I like the challenge of 22's and 24's. Have a Sing #3 in KHornet, a Sav single shot in Hornet, a 222 on 721 Rem action, and have shot out my heavy bbl Sav. 223 after over 5000+ rounds, and am now loading for one of the veryi earlyi Sav Axis 223. Have 10 or more 22 molds of various denominations, GC/PB/HP, some in combinations. They are in a world by themselves as far as casting, and a 20 pound pot produces a whale of a lot of projectiles. I have had good luck with 225415, and same in HP. Also have had great luck with 224438 both palin and HP.
If there is any secret to casting 224't is is in keeping the molds hot enough. That is particularly true with the little HP's, and getting complete nose fill outs. I do the lions share of my casting via bottom pour, from a 20 lb. RCBS. However when I am casting little HP's I use a ladle, and a 10 pound Lyman and pour an adequate amount to overflow the mold and keep it adequately hot. Slow but rewarding.
I weigh all 22's and 6MM's to EXACT weights (sized/checked when applicable and lubed) and segregate accordingly in plastic craft boxes with dividers. It is interesting when weighing and sorting to see the bell shaped curves of the weighing and sorting process. In general I will have a bell curve of about 6 specific weights. The lesser weights on either side of the curve go into either the cull compartment or in the remelt can. I size to both .225 and 226 depending of what the rifle and load seem to appreciate most. The only 224 that I really have had trouble getting it to shoot is the old Lyman 225450, and that it because I do not have a proper seating die that will accomidate the sharpness of the bullet nose.
Ben has gotten me into shooting a lot of PB bullets, and I am searching for proper loads for the little 37gr. NOE with emphasis on Hornet and KHornet. Have the molds for both PB and Jacketed, and once the weather breaks hope to get some serious testing done with both species of the little 37 in all 4 rifles. (Sure glad I bought them back when) I am very pleased with the results Jim has had with the 55 Lee GC. I had a problem with the first 6 cav I had with that bullet, sent it back got a new one from lee that casts like a charm (along with an admonition that I not bang the blocks, which I have never done).
I have over many years, shot many very decent groups with all of these rifles at 100 and 200 yds with GC's. A few approaching 1" at 100 and close to 2" at 200, mostly at vols around 2100-2250. That would not be great for jacketed projectiles, but I consider it very respectable for cast for a codger with old eyes.
I usually seat initially to lengths listed for specific bullets in the Lyman manuals, and often have found them to be quite accurate. If accuracy is not up to desired levels, I will start moving the bullet out until I touch lands than back it off a small bit. I have been fond of Lars Can Red for summer time shooting at temps in general above 40 degrees, but below that CanRed lubes open groups drastically. Or at least that is my opinion. So for cold weather shooting much below 40 degrees, I have been using Lars 2500, with good success as well as some home made green lube that Brad made for me, and it works very well. I am getting ready to test some BLL only loads on the Lee 55 grain GC, and also some of the same with CanRed, but with BLL overcoat. Was somewhat reluctant to try BLL, but now would not be without it, and overcoat all of my cast bullets with it. Love Ben's tinkering with every thing pertinent to casting and shooting cast.
Lastly, anyone who is attempting to master casting, loading, shooting, 22's and 6MM's should (must read) The John Goines (Beagle) 3 part article on shooting cast in 223. I reread it quite often, and consider it to be gospel when it comes to shooting cast in 224's. For those who are just attempting to load accurate loads for 22's and 6mm's, I hope you have great luck. They have always ben a challenge to me, but rewarding when the challenge produces desired results.