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Too far away to give you an hour but will pass along a few things I`ve learned.
1. Don't try to make some super duper magnum round out of what was never intended.
Good solid low to mid range rounds will give you years of fun.
2. Find the best components you can. Most of those milsurp rounds you mentioned are still being made somewhere! Even if you can only buy loaded rounds. If you have to use surplus, thourouly inspect and discard ANY questionable cases.
3. Hang out at a range and find someone else shooting a classic. Chances are they will have stuff to share/sell in a caliber you need. Buy'em a beer or lunch and make a friend!
4. Have fun!! I firmly believe old guns if in good shape should be fired and appreciated.

Best of luck!