Attempting to replace a magazine in a Winchester 1895 in 35 Win. Have looked at various magazine housings with different letters stamped on the front mounting plate left side. Anybody know the significance of the letter? We observed "A", "B" and "E". There may be more. Know that the carrier, cam and follower is specific to a caliber and have that info. Any help is greatly appreciated.

Ron(Canada)

Here's what I have so far.

"A" ?
"B" ?
"E" 30-06
"F" 7.62 Russian

would like to know letter stamped on left side front for 35 and 405 Winchester.

Ron (Canada)