Nice score, great little rifles. They were made from about 1921-1941. Yours may be from the later years since the stock is un-checkered. I have one in .25-20 and .22 Hornet. Your looks like my Hornet, and I bought it from the original owner who bought it new post war.
All depends on what you consider high velocity. Not sure if you can get over 1300-1400fps safely. Like all hand loads, work up gradually and stop when you see pressure signs.
Here's a good article I found about loading for the .32-20. http://www.sixguns.com/tests/tt3220.htm
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