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DoubleTap .40 Barnes TAC-XP

Discussion in 'Caliber Corner' started by mgouldsr, Jul 6, 2010.

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  1. mgouldsr

    mgouldsr

    12
    0
    Jan 9, 2003
    Arizona
    Just tried the Double Tap 140gr. .40cal Tac-XP. Box shows 1240fps from a 4"
    bbl. Web sites states, Expands to .83" and penetrates 13.75" in 10% gelatin.
    This round has by far the biggest hollow point I have ever seen, it's all copper and reports are that it performs very well against barriers. It functioned perfectly in my G23 and accuracy was very good, and it was suprisingly mild to shoot. I was also shooting some Win white box for practice and I have to say the Win actually felt hotter. I have fired a lot of double tap and corbon and this is not what I was expecting. Very impressive to get this kind of performance with so little recoil. Price is $50.00 for 50 rounds vs Corbon $35.00 for 20 rounds and you get a little more velocity from the DT's.
     
  2. UnTainted

    UnTainted

    282
    0
    May 8, 2007
    Idaho
    Sounds like good ammo. I've looked at buying the 125 grain load for the 40.

    Anybody chrono these new loads yet?
     


  3. mgouldsr

    mgouldsr

    12
    0
    Jan 9, 2003
    Arizona
    Ballistics : 125gr. @ 1390fps / 536 ft/lbs- Glock 23 (4.0"bbl)

    This is new on the web site, looks promising.
     
  4. gatorboy

    gatorboy

    4,078
    166
    Jul 26, 2001
    It's pretty nice
    I shot the 125 and 140 from a 22, 23, 27 and M+P 40c the other day in addition to the 125 and 155 from a 20. My thoughts on this ammo is it's extremely light recoiling due to the long length of the bullets and the amount of case space left. I did some tests in water jugs, through 2x4's and a thick plastic 55 gallon drum. They penetrated well but not as well as a good bonded 165 or 180. My fiance' was with me and we both agreed better SD loads for the .40 do not exist for recoil shy and weaker or smaller shooters. I find the velocity claims hard to believe because despite the light bullets, there just is'nt the case space. I've got good, young ears and I can shake loaded ammo next to my ear and hear the powder move. Not so with these, the powder is definately packed tight with the Barnes bullets. That is O.K. with me though. I wanted to see the difference in weight between 14 rds. of 180's and 14 rds. of 125's. It's about 2oz. - a noticable difference after 12 hrs. of IWB carry. The 10mm is the best with these IMO because you can still get some good velocity with the heavier bullets. The 125 appears to be the same length as a GD 165 which is why I find it hard to believe the 125's are going 1390 fps from a 23, light recoil aside. I could see 1250 being possible but who knows, I did'nt have a chrono with me.
     
  5. BOGE

    BOGE Millennium Member

    4,622
    0
    Mar 21, 1999
    How does bullet length affect recoil? It doesn`t in such a small sample as a handgun bullet. Yes, in a cannon there are friction coefficients but not of any discernible measure in a handgun when the weight is the same as a given lead projectile. Also, what you hear by shaking a cartridge has no relation to velocity whatsover. Manufacturers use proprietary powder blends not available to the consumer. It is not blackpowder.
     
  6. I would like to see McNett's gel calibration numbers with this ammo. Here are some 9mm and .40S&W Gold Dot numbers McNett posted on GT back on 2.22-2006;

    A question I'm unable to reconcile is the comparison between the 140gr Barnes bullet and 155gr Gold Dot. How is it that the slower velocity, wider expanding, lighter weight 140gr Barnes bullet achieves deeper penetration than the faster, heavier, less expanding 155gr Gold Dot?

    Bob :cowboy:
     
    Last edited: Jul 18, 2010
  7. gatorboy

    gatorboy

    4,078
    166
    Jul 26, 2001
    It's pretty nice
    A 125 that is backed by the same amount of powder as a 165 is going to affect recoil. It will recoil less. As for the rest of the points I made, you missed them also. You don't know enough to teach me anything so please stop trying.

    The GAP really sucks for the Barnes bullets since theres not enough room for Speer to pack a regular copper jacketed lead 230 in. :whistling:
     
  8. BOGE

    BOGE Millennium Member

    4,622
    0
    Mar 21, 1999
    Because it's a solid copper projectile. There are hundreds of gel tests on the Internet showing how the Barnes solid copper bullets penetrate better.

    I misssed nothing. Reread your rambling first post. Just keep shaking your cartridges like a monkey. :upeyes:
     
    Last edited: Jul 19, 2010
  9. thegriz18

    thegriz18 Paper Killer

    3,065
    0
    Jun 17, 2007
    Friend Zone
    There is only one way to solve this question. Someone has to get those DT 125 and 140 loads and chrono them. I mean about 20 rounds each, and then see how far off DT's numbers are, taking into consideration the elevation that DT tests their ammo at. I personally would like to see how a 125 grain 40 penetrates at 1400 fps. It must get 6 inches. I'm hesitant to use that. Shoot, I'm hesitant to use the 135 grain HST load since I can't find any reliable numbers on it.
     
