RyanM - you're killing me!
Thanks for the link ... I see... Are these barrel sleeves for a Derringer? I like the idea. The big problem that I am seeing is that some sort of catastrophic test would likely occur - because you can't exactly read the primers on a case that doesn't use them...
Basically, the 'smoking gun' would have to come in the form of a 'pneumatic hand grenade'.
I'm thinking what the key is, is to find out what powder a particularly hot .22lr uses (assuming that it is commercially-available) and then use linear interpolation and ratio to determine (using tabulated data for, say, a .25ACP) where a good start point might be with another brand of powder.
I mentioned the N310 as a candidate because I have had such great success with it in mouseguns in the past. I believe the tabulated max velocity for a 71gr bullet is about 1000 ft/sec out of a Sig-Sauer .32ACP. Using the N310, a Kel-Tec P32, Federal cases/primer and the 65gr Hydra-Shok, I got 1169 ft/sec! A maximum load with Bullseye got something like the upper 900 ft/sec range, using the same components.
Oh. Someone mentioned placing the bullets back in the case... In my experience, I have been able to pull bullets and replace them back into the cases, without too much loss of neck compression and no need to resize the cases. I like to use a Hornady collett-type puller, as it only leaves four shallow imprints on the bullet, if you do it right. Those are usually too far away from any hollowpoint cavity to affect the performance of the bullet, terminal ballistics-wise, anyhow. Impact pullers are definately out due to the shock-sensitive nature of the priming compound.