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Old 08-02-2012, 11:12 PM   #11 (permalink)
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I can say the hammer head and first strikes work really good. I used one on my fs traccer project.(cocker threaded)In test we figured the barrel was a 690 and I used a 688 fin.The fs rnd got almost 3/4 of a turn before exiting the barrel and was very consistant.Shot like a dream out to 90 yrds hiting a cheast size target 6 out of 10 shots it was windy.I have a 688 hammer head coming for my T9.1 now.
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Old 08-03-2012, 08:38 AM   #12 (permalink)
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I think punk works tests showed that the hammerhead ID is .700 if IIFC I highly doubt the so called rifling even made contact. Ive had hammerheads before IMO and the opinion of several much smarter people than I. Its a waste.

PS I think the performance increase your seeing is due.to.the hammerhead being over bored all lowing the fs round to pre spin itself as it flys down the barrel. In other words you could get an overbored lapco 1 piece and save a lot of money and still accomplish
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Last edited by Keebler; 08-03-2012 at 08:42 AM.
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Old 08-03-2012, 11:17 AM   #13 (permalink)
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some reading,first strike guys do allot of research.This is a in depth review of the hammer head on a tiberius very impressive.Starts out as a scope thread but gets into the HH teating with FS
http://forums.tiberiusarms.com/showt...hlight=chicago
flasc vs lapco vs new hammerhead barrel - Tiberius Arms Forums
Hammerhead New Tiberius Barrel!!!!!! - Tiberius Arms Forums
Shot results: New Tiberius Rifled barrel vs Stock barrel
First Strike Trajectory? - Tiberius Arms Forums
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Last edited by casper; 08-03-2012 at 01:00 PM.
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Old 08-04-2012, 09:02 AM   #14 (permalink)
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So I havnt read the when thing yet but so far I don't see anything that constitutes as research least not in the scientific sense. He claims both shot the same. Doesn't say.anything about a.dual chrono or a gun vice so we can basically throw out any data he collected. He does say the HH is more efficient well it.would be considering the rifling isn't engaging.the FS round so thereby putting less drag on the round. I'll be doing some official tests of the lapco FSR barrel on my trracer as soon as I get the barrel in the mail. Dual chrono and gun vice and video everything we should need.
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Old 08-04-2012, 02:57 PM   #15 (permalink)
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I'll sell you my lapco fs barrel (pm me) I couldnt get a rnd to leave the barrel yesterday its so tight.Hard data to me doesnt have to be scientific its user end info that matters.Those guys on the tibrius forum put in allot of time effort and money.Myself when I shoot I record chrony speeds of every shot,distance and conditions.Having shoved fs rnds through the 688 hammer head it gives it 3/4 of a turn in under 10 inches.
Since when did lapco start making ac threaded first strike rifled barrels?Did I miss this??We are all looking forward to these test keep us updated .
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Old 08-04-2012, 03:36 PM   #16 (permalink)
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No you didn't miss it. Officially they don't make AC threaded barrels "officially"
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Old 08-04-2012, 04:47 PM   #17 (permalink)
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They make ac threaded barrels just no rifled ac threaded barrels monday I'll call.Hope they get away from the 683 haha!!
here's some math professor
Applying the math to a .683, 3.11g Tiberius Arms First Strike Round that Punkworks shot in a dual chrono test (I'll update this comment with a link to the data soon).

Testing conditions: 1k ft altitude, 70*f

I calculated the Ballistic Coefficient demonstrated for each shot and the average, corrected for standard environmental conditions (zero altitude, 70F) is:

.0162

I'm going to solve for the form factor here as it will come in handy when making predictions for other virtual First Strike rounds. Numbers rounded for readability. Final Number accurate to four decimal places.

.0162 = (0.0069lbs/.683^2) / i

.0162 = .0.0147 / i

i = .9070

Data and Graphics derived from exploitation (I use Chairgun Pro, software specifically designed for airgun ballistic calculations):

Note: All initial velocities are 300FPS.

Maximum Range: 178 Yards
Angle for Max Range: 32 Degrees
Terminal Energy: 1.388FtLb
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Last edited by casper; 08-04-2012 at 04:50 PM.
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Old 08-04-2012, 05:40 PM   #18 (permalink)
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Test's are tests

I, like you, used to discount the Hammhead's but the 0.688 riffled for the Tiberius is awesome and it was tested and witnessed by others. I'm a believer now - try it, it might change your mind. Hundreds of First Strike rounds on a bench with every thing controlled and the same except the wind (which was negligible in all tests).
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Last edited by Chicago; 08-05-2012 at 12:24 PM. Reason: grammar and added number of rounds
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Old 08-06-2012, 01:00 AM   #19 (permalink)
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Quote:
Originally Posted by Chicago View Post
I, like you, used to discount the Hammhead's but the 0.688 riffled for the Tiberius is awesome and it was tested and witnessed by others. I'm a believer now - try it, it might change your mind. Hundreds of First Strike rounds on a bench with every thing controlled and the same except the wind (which was negligible in all tests).
Yeah man, I'm donncath on the Tiberius forums and your tests are the reason I have a Hammerhead bangstixx on my Trracer now. I have emailed hammerhead with no reply, but I was wondering if anyone knows what the ID of the standard hammerhead barrels are? I have a .688 back but I don't know if the inner rifling performs the same function as the Tiberius hammerhead first strike barrels.
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Old 08-06-2012, 09:09 AM   #20 (permalink)
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Punk works reports the ID of the rifled portion is .700
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