I have no experience with bullet design. I want a 200 grain mold for hard cast 10mm bullets. I am a fan of the Keith designs. I do have experience casting bullets. Up to now I have cast .401 175 gr SWC TL from Lee two and six cavity molds, .358 158 grain FP from a Lee six cavity, and .429 240 gr SWC GC from a Lee two cavity. My alloy is similar to WW with magnum shot. BHN air cooled is 10.5, water dropped is 28, 30 bullet average with a Lee tester.

At this point I am thinking of ordering a 3 cavity mold from Mountain Molds. I have used the online design tool he has and created a keith style with the following specs:

200 gr (WW) Sensible Keith
.401 Cast Diameter (All bands)
No Crimp Groove
.370 Nose Length with a 70% meplat
1.0 Groove to Band length ratio
OAL: .679"

Questions:

Any thoughts or recommendations on overall design?

Should I have 1 body band (single large lube groove) or 2 body bands (2 smaller lube grooves)? (I will be trying both pan lubing and LLA. I hope to shoot as cast without sizing.)

Any thoughts about Mountain Molds? The guys over at cast boolits speak highly of him.

Thanks in advance!

Tanfoglio Witness full size and a Witness Elite Match.  The full-size is my normal carry gun.

It will reliably feed stuff with a COL of 1.260.  I haven't pushed beyond that, but imagine I could.  I also haven't measured the mags to see what the max clearance is.

Looking at the above, measuring pixels and using proportions, I can't see that slug weighing much over 185 grains.  I calculate a OAL of 640, with a meplat of 70%.  I would think if those numbers are correct it should function in my guns.  But it is a little shy on weight.

I drew this using the Mountan Molds site.  .403 and 200 grains.