Good Morning,
Among others cast boolits I cast for my 10mm auto SW 1006. I have been using an ancient Lyman sizer and a .401 Lyman die. My 6 hole Lee mold drops nice boolits with a diameter of .4025 and very round. My alloy hardness runs about BHN 15. Boolits sized with the Lyman .401 die come out exactly .401 and very round. Sizing from .4025 to .401 is effortless for the Lyman. These boolits are accurate in my SW and I have never had any leading.
A couple of days ago I aquired a new Magma/Star sizer and a Magma die marked .401. The sized boolits are .3995. This is not what I wish from a .401 die! Also, sizing from the cast diameter of .4025 seems to be straining the Magma. I did the trick of running a lubed boolit through about every 15 boolits and that does help but I am concerned about straining the Magma sizer and possible breakage. So, my questions are:
1) Has anyone else had an issue with Magma dies sizing too small?
2) What would be a good way to open up the die a bit?
3) Is sizing from .4025 to .3995 with BHN 15 too much to ask of the Magma/Star sizer? Perhaps it will be happier with a true .401 die.
BTW, a boolit came with the sizer that was presumably run through the .401 die. It measures .3995 just as the ones I sized. I have not yet queried Magma about the die issue as I just ran boolits through it for the 1st time last evening. I will call Magma later today.
Thanks in advance for your comments.