"Cream of Wheat soaked in nitroglycerin" tooo damn funny...
Posted on 05/26/2018 9:06:40 AM PDT by MtnClimber
2,000 meters rules out 5.56 and 7.62.
.408 Cheytac or .416 Barret maybe.
L
Seems everybody is jumping on the 6.5 train, like it’s a new wonder round. I was shooting 6.5-284’s and 6.5-270’s back in the 70’s. Hell the 257 Weatherby is almost a 6.5, and lets not forget the old 264 Win Mag.
“Why the reinvention of cartridges? Anymore, it seems rifle buffs neck down and blow out the shoulder of some existing cartridge, then say they can load it with anything from H4831 to Cream of Wheat soaked in nitroglycerin and have magic bullets emerge from the barrel.“
The only relevant 6.5 mm short action round besides the Creedmoor is the 260 Rem, which was also evaluated. The Creedmore has a 30 degree shoulder, which has emerged as the best for accuracy, and the Army ended up preferring it. The Creedmoor is also set up better for long bullets.
The 6.5 Creedmoor has also become extremely popular with civilians, both for target shooting and hunting.
Thanks. Appreciate the explanation. Seems like it’s all about overall cartridge length these days.
Heat mitigation- aggressive fluting multiplies surface area while providing additional stiffness to the barrel.
Light weight- aggressive fluting removes mass while increasing surface area
2000m effective ranges? Hmmm, not the 762x51, they mention 6.5 Creedmore- but while that is a step up in terms of better external ballistics, it is a step down in terms of total KE/Momentum at the target, even with very heavy fro caliber ( 160-180 grain bullets- the trade off is big for increased mass of projectile to overall performance on target. Better than the 762in the end though.
durability- carbon steel salt bath nitrided in and out provides a much tougher barrel regarding erosion from powder gases, could triple barrel life; also new ceramic-metallic coating ( Cermet) may be able to provide both less friction and more barrel life as well as less heat build up ( less friction).
Operating system/recoil management- gas operated systems steal some energy to operate the mechanism, well and good but that energy is used at the expense of the downrange effect. The operating mass eats up some recoil. Perhaps a recoil operated system with a floating receiver/barrel/bolt inside a shell body/buttstock would attenuate recoil better-and does not use propellant energy to operate. Heat has to go somewhere too. Out the muzzle behind a bullet is better than back as heat (energy) into the mechanism...
Downside to recoil operated mechanism is non-adjustable operating mechanism.
the trend to short barrels is the long pole on the tent, so perhaps a bullpup configuration with a 26 “ barrel ( where the 6.5 really shines) may be needed, keeping the OAl within comfortable handling realm.
Think of a 1919 or M2 type mechanism ( recoil operated) inside a shell so the whole of it floats on a recoil attenuation system- recoil is used to operate and is delayed to the firer as the mechanism in operation moves rearward in the shell.
Where are John M. and Eugene S. when you need them?
There are a myriad of wildcat short action 6.5 round- 6.5 LR, 260 AI etc, they all use a steep shoulder/short neck and are great mid caliber long range rounds. The 260 and 6.5 creedmore are ballistically very similar, as are the rest the of the field of 6.5s.
They also tend to give good barrel lie unlike the long action 6.5s- the 6.5/06 etc tend to last at full power, maybe 1200 rounds from a quality cu rifled Krieger or Obermeyer, much less from button rifled tubes.
"Cream of Wheat soaked in nitroglycerin" tooo damn funny...
I haven't kept up with ceramics but just took a quick look around and it does appear that technology has advanced to the point that some form of ceramic/cermet or other advanced material will go into the barrel of this new weapon.
About 10 years ago I was given an old box of Remington Accelerator 30-06 plastic sabots by a friend of the family who had purchased them years earlier but never tried any out. All 20 rounds looked shiny and new.
I was disappointed with the accuracy and concluded that there was too much accuracy impeding variability associated with plastic sabots which is why they have never really caught on as a center fire rifle cartridge.
Almost all long range rifle shooters use 6mm or 6.5mm rounds. The heavy for caliber rounds have better ballistic coefficient.
Way cool!
Ah yes. The machine gun made of unobtainium. Everything we ever wanted in a mg, even the “long life” barrel.
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