deer one season and elk the next. OR that's the plans anyway.
During a bench test I hit first shot every steel target out to 175yds. The 200yd RAM took 5 to hit, but, made a 50 cent sized lead disk, so it's hitting hard enough even that far. But, the range is too far for it. That was my testing to learn the gun and loads right after I got it. My first M/L. I went with the 300gr because of the velocity gain over the 400gr. I figured a 300 gr is more than enough for a bull elk if he's within range.
Lee makes a REAL in two sizes for .45's too. Shoot fine in my m/l pistol.
George