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Best accuracy with full power loads?

Discussion in '10mm Reloading Forum' started by gofly, Apr 26, 2012.

  1. gofly

    gofly pistoleer

    7
    0
    Feb 29, 2012
    My old Lyman book generally cited a powder for a given cartridge as having the best accuracy with full power loads, but it isn’t very good at 10mm.


    To narrow it down, let’s make the slug either a 180 or a 200. I figure 180 as the best all ‘rounder, but get a sense that the 200 might help smooth out the velos and tighten the groups.

    From observed velocity spreads, I’m guessing it’s not BD, at least not when at full power under the 180. In the winchester sticky, there are good words about WSF under 180.


    Anybody?
     
  2. Yondering

    Yondering

    564
    0
    Dec 3, 2011
    The best overall accuracy I've gotten with any powder has been with full charges of AA #9. I also get better accuracy with 155's or 215-220gr bullets than the middle weights.
     


  3. nickE10mm

    nickE10mm F.S.F.O.S.

    4,136
    69
    Apr 13, 2004
    Wichita, KS
    I'll be doing a full accuracy workup with several of my full power handloads using both 180gr XTP's, 200gr XTP's and 200gr WFNGC hardcast bullets sometime before the fall. Too busy lately....
     
  4. WeeWilly

    WeeWilly

    3,499
    342
    Nov 12, 2011
    Idaho
    I have very limited experience with 10mm. I have only loaded 180gr FMJ/JHP. I have tried VV-N105, Blue Dot, Longshot and 2400. I just got some more #9 and will be trying that next, AA#9 is my favorite powder for .44RM.

    My most accurate loads were max book 2400 loads. The velocity of 2400 at max book is not up to some of the others on my list, but it sure grouped well from my stock G20SF.

    I have not shot a great deal of the Longshot loads yet, but it may become my new best friend powder. I really liked it the first time out.
     
  5. dsb1829

    dsb1829

    103
    0
    Nov 2, 2011
    My 20SF likes the full book load of 11.0g BlueDot under 180g XTP clone (Magnus J134). Puts out ~2in 25yd groups off of the sand bags with me behind the trigger. I am sure in steadier hands or a ransom rest it would show better. Off hand I am just not much better than a pie plate shooter at 25yd. Just genetics I guess.

    At any rate, the groups are noticeably smaller than my typical 10.4g loads.
     
  6. Kegs

    Kegs Ol 8 fingers ;)

    2,688
    2
    Oct 26, 2009
    Cold side of conus
    The best precision I've got was about 1" @ 25y with the 200gr. 1200 fps from Buffalo Bore. That is a full power commercial load. This is from the bench

    The best precision from a handload I have gotten is about 1.5" @ 25y with the 135 noslers @ 1700 fps avg. That's why I keep this round in the pistol.

    The best accuracy I get is by adjusting my sights to the center of the point of impact. :tongueout:
     
  7. OregonG20

    OregonG20

    632
    166
    Sep 5, 2011
    Oregon
    From a bench, aka hood of truck.

    1.26 inch COAL
    13.8 to 14gr of AA#9 *I made some of both, but mostly I make 13.8 now.
    CCI 300
    180gr XTP
    Starline brass

    [​IMG]
     
    Last edited: May 17, 2012
  8. nickE10mm

    nickE10mm F.S.F.O.S.

    4,136
    69
    Apr 13, 2004
    Wichita, KS
    Nice group, Oregon.... What velocity do you get with 14gr AA9 / 180 XTP?
     
  9. Taterhead

    Taterhead Counting Beans

    3,595
    107
    Dec 13, 2008
    Boise, Idaho
    Sweet group. That is a winner right there!
     
  10. Jitterbug

    Jitterbug

    870
    5
    Aug 27, 2002
    Beautiful group, I'm curious about velocity with that load too.
     
  11. OregonG20

    OregonG20

    632
    166
    Sep 5, 2011
    Oregon
    Thanks for all the compliments guys. Even a blind squirrel finds a nut now and then...lol

    They were chrono'd at 1200fps.

    I don't own a chrony, and my friends seems a bit on the slow side. All my Hornady .223 rounds were 200 fps off of the box flap, and I have a 26'' bull barrel on my rifle, which is longer than the 24'' test barrel from Hornady. I always thought Hornady is usually pretty accurate. He was getting some weird readings from his .357 magnum too that day. Could have been the setup. Or the weather. It wasn't much above freezing that morning in Central Oregon. A lot of people have run the same exact load across a chrony and swear it's in the 1250 fps range. Until I try it on a different chrony and get a different result, I am sticking to the 1200fps though.

