After selecting SR4756 for my 10mm PD reloads, I tried it in my 32.
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.
An EDC S&W M&P 357SIG. Ten Glocks sold. NRA life member.
"If lethal force is warranted and appropriate under the circumstances, the" (defender) "must shoot until the threat ceases." Pinizzotto, Kern, and Davis, FBI Academy.
Last edited by jeffreybehr; 08-11-2010 at 22:58..