I'm dying to load up some rounds for m71/84 but the Lyman mold is $75 bucks. I can get a sizer die for my Lub-A-Matic in .446 and size down the 450 grain .457 bullets I cast for my Martini Henry. Just curious if sizing from that size down to .446 will be really hard? My alloy is range scrap and fairly soft. Then of course the lube grooves, not sure if they will swage away going down so far. The rifle has a 1:22 twist so it should perform well with the 450 grainers, would be great if I could use them for both rifles!