    The 13.8gr @1200fps muzzle energy = 575 ft/lb
    If it were 1250fps, it would = 625 ft/lb of energy. I never got to see what the 14gr were doing. I assume a bit faster....lol.

    *edit* BTW, Accurate Arms reloading manual states 13.5 gr of #9 is max with 180gr XTP, and out of a 5'' barrel, they say it does 1242 fps. So, if anybody wants to take a guess at what subtracting .4 inches of barrel and adding 3 or 4 tenths of a grain of powder probably equals, be my guest.
     
    Last edited: May 18, 2012
  12. Kwesi

    Kwesi

    1,456
    6
    Sep 23, 2006
    TX
    I won't guess on the barrel but it is possible that the additional powder could result in lower FPS. There are diminishing returns.
     
  13. Jitterbug

    Jitterbug

    870
    5
    Aug 27, 2002
    I just picked up a fresh pound of AA9 and have an old box of 180 xtp's lying around I'll have to give that one a try, thanks.

    I'll stick with book and if I can get it in the 1200 fps range with that type of accuracy I'd be a happy camper.
     
  14. OregonG20

    OregonG20

    632
    166
    Sep 5, 2011
    Oregon
    Awesome. Good luck! Pics when you're done.
     
  15. 10mmau

    10mmau

    10
    0
    May 5, 2012
    I too have run the 180 XTP with AA #9, out of a stock G20sf.

    COAL 1.255
    14.0 gr AA # 9
    CCI - 300
    180 gr XTP
    Starline


    At 14.0 grains velocity averages 1180 fps. Never did any accuracy testing, and the load shows no excessive pressure signs (out of my gun) but I find that I am getting an apparent incomplete burn on the powder as this load leaves lots of powder parrticles in the chamber and bore. I have loaded up some lower starting loads again with the CCI -350 primers to see if this will help but but I would prefer not to use magnum primers if possible.
     
  16. WeeWilly

    WeeWilly

    3,499
    342
    Nov 12, 2011
    Idaho
    Terrific shooting Oregon.

    I have to say I am most impressed you could see that bull at 25yards. There was a time when I could see that well, doesn't seem that long ago...

    I finally got my powder drop to stop leaking #9 and I just loaded up a bunch of AA#9 (12.5grs to 13.9grs) under some 180gr HAPs. Get to shoot them later today, really looking forward to it, #9 has been my favorite .44RM powder for many years.
     
  17. gator378

    gator378 Gator378

    509
    0
    Jan 22, 2001
    St. Peters, Mo, USA
    With the 8lb jug you almost get a lb free when you run the numbers by the lb. Only buy in 8 lb jugs now.
     
  18. Yondering

    Yondering

    564
    0
    Dec 3, 2011
    Not with AA9 in the 10mm. It runs out of case capacity before max pressure in every combination I've tried, and keeps going faster as more powder is added, up to max compression where the bullets creep forward.
     
  19. leeward419

    leeward419

    799
    0
    Feb 7, 2010
    43.12 / 77.67
    I have taken to AA9, I beleive accuracy is a tad better than the blue dot I had been using, probably due to metering as the
    AA9 has very fine grains. My bullet of choice has been the 200HPXTP with CCI primers.
    All with max loads from AA's reloading data. These are for hunting deer
     
  20. Jitterbug

    Jitterbug

    870
    5
    Aug 27, 2002
    We'll have to dig around in here, I think others have been down the road of standard verses magnum primers with AA9. I can't recall the results off the top of my head.

    Those dang eye's do go fast don't they Willy? My problem is definition and lighting with the dang front sight.

    I do hope you have a chrono and can post some numbers.

    I cracked open an 8lb jug of TAC yesterday (2314 rounds of .223, which we go through pretty quick) and was thinking the same thing, I go through a lot of AA7 for pistol and was thinking I need to pick a favorite and start purchasing bulk in pistol powder and especially primers, at least enough to warrant the $27.50 hazmat fee and shipping.

    With my 10mm plinker load the 8lb jug is 6,363 loads...that's a lot of plinker's, lately I've been using it a bit in 9mm too so that would help.