rifleman762
CGN Ultra frequent flyer
- Location
- Southern Alberta
Supersonic objects act differently than slow speed objects. The boundary layer of air at Mach 2.5 is probably not going to do much of anything on the ogive of a bullet.
Miracle invention, or total gimmick?
- Thread starter tootall
- Start date
Supersonic objects act differently than slow speed objects. The boundary layer of air at Mach 2.5 is probably not going to do much of anything on the ogive of a bullet.
With regard to dimples, as on a golf ball, there's this report http://bulletin.accurateshooter.com/2009/04/us-army-team-tests-radical-new-dimpled-bullet/
Herters would have sold the hell out of these bullets. In the description, they would be said to turn the rules of ballistics upside down as the spiral flutes actually pulled the bullet through the air. It would have been called the Spira-Thrust and recommended for use in the Herters Ram Magnums.
The only thing I have personally seen that is different in bullet design - not just another slight shape change, or weight change was the tubular bullets produced by PMC forty years ago. They were lighter, faster, shot further with more accuracy, and penetrated an ungodly amount of pretty much anything that got in the way. They ran into 2 issues
1) they were banned for being armour piercing handgun rounds - this was definitely true. I fired a 38 +P through a Level 3A vest at 20 yards from a 1 7/8 in snubby with an RCMP buddy at Stokes Pit. He wasn't a fan.
2) the owner of the patent (who had developed the concept for 40mm grenades in Viet Nam) sued them for breach of patent rights.
These things were a true departure, an entirely different projectile, nothing like this fellow's "invention" and they worked, but - they would not feed in a semi, and subsequent attempts to make them work in 9mm SMGs ended up producing MP5's that were unreliable. By comparison this appears to be a Chevy Spark with chrome wheels being touted as a sports car.
1) they were banned for being armour piercing handgun rounds - this was definitely true. I fired a 38 +P through a Level 3A vest at 20 yards from a 1 7/8 in snubby with an RCMP buddy at Stokes Pit. He wasn't a fan.
2) the owner of the patent (who had developed the concept for 40mm grenades in Viet Nam) sued them for breach of patent rights.
These things were a true departure, an entirely different projectile, nothing like this fellow's "invention" and they worked, but - they would not feed in a semi, and subsequent attempts to make them work in 9mm SMGs ended up producing MP5's that were unreliable. By comparison this appears to be a Chevy Spark with chrome wheels being touted as a sports car.
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That's just too funny, made my day! LOL
Anybody who has ever glanced at an old Herters catalog can attest to that, for sure
Cat
I'm old enough to have laughed at that, thx. - dan
ATRS Shaun
Business Member Rep.
- Location
- Calgary, AB
Ironically.... with velocity dropping quickly, but RPM staying nearly constant over a bullets flight... (300,000 RPM) perhaps it IS trading off some rotational force and using the grooves to act like an impeller... it's literally screwing itself through the air! Fun concept to think about, but I'm pretty sure the only thing getting screwed are people taking that class.
I'll make sure to watch KO2M for Weatherby rifles next year.
Haha niiiice
Since someone resurrected this thread, I actually saw it and laughed a bit.
This idea is actually pretty old. IIRC, at the end of the 19th century, there were some designs that used a rifled bullet that literally slotted to (very wide) rifling in the barrel. This was on single-shot (black powder) designs that proved inconsistent of any notable accuracy gains in terms of pressure sealing and very cumbersome to operate (because you basically have to key the round into the chamber).
In a modern magazine repeater, I can't see how 'twist-match' can possibly have any substantial gains given that it is impossible to seat the projectile consistently even if the rifling twist rate is the same.
