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Underwood 115gr XTP +P

3K views 36 replies 7 participants last post by  Operator_AF 
#1 ·
Has anyone found any information or tested this load? I can't find much on it.
 
#4 ·
If you get some and want to send me 5 rounds I will gladly test it for you out of any guns listed in my Signature.
 
#6 ·
Where in Central NY are you?
I am in Albany
 
#8 ·
Ok that's about 3 hours....I was thinking if you were closer you and I could have just tested it
 
#9 ·
Yea, it's a bit of a drive. I have a feeling if that Underwood load actually clocks around 1300fps it could be quite effective. The XTP should expand nicely, but not give up too much penetration like the Gold Dot or Nosler JHP does.

If I had to guess I'd say .55 expansion and 12-13in penetration, but who knows.
 
#11 ·
Yea, it's a bit of a drive. I have a feeling if that Underwood load actually clocks around 1300fps it could be quite effective. The XTP should expand nicely, but not give up too much penetration like the Gold Dot or Nosler JHP does.

If I had to guess I'd say .55 expansion and 12-13in penetration, but who knows.
Got a feeling it will be a lot more than 13".
 
#12 ·
I have an unused 6x6x20 and a 6x6x16. I have a HEAVILY used 6x6x16 and a HEAVILY used 6x6x20. The downside is if we did a lot we would have to go to the range which is about 35 minutes from the house. When I am doing a small amount like 5-15 rounds I just do that in the back of the house. I have done a bunch of testing already What rounds are you thinking of?
 
#13 ·
Out of all the testing the federal HST 124gr standard pressure has been stellar. 18" of penetration with average expansion of .620
 
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#19 ·
The old Hornaday catalog used to list the velocity envelope of all their bullets, I couldn't find it in their newest one.

IME, the XTP expands to a maximum of about 1.5x original diameter, so penetration is usually better than the flying ashtray style bullets that expand to more like 2x. Even when over driven the larger expanders still need to go through their fully deployed stage before folding back and cutting cross sectional area, so less penetration than a similarly loaded XTP is almost always the result.
 
#15 ·
i carry a Doubletap round. 124 controlled expansion JHP, rated at 1295 FPS out of a G19.
approaches .357 potential. they do shoot well! bought enough to test.
feed and function perfect, snappy, but not unreasonable.
shot to point of aim.
no sign of excess pressure.
when i carry the 19 instead of the G29, it is with confidence.
should be no issue penetrating bulky winter clothes and doing the intended job.
Underwood, Buffalo Bore and Doubletap all make a good product.
 
#17 ·
i carry a Doubletap round. 124 controlled expansion JHP, rated at 1295 FPS out of a G19.
approaches .357 potential. they do shoot well! bought enough to test.
feed and function perfect, snappy, but not unreasonable.
shot to point of aim.
no sign of excess pressure.
when i carry the 19 instead of the G29, it is with confidence.
should be no issue penetrating bulky winter clothes and doing the intended job.
Underwood, Buffalo Bore and Doubletap all make a good product.
Are they clocking close to 1295? Last I heard McNett was having difficulties getting his ammo to meet his spec. Have they fixed that issue? I haven't been following double tap ammo.
 
#16 ·
I have an unused 6x6x20 and a 6x6x16. I have a HEAVILY used 6x6x16 and a HEAVILY used 6x6x20. The downside is if we did a lot we would have to go to the range which is about 35 minutes from the house. When I am doing a small amount like 5-15 rounds I just do that in the back of the house. I have done a bunch of testing already What rounds are you thinking of?
Federal 124 HST+P
Winchester RA556B 64gr Nosler Bonded Solid Base
Winchester SXZ 115gr JHP (Why not, probably the exact same as Win USA JHP with a lubalox coating, but why not?)
 
