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Old 11-30-2012, 00:57   #1
Smokin45
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75 gr. through 1:9 twist??

Just picked up some TAP 75 gr. and was wondering how it would shoot through a 1:9 twist barrel? I will be using it with a Armalite AR with a 16" heavy barrel if that makes a difference..
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Old 11-30-2012, 01:02   #2
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The only way to know for sure is to shoot it and find out. Some barrels will shoot it just fine and others wont.
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Old 11-30-2012, 01:13   #3
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My 1-8 loves 77gr Sierra Matchkings. Only way to know is to shoot it.

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Old 11-30-2012, 06:29   #4
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.....Only way to know is to shoot it.

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Old 11-30-2012, 07:30   #5
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I'm only shot 75gr TAP through 1:9 at 25 yards. Works ok but that distance really doesn't prove anything.

I've since decided to standardize on 1:7 twist so I can shoot 77gr Mk 262 and such.

Last edited by cowboy1964; 11-30-2012 at 07:30..
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Old 11-30-2012, 07:57   #6
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My 1:7 ARs love it, my best friend's 1:9 loves it, and my 700P 1:10 loves it. My 75gr Hornady OTM handloads are good out of all of our guns out to 200yds. I haven't shot them further than that on paper. I have killed a couple hogs at further distances than that so I assume they are still stable enough.

My 700p shoots cloverleaf groups at 100 and 1-1.25" at 200 with this load and according to the interwebz it's impossible due to the 1:10 twist.

I have yet to find a gun that wouldn't shoot it, but go shoot some out of yours to be sure. That's the only way to know for sure.
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Old 11-30-2012, 08:20   #7
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More than being a rifle to rifle thing, its an environment to environment thing. Gyroscopic stability requires more rpm's in environments with more friction from the bullet passing through the air as well as higher rpm's when the center of pressure is farther forward. In less dense air, friction is less. Temperature, humidity, and low barometric pressure lessen the density of the air and allow bullets to stabilize at lower rpms.
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Old 11-30-2012, 08:58   #8
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More than being a rifle to rifle thing, its an environment to environment thing. Gyroscopic stability requires more rpm's in environments with more friction from the bullet passing through the air as well as higher rpm's when the center of pressure is farther forward. In less dense air, friction is less. Temperature, humidity, and low barometric pressure lessen the density of the air and allow bullets to stabilize at lower rpms.
So good at 7,000 feet. Not so good at 2000?
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Old 11-30-2012, 09:12   #9
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So good at 7,000 feet. Not so good at 2000?
That's the idea but I can tell you that mine work at 3,256 ft. (Lubbock, TX), 2,605 ft. (Post, TX) and 3605 ft. (Amarillo, TX).
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Old 11-30-2012, 09:17   #10
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The 75gr Horn match bullets shoot fair out of my 1:9" and Sav 1:9" good enough to use for close work. But the 75gr Amax shoots real good in my PSA 1:7" and yes you can load them to fit the Mag.
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Old 11-30-2012, 18:36   #11
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Both my Savage 12FV and Bushmaster rifles shoot the 75gr bullets just fine. Both are 1:9 barrels.
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Old 11-30-2012, 19:04   #12
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My Bushmaster AR has a 20 1/9 barrel. It shoots Hornady 75gr Superformance at 100 yards very nicely with iron sights. I tried it with the scope and kept tight groups.

As said, you just need to try it out.
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Old 11-30-2012, 19:24   #13
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As others have said, try it and see.

Longer barrels are more likely to see good results than shorter, however. Since you asked about TAP, you might want to check out some of the lighter 62-64 grain bonded soft points, Gold Dot JHP, or the various loads out there using Barnes TSX bullets.
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Old 11-30-2012, 22:21   #14
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Just picked up some TAP 75 gr. and was wondering how it would shoot through a 1:9 twist barrel? I will be using it with a Armalite AR with a 16" heavy barrel if that makes a difference..
I have wondered about this, as well. The packaging even states "1-9" twist or faster," so 1-9" should be good to go. However, there is the occasional report from shooters that their 1-9" barrel didn't stabilize this round. It does seem to be a very, very small minority, though. I bet 19 in 20 barrels with a 1-9" twist will stabilize this round just fine. But, like others have said, no way to be sure until you shoot it at about 200 yards and check for keyholes, etc...

I wonder what Hornady would say if someone with a 1-9" twist barrel contacted them to say their barrel couldn't stabilize this round? Since it's even on their package, couldn't that be false advertising or misleading? I bet they would send out some replacement rounds, maybe 60gr Tap or something similar if you made a big enough stink.

Last edited by WinterWizard; 11-30-2012 at 22:24..
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Old 12-01-2012, 08:46   #15
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I know a dude who just got a DPMS with a 1-9 twist. He said that the 100yd groups opened up to about 6-7 inches with 75gr. bullets. He was holding 1-2 inch groups with 55gr. ammo.
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Old 12-01-2012, 14:01   #16
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I wonder what Hornady would say if someone with a 1-9" twist barrel contacted them to say their barrel couldn't stabilize this round? Since it's even on their package, couldn't that be false advertising or misleading? I bet they would send out some replacement rounds, maybe 60gr Tap or something similar if you made a big enough stink.
Possibly. OTOH, they make no claims about accuracy at distance, so...
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Old 12-01-2012, 16:48   #17
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Possibly. OTOH, they make no claims about accuracy at distance, so...
Yeah, but if it's keyholing, it's obviously not stabilized, and there is physical proof by way of the paper target. If they say a 1-9" twist will stabilize this bullet and the bullet is tumbling sideways through the air from a 1-9" barrel, I believe that's a problem. Of course, there are small discrepancies from barrel to barrel. Your 1-9" may actually be a 1-8.8" or a 1-9.2", etc. That is where the problem lies likely.
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Old 12-01-2012, 17:45   #18
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Typically, a 1:9 barrel is good for 55gr. to 72gr. ammo. When you get into the 75gr. and higher, 1:8 or 1:7 is the best route to take. They can stabilize the heavier round better. This is not a hard fast rule, but more of a guideline. Sometimes, it can depend on the load of the heavy round as to what kind of performance you will get in a 1:9 barrel. Personally, I have a dedicated 1:8 (18") AR (Mk12 Mod0) for shooting heavy ammo (in my case, 77gr.). Everything else is for the .55gr. - 63gr. ammo. My advice, if you want to shoot a heavy round, build an AR that is more suited for it.
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Old 12-01-2012, 19:47   #19
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Good reason to buy a proper 1:7 barrel if you ask me
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Old 12-01-2012, 22:28   #20
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Good reason to buy a proper 1:7 barrel if you ask me
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