You probably already know about it if it is still around but there was a lens set-up for your back sight to bring your front sight in focus. I think they were custom ground but I am reaching into long lost memory.
The federal match ammo reminded me of a bench match long ago. I was wrestling with my sporter, couldn't make it hold in a #3 washtub at fifty yards. As usual, hard to tell if it was me, the gun itself, the ammo, or that snake stretched out on top of it! I had stunk up the Sporter or Factory class as expected. With Unlimited coming up I would be shooting against the best of factory and custom rifles, even a few rails on the line. Those were like super precision miniature artillery pieces.
Instead of shooting my Suhl, I borrowed a friend's sporter that was essentially just like mine. When the smoke cleared my friend was well back with his rail, I had shot my way to second place with the factory rifle. When I brought the rifle back to Carl it was with two boxes of the UM1-B or whatever that Federal was called. "Here, your rifle likes this lot number!" I still have that Federal match ammo around. I paid about eight dollars a box for it. At today's prices it is fine plinking ammo!
Another brag with that ammo, I shot five 5 shot groups with a factory 452? CZ. Not just the aggregate, I kept every group under an inch at a hundred yards. Nothing for a centerfire bench gun but that was shooting for that little gun!
I had a world of fun shooting rifles and never found a better bunch, or better bunches to be more accurate, than the guys shooting rifles. I never shot across the course but through a fluke I knew about two dozen of the very best. That mailing list had about two people that hadn't won world championships or set records, maybe both. They respected that I used the scientific method and worked things out for myself just like they did. That was about all I had in common with these guys!
Hu