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After selecting SR4756 for my 10mm PD reloads, I tried it in my 32.

Discussion in 'TOP GUNS *357 Sig* Club' started by jeffreybehr, Aug 11, 2010.

  1. jeffreybehr

    jeffreybehr Silver Member

    765
    3
    Mar 14, 2009
    Phoenix, AZ USA
    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.
     
    Last edited: Aug 12, 2010
  2. jeffreybehr

    jeffreybehr Silver Member

    765
    3
    Mar 14, 2009
    Phoenix, AZ USA
    Good news, friends--I have a higher-velocity, lower-flash, more-accurate PD load, and I'm now carrying it.

    After evaluating* 5 different charges of 4756 with the XTP124, 8.9 grains proved slightly better than others. This load develops 1407FPS from my 4.5" barrel (sample size 15; screens centered at 10'); the Gold Dot LE #54234 load produced 1354FPS from a sample size of 21 shots.


    * with seven-each 5-shot groups over 2 days
     
    Last edited: Aug 15, 2010

  3. blackbmw

    blackbmw

    1,601
    0
    Aug 29, 2008
    st. louis
    The sig load is kinda watered down, go with CUP specs and watch the numbers grow drastically. Im getting 1560fps with buffalo bore 125gr ammo out of a G31, when i reloaded i acheived slightly higher due to the fact that i can adjust all variants of the round.
     
  4. Sounds like that might be a powder to try with the longer Barnes bullet if XTP's ever get low in supply.