SUCCESS!
Will edit the post with some pix and some velocity data but DALE RULES!
So the mag primers were the problem.
All data at 25 yards. Wind blowing at 45 deg, at 10+ MPH.
Started with a significantly dirty barrel just to make matters even cloudier. Shot 6 barrel warmers, 21 gr of 2400 on STANDARD?MAGNUM Winchester primers on untrimmed cases with some unknown WW alloy 429421's, softer with White Label Lube and sized to 431. Shot six rounds for a sub 3/4 inch group. HUH??? So there is some value to a STD primer with old 2400 and the right bullet. 1411, 1426, 1403, 1426, 1414, 1409
Ran the dose up to 22 grain (WITH CCI550's), 2.25 inch group for three shots. 1477, 1446, 1475
Up to 23gr, sub 1.25 inch, 4 shots, 1518, 1542, 1498, 1502
Up to 23.5gr, group fell apart bad, 1564, 1543, 1545. Impact point moved dramatically, for no apparent reason.
Moved to Win 296.
Lee 310GC, White Label Lube, CCI 550's for all strings. Seated long.
5@ 20gr, 1251, 1256, 1273, 1257, 1233 with 1.5 inch group.
5@ 20.5gr, 1295, 1273, 1285, 1264, 1284, with 1.5 inch group.
5@ 21gr, 1348, 1350, 1317, 1316, 1308 with 1.25 inch group, real round and nice.
5@ 21.5gr, 1355, 1352, 1376, 1380, 1288 (uncalled flyer????????) with group opened to 3 inch.
Now at this time, I have leaded the throats visibly on at least two of the chambers. I had not cleaning gear with me. And at this time my ability to hold and tolerate the abuse is done. 6 months ago I had a complete forearm muscle separation, which has not and will not be repaired. I have two funky balls of meat in my arm and have recovered but my trigger finger when the arm is NOT fully extended tries to use a muscle that doesn't exist any more. And so my arm tires fairly quick now, 6 months ago, I was immortal with heavy recoil from ANYTHING. Now my arm looses it's ability to hold the weapon and I get that tearing kind of pain. Thats where I was with the end of 296 testing.
I believe the leaded throats are causing some errors in the actual velocities clocked. It seems like there is consistency to 3 good clean shots with ES of under 5, then two break out. I will clean the gun tonight and verify my suspicions. I bet I have three chambers trashed and 3 clean. I probably pushed the unknown alloy 429421's too hard for the BHN of the 20 year old bullets. (got them on a reload gear buy unexpectedly, were unsized and looked pretty good, just very soft)
I was able to take a line break and get the last bit done.
H2400, really old (late 60's production), CCI550's, Lee 310GC, White Label Lube Seated long.
5@ 13gr, almost no recoil, like a 38 special target load. 885, 880, 839, 855, 861, about 1.25 inch, but so low and right that I was off the target and on the backer board.
5@ 14gr, 987, 942, 943, 942, 916, 6 inch group. Now cutting high by 3 inch and centered above bull. DYNAMIC heh?
5@ 15gr, 1081, 1095, 1078, 1067, 1085, 2.5 inch group, all deviation was in windage, horizontal--- Wind was getting fierce and I was not timing shots between gusts.
5@ 16ge, 1176, 1171, 1180, 1161, 1178 (NICE!), 5/8 inch of vertical, 1.5 inch of horizontal, one called low shot, my bad. Group was tightening up, vels are very good, I wasn't doing my part at this time and 16 gr was a GOOD performer.
Win 296, simply awesome. 2400, up past 16 I believe it will close the gap and work much better, but performance will not be where 296 is for sure and I don't think consistency will be on par.... but the last string was lower ES that the 296.
All doses machine charged on a Uniflow. I skipped critically measuring each drop. Didn't feel I would need or see the added value.
All shooting was with OPEN SIGHTS and without my glasses on. So a better shooter would generate better groups.
Bottom line is that I did find the correction or better said, impairment in the 2400 loading data. It needs the mag primers. Yes I did get good performance from the foulers, really good performance. Can't answer why the Win StD's worked so well with 429421's and 2400 but it did. It didn't do well behind the 300 grainers... thats seems to be a consistent fact offered by most shooters documenting online. Seems like ALL shooters using the lee 310, always use 296/110. And the 429421 shooters seem to lean to full power from 2400 and not 296. It is an interesting split. Then most accuracy shooters are running fast powder, like Unique for practice and bullseye type work.
So I think the lesson I can take away.. to date.. is that when you need big bullet performance, go with 296/110. When a 240/250 is used, 296/2400/110 for full power, faster powders for light shooters and bullseye.
Seems like I should know that but again, I have used 4227 for almost 30 years, for full house loads. It's not a ball, burns clean and at lower pressures/temps, really cant overfill a case in MOST CASES, ACCURATE AS HECK and is happy with STD primers at ANY CASE DENSITY. And so...
Thanks to all that chipped in some info, especially to Dale.
Gotta ask though Dale, are shooting that playing card @ 100 with a scope? I took the Leupold off so I could pack it on my hip and still carry a rifle for deer this year. I can put alot of ammo on a playing card at 100 with a scope, not sure about this 44 though. If your doing it open sights, dang man you are scary good.