Unbelievable Success! I just put a large rifle primer in my half-formed case, 16.0 Grains of Unique, filled it to the bottom of the neck with grits (store bought ones, not home ground) and a tuft of Kleenex paper (we are trying to conserve toilet paper) and took it out and fired it. Long case and all. Pulled it out of the rifle chamber, and it looks just like a perfectly formed 43 Spanish case. I mounted it in the case trimmer with a 0.432 (44 Mag) pilot and it was tight enough to trim the case to length (2.25"). It appears that the body of the 338 case is a perfect fit in the 43 Spanish chamber except for the belt. I have a bunch of 370 RCBS mold projectiles already cast up from a bunch of years ago. But they need to be put through the LAM-II to lube and size them. Then its time to fire an actual boolet! Now I need to work on all the other suggestions everyone has given me to be able to form this case more easily and more accurately, including trying the e clips to thicken and enlarge the rim. Thanks everybody for all of your suggestions and keep them coming as I adjust my forming process to make lots more of these.