I have a barrel blank stamped .311 and twist is 1x20 and would like to have it chambered for the 32-20 cartridge. Standard bullet weight is around 115 grains. And have a single cavity lyman 311316 gas checked mold. But would like to know if either heavier or longer cast bullets could be used in this barrel. Thank you, Frank

I have a ubirti low wall with 1 in 20 twist. it shoots the lyman 3118 very well. no bull I have shot groups of under an inch. ( not often but once in a while ) I am not as good a shot as those who can shoot 1 inch or less on demand.  if I were going make a 32-20 I would sell the 1 in 20 barrel and opt for a twist that I could shoot heavy bullets in. the 32-20 cpa has turned in some great scores, and the main difference is bullet diameter. there are so many good 30 caliber bullets I think it would make a great combination.  if you haven't read the following you might want to take the time to take a look 
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that said I am not unhappy with the ubirti I just would like to shoot heavier bullets if I wanted to.  joe

While I would dearly love to have one of the CPA rifles being retired, on a budget and having two daughters getting married this year kinda puts that out of the equation. Never had the opportunity to see one of the CPA rifles in the flesh but having seen some of the members here I'm truly envious. But am concerned about doing a 30-20 on a low wall action. However I have one of the BSA 22rf martinis along with a complete center fire trigger assembly with frame and lever and breech block. Argie 1891 is truly giving me a serious case of the wants. And Frank thanks for doing the calculations. And all of you who responded. Many thanks. Frank

What are your concerns about a 32-20 in a low wall?  It was an original chambering in low walls.

Schuetzendave wrote on Mar 9^th, 2016 at 1:23pm:

Winchester's catalog No. 82 (1920 Edition) didn't yet list the 32-20 Winchester with the 80 grain SP at 2100 fps.
That catalog does show the old standard 32-20 with the 115 grain bullet loading at 1222.2 fps,
and the Model 92 Special 32-20 W.H.V. with the 115 grain bullet loading at 1636.0 fps.

Many thanks to all who responded to my post regarding the longest/heaviest bullet that can be used in a .311 bore barrel with the 1x20 twist. Didn't expect that many responses. Thanks again. Frank

All four of the above 32-20 Hi-Vel ammo brands carry warnings on the boxes against use in the Model 73 and revolvers.
Remington mentions that theirs is suitable for use in the Rem Model 25.
The Winchester box notes that theirs is for the Win Models 92, 53, and 65 (the 53 and 65 being variants of the Model 1892 design).
All four brands do NOT mention suitability for use in the Win Single Shot.
One other note:   Some have a HV added to the 32-20 headstamp, some have a WHV added to the 32-20 headstamp, and some have the exact same 32-20 headstamp as found on the standard 1200fps loading WITHOUT any additional marking to indicate that they are Hi-Vel loadings... you have to recognize the Hi-Vel bullet in order to be able to differentiate between the various loadings.

Douglas doesn't always have that particular barrel blank on hand (as I found out when I ordered one in cylindrical some time back), but they got it made up and shipped out pretty quick.