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10mm with 1.39 OAL

Discussion in '10mm Reloading Forum' started by JTknives, Sep 5, 2010.

  1. JTknives


    Dec 1, 2009
    I have been playing around with loading a few rounds very long. At around 1.39 with the 200gr XTP i am .01 off the throat. but i tested it with 800x and beleve that the powder does not like this loading. i think its because im getting a spike in pressure because of the increased case capacity and more powder. i think i need to drop to a slower powder and then re work up. I'm thinking something like Lil'Gun as it seams that it works amazing in the 357mag. does any one have any sajestions on powder
  2. JTknives


    Dec 1, 2009
    I have also been thinking about using VV110 as it seams to be just a tad bit slower then AA#9 and faster then Lil'Gun

  3. Meathead9


    Aug 23, 2009
    The PRK
    I don't know about loading them that long, but maybe try Alliant Steel. I'm working on a load with Steel for my 200gr WFNGC's @ 1.26-1.27. It looks like it's also between AA#9 and Lil'Gun, and MCNETT posted some data for it a while back in the Alliant sticky.
  4. MSgt Dotson

    MSgt Dotson

    Sep 30, 2006
    How much case tension can there really be with .15" less bullet friction/contact within the case?

    Once you adjust your load to the new 'improved' case volume, and the bullet suffers .25" of setback...well, I recommend some gloves.... and perhaps a welding mask....

    Unless of course you are using the 610 least then you needn't worry about setback.... :)
  5. CanyonMan

    CanyonMan In The Saddle

    Jul 26, 2002

    I been loading pretty hot 180gr loads with BD and AA # 9, all are loaded to 1.260. G20 stock barrel. Accuracy is VERY good NO feed problems at all.

    I will say the faster I pushed the AA # 9 the worse the spreads got. I had to back off to 13.5grs AA# 9 to get the groups tight. AM barrel I have not tried yet with these. Just saying I never have had much luck loading longer than 1.260 (personally).


    I been using the Cast Performance 200gr WFNGC for a veeeerrrry long time in OEM barrel, and 10.5/10.7gr BD (i won't share how far I really go with it to cover my six here) ;) and 1.260. I have got great accuracy out at 100yds.

    Have fun with it and sgood shooting.