Dave,
I had an Explora which I shot with a normal Paradox style bullet. I used the "normal" 21.5 of Unique and got 3" groups at 50 yards. Yes, these were regulated for 1500 fps but they will shoot at the lower velocities with some tinkering with wadding, crimping and powder.

Utah,
John Millar in Canada, 250-442-5616, can most likely make up the "LT Capped" bullets. I have an eight and ten Paradox and he has yet to fail making a tool or part. He is a very special machinist.
JAZ