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Old 08-11-2010, 17:28   #1
jeffreybehr
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Join Date: Mar 2009
Location: Phoenix, AZ USA
Posts: 776
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.
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Last edited by jeffreybehr; 08-11-2010 at 22:58..
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