The Accurate Reloading Forums THE ACCURATE RELOADING.COM FORUMS Rifles Big Bores twist AFTER total expansionGo | New | Find | Notify | Tools | Reply | |
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yes, these are .308s, and barnes... http://www.barnesbullets.com/x-citingfacts.php  clearly shows twist after max temporary channel apparently it doesn't take "much" to open up a .308 TSX... this is a FACTORY load 308 win  2 INCHES lastly, hmmm, this one will cause a stir... as the bullet slows, the rotation doesn't slow proportionally... that is, the bullet keeps twisting as the velocity slows... as evidenced by, initially, the waves (frequency) being farther apart, but as the bullet slows, they grow closer together... clearly showing the velocity slowed MORE than the rotation.  opinions vary band of bubbas and STC hunting Club Information on Ammoguide about the416AR, 458AR, 470AR, 500AR What is an AR round? Case Drawings 416-458-470AR and 500AR. 476AR, http://www.weaponsmith.com | ||
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Is that sweet, or what? Rich NRA Life Member DRSS | |||
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Actually, that doesn't surprise me. One has to remember that it technically is not the bullet itself that does the damage in that wound channel, but the shockwave that is pushed ahead of the bullet. This should make sense once you look again at the max diameter of that mushroomed bullet, and then look again at the diameter of the wound channel. In essense, the bullet is close to spinning in the air still, as the shockwave ahead of it is clearing the path for the bullet. As the shockwave is asked to do work (damage tissue, gelatin, etc.), the energy is reduced dramatically, hence the large initial wound, and the shockwave quickly dissipates, leaving the bullet to fend for itself. | |||
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Alf, You confused the messenger. Address your comments to Jeffeosso, please, whom I thank for bringing the message. This seems to show that maybe twist is important within the temporary cavity. Hell that may be a near vacuum.  Yes old tests found bullets shot into the air straight up on calm days would sometimes return to earth base first and spinning nearly as fast as when they left the barrel.  | |||
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From Barnes: "The more rotations the bullet makes, the greater the odds of lacerating one or more vital organs." Sounds like an endorsement for fast twist. | |||
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The photos need to be shot with the bullet still in the gelatin. I think you would see the waves spread laterally from the bullet and are not pushed ahead significantly. | |||
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ireload.. shot barnes an email and ask if they have those pics jeffe opinions vary band of bubbas and STC hunting Club Information on Ammoguide about the416AR, 458AR, 470AR, 500AR What is an AR round? Case Drawings 416-458-470AR and 500AR. 476AR, http://www.weaponsmith.com | |||
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those bernes will come iN handy in the thick stuff when its easy to get chargerd by a dangerous cube of gelatin id hate to be trampled and clawed by one of those...  but seriously el jeffe that is some interesting stuff and damn good photography. 577 BME 3"500 KILL ALL 358 GREMLIN 404-375 *we band of 45-70ers* (Founder) Single Shot Shooters Society S.S.S.S. (Founder) | |||
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they're good on charging water jugs and steel plates too! NRA Life Member, Band of Bubbas Charter Member, PGCA, DRSS. Shoot & hunt with vintage classics. | |||
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So based on this the TSX's should never have any "expansion" issues. | |||
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from what i gather they can be deformed by recoil in the mag and some dont open up but i think the big bores have stronger tips. so check to see if the tips are getting deformed in your rifle. 577 BME 3"500 KILL ALL 358 GREMLIN 404-375 *we band of 45-70ers* (Founder) Single Shot Shooters Society S.S.S.S. (Founder) | |||
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Good find on the pictures Jeff. Cool to see the actual rotations per inch of travel in a test medium. Best of the season to you, Dave | |||
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Not to pick nits but shockwaves are capable of producing enormous damage in lung tissue. The passage through air pockets in the lungs causes ruptures of the soft tissues that don't occur in solid tissue. Just like the shockwave from a detonation in water shreds a diver's lungs and sinus cavities, so does a hyper-velocity bullet strike to a proportional degree. "Experience" is the only class you take where the exam comes before the lesson. | |||
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Shot a gelatin block with 350 gr soft jacketed bullet at 3400 plus, and the block disintegrated.It was with my 458HE, few years ago. 1 to 22 twist.Ed MZEE WA SIKU | |||
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good for barnes,they have a good bullet | |||
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First of all appologies for mentioning a dinky caliber, and twist... Great pictures, thanks Jeffe A while back I was contemplating a fast for caliber re-barrel and the vast mind of the forum concluded that using a 1 in 8 say for a .30 cal was a waste of time. I did specifically mention that the idea was for shooting living tissue (game animals) not paper targets. My assumption was that using quality bullets I would not likely be giving up practical field accuracy, and just maybe be gaining a smigeon of killing power. After all a achange from 1 in 12 to 1 in 8 is a 50% increase in rotational velocity if muzzle velocity is the same.  Member NRA, SCI- Life #358 28+ years now! DRSS, double owner-shooter since 1983, O/U .30-06 Browning Continental set. | |||
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I bow to your knowledge about rifle projectiles but I have had more than one tragic instance of having divers die from shock waves from explosive detonations (hydrogen generated from underwater oxy/arc cutting that detonates if allowed to pocket behind the structure being cut). I suppose I was wrong to assume that a rifle projectile can generate enough shock to do the same. "Experience" is the only class you take where the exam comes before the lesson. | |||
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The Accurate Reloading Forums THE ACCURATE RELOADING.COM FORUMS Rifles Big Bores twist AFTER total expansion
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