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The last reloading manual I have that lists Winchester 450LS powder is the Speer number 8 manual published 1970.
You will have to call TC to find out.
Contact T/C customer service through their website.
Thompson Center has no official published serial number list, but I can usually tell a general age by the model and serial number. The model is in most cases engraved on the barrel, ie Cherokee, Seneca, Hawken, New Englander, Renegade etc. and the serial number is stamped on the barrel itself or on the breech plug. You can also contact Thompson Center directly and they may be able to help.
Whatever the reloading manual has in it.
Brass, primers, powder, projectiles, powder, reloading manual
Follow the recommendations in the owner's manual.
There are hundreds of possible loads, depending on WHICH powder, and WHICH bullet. Rather than give you a load, we would rather refer you to a good reloading manual. Lyman makes a very good manual. The amount of powder must be correct for THAT type of powder AND the weight/type of bullet used.
Follow the instructions in the owner's manual.
try the Kittery trading post
50-350 depending on specifics
Acquire an owner's manual.