#20 ·
Glock 43
Weather 42*, Humidity 86%, Pressure 29.8inHg
Winter wear with one layer of medium weight nylon outer polyester fill, one layer of polartec 200gr and one layer of T-shirt Hanes cotton.
Federal HST 124gr standard penetrated to 15", expansion .628", second round 18 1/2" penetration and .614 expansion
Federal HST 147gr standard pressure penetrated to 16" expanded .614", second round penetrated to 18 1/2" and expanded .595"
Underwood Xtreme defense 90gr+P penetrated to 17 1/2" no expansion
These Xtreme defense rounds in .45 and 9mm are extremely consistent as all of them penetrate to 17-17 1/2"
So I took out my 380 Underwood 90gr Xtreme Penetrator and out of my LCP II it penetrated 17 1/2"!
Corbon DPX 115 +P penetrated 16" with beautiful expansion of .685". Both .45 DPX 185+P and 115+P were very consistent in all media's
Critical defense penetrated to 11 1/2" and expanded to .485"
I will continue to carry the HST standard pressure as it has been the only HST in 9mm to continuously expand and penetrate. It does seem that you will be well protected in virtually any of these rounds.

Also
I also tested 9mm out of a Glock 43 with 4 layers of Denim
HST 124gr standard pressure was the clear and decisive winner by a land slide
5 out of 5 penetrated to 18 1/2" and all expanded beautifully
HST 124+P penetrated to 15" and expanded to .628"
Hst 147 and 147+P also clogged with denim and some expanded and some passed through 20" block
Speer gold dots 124+P did not perform well. Only 1 expanded and penetrated to 14". the 4 others did not expand and passed through 20"
I did two .357 sig out of a G33
Corbon 125gr DPX pentrated 14 1/2" and expanded nicely
Underwood 125gr gold dot ROCKED the block. It hit so hard the block lifted up.
Penetrated 16" and expanded beautifully to .60"
 
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#21 ·
I've stuck with the 124+P HST since I switched back to 9mm in May. Carried the 147+P for a short stint and the changed out for 124. I know the 147 load does really well, there is just a part of me that feels the 9mm was designed for and should be supersonic or close to it. If I want heavy for caliber and around 1000fps I'll just move up 33 grains to a .40 180gr old.
 
#22 ·
It's pretty standard that the greater the velocity the less penetration with greater expansion. Doesn't always work that way. I much prefer 16-18" penetration. I just tested Winchester 147 gr Defend as ammoquest got excellent results. I did not. Mine penetrated to 19 1/2"-20" with 4 layers of heavy denim and with two 5.3oz cotton it penetrated to 19". All rounds expanded to about .55"
 
#23 ·
What pistol are you carrying the 124+P in?
 
#24 ·
HK P2000

I'm fine with 10-14in penetration in gel. I've seen some real life examples of actual performance not equaling science tests and it's typically always on the end of more penetration than expected.

Ex1: .40 180gr Ranger T. Impact in upper chest, complete penetration of suspect and about 3 (IIRC) interior walls.

Ex2: 9mm FMJ entry into lower chest, no exit, range maybe 3 yards. Go figure.

However, I don't believe in overpenetration at all so I'm also fine with a 22in penetrating bullet and 1.5x expansion.
 
#32 ·
..However, I don't believe in overpenetration at all so I'm also fine with a 22in penetrating bullet and 1.5x expansion.
I believe in over penetration, but maybe a little different than all the guys who fixate on 13"'s in gel might think.

The over penetration I worry about in bullet performance is the one where you miss the intended target.

I knew a retired CA Highway Patrolman who carried a mil-spec 1911 AWIB. It was loaded with his own 200gr LSWC's that had a muzzle velocity of about 800fps. He could draw and shoot splits of which a USPSA GM would be proud. He wasn't too concerned with penetration, he was throwing 1400grs of .452 diameter lead dead center at his adversary faster than most BG's were going to get their gun clear of their holster and pointed roughly at my friend. He never spoke of bullets, penetration, all that stuff. All he cared about was accuracy and speed.
 
#25 ·
P2000 barrel length is 3.66"
I think my Sig 228 is as close at 3.9"
G43 is 3.39
 
#27 ·
Nope that was my mistake when I was younger. I had a beautiful West German 228 unfired before I knew any better. I traded it off years ago and this one is a newer one....UGH UGH UGH
 
#30 ·
I just noticed this post about Underwood Ammo; I must start looking into it. In 1995 I went with the Cor Bon +P 115gr JHP as a round for the 9MM. My choice for a 147gr in the 9MM is still the Winchester Black Talon. Although I seldom carry my Glock 26 I always up for good ammo tip.
 
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