I asked this question over on ASSRA and was convinced by Westerner that I should not renew my membership.
The 336 has been "fixed" by someone who thought you had to throat the chamber because .380s and .381s would not chamber. The result is that if I placed a 250 gr bullet in the case 1/8" deep and chambered it, I could not touch the lands.
Today I was in the reloading shop and remembered I had some tapered bullets cast for my relatively new C Sharps Hi Wall in 38-55. The bullet is an Accurate made mold designed by Dan Trenck (310DT).
The Marlin barrel slugs .379 plus a tad. I dropped a bullet in the chamber and chambered a plugged case that seats the bullet 1/16" past the case mouth. The next to the last driving band provided some resistance but the lever closed (ain't bent either). If one is familiar with breech seating, they suggest that the lands contact at least 1/2 of the driving band. The skid marks of the lands ends just before the last driving band.
As far as my education goes, the only problem I will have is that the grooves will not be sealed and gas may/should leak around the bullet causing leading and poor accuracy. I have this nagging concern that the base of the bullet is "hanging out" in the throat by about 1/8". Am I creating a mountain or does experience say "no problem".
Full case of OE FFG (50 grs by weight) and .030 wad in case mouth.