Cat,
No, I haven't tried it at all. I'll never know if it totally seals unless I take the GC off it and since I have a double cav in the same bullet, I'll be able to to try it all three ways (PB, w/o GC and with GC). I don't think it will loose much value modified (they sale for about $65 on Ebay), it may even increase the value for guys like us. I also have a 8mm Mauser to try it in.

Mike,
Thank you very much for the load data.

Frank

Frank I have a Single cavity #323366, will try to re-cut the base band to a boat tail shape, nice part is if it does not work, I can cut again to plain base.

I have the # 38 B&M hand book (1958) it only list Lyman moulds, did B&M make moulds or have Ideal/Lyman make moulds for them to their specs? 

MIKE-T

The bullet is simply a boattail - no GC.

The mould could well be Lyman.  Only markings are on the edge - B&M and 311193 each on one half.

The bullet is shown and detailed on page 36 of the 1925 Belding and Mull catalogue 311193. 311 dia. 193 grains weight cast in no. 3 metal? Guess they has their own alloy formulas.
Suggested load was 17.5 grs. weight of no.80 powder.
So it was available as far back as 1925.
They also had boat tail cast designs for other cals.

Cat_Whisperer looking in my old loading log for my 32/40W loads using the 323366 bullet, I found that originally I had used 1 gallon milk jugs for plastic material to make wads for under the breech seated bullet, did not have any negative notes about results so it might be worth a try, and the price is right.
MIKE-T