  10. So, a lighter, slower velocity, wider expanding, machined HP copper bullet will penetrate deeper than a heavier, faster velocity, less expansion diameter copper jacketed bullet??? :yawn:

    Using McNett's data, the much slower 9mm/147gr Gold Dot penetrated slightly (0.25") deeper in gel than the .40S&W/140gr XPB bullet and his .40S&W/155gr GD slightly less (0.75") than the 'wonder' solid copper design.

    Given that differences in gel calibration numbers can yield 2" + penetration depths. Gel calibration numbers are important when making ballistic comparisons, given the high cost of the XPB bullet; other designs perform just as well, if not better, than the Barnes bullet.

    Bob :cowboy:
     
  11. gatorboy

    gatorboy

    4,078
    166
    Jul 26, 2001
    It's pretty nice
    There are major discrepancies (simple physics) with those "hundreds of gel tests on the internet" as Bob has pointed out below. An ammo company as large as DT, Corbon and others should have the tests available to the consumer to view online.

    As for shaking things like a monkey, I save that for a couple other things I have when I read your drivel.

    I'll chrono these loads in the next two weeks and make an attempt to get video. Your instinct not to trust the 135 HST is a good one. The 155 is very soft shooting also and the 180 expands better than any of them and is as tame as any 180.

    Second stage jet propulsion?
     
    Last edited: Jul 19, 2010
  12. Glock1911

    Glock1911 Jackson Wagoner

    592
    1
    Dec 28, 2007
    Inside your head
    From all the stats being bantered around, I'm almost convinced that DT's 9mm and .40 S&W loads are more effective than my 10mm or .45 Super loads.:cool:
     
  13. Scoob

    Scoob

    188
    5
    Sep 10, 2002
    NC

    If you compare only expansion and penitration numbers, it doesn't seem to make sense. I don't think you get something for nothing though.

    My opinion...look at a picture of an expanded XP bullet beside a normal expanded JHP. Think about which would have the least resistance pushing through gelatine. It's like comparing a full parachute vs. one that has a star pattern in its canopy with small sections taken out. If it expands to .6, it is not cutting a .6 hole the way a standard jhp would but rather a star shape that is .6 diameter at its tips.

    Again that is just my opinion.
     
    Last edited: Jul 21, 2010
  14. After testing the 125gr XPB in .38Super (~1200fps), there are better performing bullets. Testing the XPB through sheetrock, 4-layer denim, water bag, large cow rib, water; 3 of the 6 petals folded down.

    [​IMG]

    The life span of a bullet in tissue is only a few milliseconds, just a couple revolutions of the bullet.

    This 124gr Gold Dot (1268fps) illustrates the star effect you wrote about, bullets cutting through tissue like an outboard's prop through water is a misnomer. Hydraulic pressure acting upon the increased bullet's surface area (0.920") drastically slows the bullet;

    [​IMG]

    Expect about 9" of penetration from the Gold Dot and ~10.7" from the XPB (0.649").

    This 230gr Gold Dot 984fps/0.735";

    [​IMG]

    gets about 13.5" of penetration, plus one huge crush cavity.

    Bullet shapes and cavitation;

    [​IMG]

    Bob :cowboy:
     
  15. UnTainted

    UnTainted

    282
    0
    May 8, 2007
    Idaho
    Bob, I'd say in my opinion the 38 round on display in your post performed well. Maybe not perfect, but you did say it defeated a bone, and it stayed together and expanded some.

    I'm not going to rely on expansion for my hole to hit my target, I'll rely upon placement.
     
  16. UnTainted

    UnTainted

    282
    0
    May 8, 2007
    Idaho
    And the 125 grained in 40 may be different than the 38 one
     
  17. Given placement, there is a point where expansion negates penetration to vitals.

    Examples

    This
    [​IMG]

    and this 147gr Gold Dot

    [​IMG]

    both performed very well against large bone, and both penetrate deeper than the 125gr XPB.

    YMMV

    Bob :cowboy:
     
  18. UnTainted

    UnTainted

    282
    0
    May 8, 2007
    Idaho
    Huh? Does that make sense to anybody else?

     
    Last edited: Jul 23, 2010
  19. Snapper2

    Snapper2

    2,413
    5
    Feb 22, 2008
    s.east Texas
    Youre not very likely to have a chance to pick your shot in SD. A shot from a downed position will likely have penetrate further because of the angle. Not only that but whatever else that might be in the way of vitals....forearm etc. Expansion limits penetration.
     
  20. mickdundie

    mickdundie

    1,567
    0
    Apr 9, 2007
    Where can I get 50 rounds for $50.00? Link please

    Never mind ...found it http://www.doubletapammo.com/php/catalog/index.php?cPath=21_26

    That's a good price. Usually runs a buck and a half a round

    Mick:thumbsup:
     
    Last edited: Jul 23, 2010