John, shooting a 310 grain NEI fixed I ended up with around 19 grains of H4198 or SR4759 but it didn't shoot as well as a lighter bullet so didn't pursue it.

frnkeore wrote on Sep 14^th, 2015 at 1:29am:

Note that 4759 has been discontinued so unless you've got a large supply, might as well go with 4227.

Gentlemen - thanks for the information & smokeless loading data...
I've been working the bullet with the Powley Calculator and with a SF - Stability Factor greater than 1.5, a bullet is at maximum stability.
From 1247 up to 1523 fps, Powley Cx says the 375292 is maximally stabilized and the minimum twist is 1:18.

Powley Minimum Twist Rate Calculation  **                  
SF      3.35            
V      1247            
BL      1.18            
WT      323            
DIA      0.381      TWIST =      18.0

I would be very comfortable with the results loading it with 42-46gr of FFg but with smokeless I'm clueless.

I had CPA ream the chamber for breech on the Uberti HiWall to have a companion bullet for the Douglas 32-40 barrel on the CPA.  The Hudson 375293 is an accurate breech bullet for the 32-40 - now I just have to get better groups out to 300yds with it.  J Louis ... I'm working on it!

I've got both 4759 and 4227, so I'll try both powders.  When Hodgdon discontinued 4759 - I bought 6 lbs so I'm good for a goodly time 

Note: Even with a 44 1/2, the 375292 cannot be breech loaded with a plugged case because the bullet is too long - 1.18".  That's why I'm looking for another breech seater vendor

John, isn't the Doc Hudson bullet a stepped design, specifically for breechseating? I have the same Ideal mold, and in my Schoyen Ballard the bullet enters the bore fairly easy for the first half of the bullet, and as it contacts the larger diameter of the bullet it get snug, and takes a bit more leverage.

John Boy,
You keep using two different number, 375272 & 375292. I'm assuming that the 292 is a mis-keyed number?

First, the 375272 was made for a 18 twist barrel. It was the only twist used at that time for 38/55.

Next, unless I've messed it, I haven't seen your groove diameter stated. If the groove isn't OVER .380 the those base bands are going to VERY hard to get BSed. And if the bore diameter is larger than .373, you get mediocre accuracy.

Best thing to do, is size the bullet to .001 - .002 over groove and try it.

Those are ideal sizes. That said, I shot a original Pope mold, of the same design, in my 33 ELCO, it has a standard .330 bore. The first 3 bands were .328, .002 under, the forth band was .001 under groove and the base band .003 over groove.

I didn't expect much from it, because of the undersize front bands but, I got a 3.1" ten shot group @ 200 with it. Not near as good as my regualar bullet but, not as bad as I thought it would be.

Frank

Quote:



This is confusing me even more John? Not sure what mold this is either? 375272 is a .38-55 mold, and never head of a 375293 mold for either .32-40 or .38-55??