Well, GOOD--we didn't scare you off. That does happen from time to time.
Some "Ground Rules" or definitions would help. In the context of bullet casting, whether for handguns or rifles, "Small Caliber" tends to be any caliber under .300". The availability of moulds for calibers under .3" dwindles greatly. I have a fair number of these, in 22--24--25--26 calibers. Most are Ideal/Lyman or RCBS. I would rate my successes vs. failures as very much right-side-up in 24, 25, and 26 caliber. The 22s.......well, it's uneven.
22 Hornet--pretty decent, but not stellar. I can get to +/- 1.5 MOA at 100 and 200 yards with Lyman #225438 at 2350-2400 FPS, J-words group 0.8-1.0 MOA from this same rifle. This performance was NOT influenced noticeably by metallurgy--both Linotype and 92/6/2 alloy did about as well at higher velocities. Scaling of bullets vs. HARSH eyeballing of casting quality didn't make a discernable difference either. Lino DOES cast some gorgeous bullets, though. The Hornet's 1-16" twist rate plays a significant role in enabling higher velocity.
223 Rem--Real uneven. As long as velocities stay below 1800 FPS, all is somewhat well in the 1-9" twists, once past that speed things go to h--l. Lots left to do here. One step forward, two steps back, more often than not. J-words do so well in 223 that I wonder if castings are worth the trouble in this caliber.
22-250--Not a lot of work with this caliber, but the work done has been encouraging. 1-12" twists in both of my rifles, which seems to be very cast-friendly so far. I have sent #225438 to the 2000 FPS level with fair accuracy (1.5-1.7 MOA), the RCBS 22-55-SP is more load-sensitive but has run to 1700 FPS with a few powders giving 1.3-1.5 MOA. When a powder/load doesn't work, the 22-250s are not coy about showing it. UGLY+.
All of the above bullet are sized @ .225" and lubed with LSS Carnauba Red. Yeah, I'm a Luddite--so sue me.