I found only 2 reputable sources for loads with 124/125g. bullets, and, as usual, the max loads varied somewhat; Lyman's is 8.7g. for 1293MV, while Hodgdon's is 9.1g. for 1376FPS, both with 4" barrels. I assembled five 5-round batches--Speer nickeled once-fired cases, 124g. MontanaGold HP, and WSP primer--for initial testing. Resulting velocities were higher than I thought they'd be; from my 4.5" barrel, the average with 8.3g. was 1360FPS (with screens centered @ 10'), while 9.2g. produced 1429FPS. Primers are still radiused at 9+ grains and functioning was perfect, so I'll now try these with my favorite bullet available ro reloaders, the Hornady XTP. SR4756 won the muzzleflash wars in my 10mm--see http://jeffreybehr.zenfolio.com/p548446203 --so a load with 4756 and the XTP124 may give the Speer GDLE load #54234 some serious competition. More later.