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155 Winchester STHP and old Double tap Chrono results

Discussion in '10mm Reloading Forum' started by ctkelly, May 25, 2010.

  1. ctkelly


    May 9, 2010
    Elevation 1155 ft above sea level. 89 degrees, 45% humidity. Chronograph 5ft from muzzle, CED M2 unit.

    155 grain silvertip bullet, CCI 350 primers, starline brass new, 1.26 COL. Barrel is a KKM precision barrel, standard length for the G29.

    10 grains of 800x

    Had one error and forgot to record the ES, SD, etc.

    AVG of the 5 shots was 1255 FPS.

    no signs of overpressure clean burning

    12 grains of AA #7

    AVG 1206
    ES 15
    SD 5

    Again no signs of overpressure, fairly mild load shot very nice. Clean burning

    9.5 grains of Power Pistol

    AVG 1315
    ES 12
    SD 4.0

    No signs of overpressure, recoil was snappier than all other loads tested. Clean burning

    And for some factory Double tap ammo....that was 5 years old. 200 XTP bullet, advertised at 1200 FPS from a G20....

    AVG 1149
    ES 28
    SD 10.2

    Hopefully I can get out and do some more testing, but I have a limited supply of these 155 STHP on hand.
  2. preventec47


    May 2, 2010
    Atlanta, GA
    I am not familiar with the G29. What is the
    std length barrel for that gun?

    155gr is my favorite bullet weight in 10mm for
    self defense

    Since you used 12gr of AA#7 I thought you
    might appreciate seeing that the load manuals
    all list a higher max weight for that load.

    Here is what the manuals say for 155gr MAX
    loads but not specifically your bullets.

    [FONT=Times New Roman, serif]ACCURATE ARMS #7 & #9 Powder[/FONT]
    [FONT=Times New Roman, serif]155gr XTP 12.7 AA#7 1379fps 37,500psi Accurate Arms 3.2.2[/FONT]
    [FONT=Times New Roman, serif]155 XTP 13.9gr AA#7 1400fps Hornady 4th edition[/FONT]
    [FONT=Times New Roman, serif]155 XTP 15.1gr AA#7 1450fps Hornady 7th edition pg 861[/FONT]
    [FONT=Times New Roman, serif]155gr Jkt Silvertip12.5gr AA#7 1324fps 29,800 CUP 2010 Lyman manual[/FONT]
    [FONT=Times New Roman, serif]155gr TMJ GDHP 13,0gr AA#7 1320fps CCI 300-350 Hornady Case, Speer #12 manual[/FONT]
    [FONT=Times New Roman, serif]155gr 15.9gr AA#9 1414 fps 32,700psi Accurate Arms manual 3.2.2
    155gr Jkt Silvertip 15.5gr AA#9 1343fps 27,900 CUP 2010 Lyman Manual
    [FONT=Times New Roman, serif]155gr 13,0 AA#7 1320fps CCI 300-350 Speer #12 manual[/FONT]

    [FONT=Times New Roman, serif]> Hodgdon manual-------------------------
    > 135gr Autocomp 9.5gr 1476fps 34,500 psi is a Winchester powder
    > 155gr Autocomp 8.9gr 1362fps 35,700 psi is a Winchester powder
    > 155gr IMR 800-X 9.8gr 1350fps 30,000 psi

    [FONT=Times New Roman, serif]A snapshot of an old IMR load manual page ( date unknown) shows[/FONT]
    [FONT=Times New Roman, serif]155gr Rem JHP Rem 2 ½ primer 11.6gr 800X 1475fps 32,900psi 5” barrel[/FONT]

    > Alliant Data---------------
    [FONT=Times New Roman, serif]150JHP 9.7gr Power Pistol 1415 fps fed 150 primers 1996 manual
    155 JHP 11.5gr Blue Dot 1340 fps Fed 150 primers 1996 manual
    155 XTP 12.7 Blue Dot 1350 fps Hornady 4th edition
    [FONT=Times New Roman, serif]155 XTP 12,9 BlueDot 1450fps Hornady 7th edition manual
    155 Speer GDHP 12gr Blue-Dot 1291 fps 2010 Alliant website
    [/FONT][FONT=Times New Roman, serif]
    [FONT=Times New Roman, serif]
    [FONT=Times New Roman, serif]10mm Bullet Lengths------------------[/FONT]

    [FONT=Times New Roman, serif]Nosler 150 JHP .535 “[/FONT]

    [FONT=Times New Roman, serif]Hornady 155 XTP .555 “[/FONT]

    [FONT=Times New Roman, serif]XTREME (solid double plated) 155gr .512 inch[/FONT] [FONT=Times New Roman, serif]

    [/FONT] [FONT=Times New Roman, serif]
    [FONT=Times New Roman, serif]
    Last edited: Jun 7, 2010

  3. ctkelly


    May 9, 2010
    3.78" is the standard length for a G29.

    I did not have access to loading data for the 155 Silvertip specifically so I started low. It is ill advised to take load data from 155 to a different bullet brand and expect it to work okay....For one example, the base on a silvertip is flat....the base on a GDHP is dished and in theory could handle more powder behind it. Further more I am willing to bet none of those manuals are using the CCI 350 MAGNUM pistol primer either which adds in another variable to testing.

    I have advanced to 12.5 and 13.0 grains of AA#7 behind the silvertip and will chronograph as soon as the weather cooperates with me. I also have some 155 GDHP loaded with 10.3 of IMR 800x which was one of Mike McNetts most accurate loads according to him. And lastly, 10.5/11.0 grns of aa #7 behind the nosler 180 JHP. All of these are ignited with a 350 CCI primer and the GDHP/NOSLER loads will be using my new top brass I picked up from on averaged weighed 4 grains more than the starline.....should be interesting.
  4. preventec47


    May 2, 2010
    Atlanta, GA
    Thanks very much for your detailed and objective reports
    that we can all learn from.

    It is why we are all here.
    To share what we have learned the hard way and to
    more easily learn from others what they have learned
    the hard way.