Bwana:

You're right, it certainly hurt nothing. Much better to start where you did than higher.

For old Kynoch ammo, search the web. Kynoch loaded the .500/.465 regularly until the early 1970s. Stuff that late ususally isn't too hard to find. CFA got two sealed 50 round bricks with his new Holland, from '66 and '67 IIRC. Certainly try Lewis Drake as he usually has a variety of old Kynoch laying around. The latest stuff will be from IMI, as opposed to the older ICI.
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