Plutonius,
I also enjoy the same combination of S&W .32-20 HE and Winchester 92 in .32-20. Love them! I posted some glamour shots of mine at this thread:
http://smith-wessonforum.com/s-w-hand-ejectors-1896-1961/456661-couple-32-20s-range-today.html
I don't consider myself an expert on anything, but I will say that I have been safely loading ammunition for over 50 years. Having tried to find a perfect load for both the rifle and the revolver, I have come to the conclusion that the perfect load must be a compromise. Likely it will not be optimal in either gun.
I started by reading all loads listed in the loading manuals at my disposal and available on the internet. Of particular interest was the article by Ken Waters first published in July 1982 in
Handloader and included in his publication,
Pet Loads. It's entitled, ".32-20 Revolver." Waters reported best results with SR4756.
I tried his loads, first in the rifle. I got great results in the M92 using his load of 6.0 grains SR4756, 100 grain Berry plated bullet, a 6-1/2 Remington primer (small rifle), and Winchester brass. Then I tried this same load in my S&W .32-20 HE.
It's way too hot for my revolver. Yet he found it ok in his S&W. Just goes to show that individual guns will react differently.
My revolver seems to really like 3 grains of Red Dot behind the Berry 100 grain bullet, which is an obviously mild load. I loaded that with the Remington 5-1/2 (small pistol) primer and had no issues at all. I haven't tried this particular load in the rifle but would expect it to be on the puny side.
I'll do more experimentation, but really I don't expect to find a load that works optimally in the rifle and still can be fired in the revolver.
One last thing: Concerning the issue of whether you have a heat-treated cylinder, you must remember your S&W letter gives the date your revolver shipped from the factory, not the date of manufacture. I can't give you an approximate serial number that divides the heat-treated cylinders from those that are not. Perhaps someone here can do it. I use as an
approximate rule of thumb the presence or absence of the "Made in USA" roll mark at the front right side of the frame. The date of that mark coincides roughly with the onset of heat treatment of cylinders. Actually, I think the roll mark is slightly later, so if you have the roll mark, your cylinder is heat-treated. Somebody correct me if I am wrong.
Enjoy loading for you .32-20s. I love mine.
Curl