Some notifications are in order; It is potentially dangerous to fire a conventional projectile through this barrel's rifling geometry, as the high rpm creates a distinct possibility of copper-jacketed projectile disintegration in the muzzle brake. To partially guard against hazardous experimentation, the bore diameter of the ZA 338 is exactly 0.338" (rather than .330"). This will impart little, or no, spin to a conventional bullet.
I was really not planning for the lube to become a primary focus this early.
I have a minute, so some it might be time to provide additional detail on use of ZA bore-lube. This grease-consistency compound "fires" onto metal surfaces at propellant combustion temperatures. After an initial primer film is laid down with a patch, all subsequent deposits are applied through actual shooting... and the process is self-cleaning, at least for engraving-band projectiles. I have no reason to believe the same would not be true of jacketed bullets. One of the ingredients is present only for the purpose of scavenging carbon, and copper.
Frank will probably demonstrate application following SHOT. I was really not planning for the lube to become a primary focus this early.
" 'I was really not planning for the lube to become a primary focus this early.
But Noel, you wrote the magic phrase
'extended barrel life...'
Forum-wars are won and lost over this argument alone!"...
What the grease giveth, it taketh away. I expect the gains realized at lower pressures (40-50 kpsi) will break-even at the operating ranges enabled with HP steel cases.
"Reading this, I see potential for the chamberings I shoot that are borderline near-overbore, like the .260, .280, and .30-'06; but I'm not so clear about whether this substance would be contraindicated for gas guns."...
At the gas port, concentrations of lube would be relatively small. To the extent it entered the actuating cylinder, lubricating properties should still exist, and there would certainly be less build-up than that deposited by propellant residue.
Sorry, I missed you.
"So... with a 30" finish length, is 3000 FPS reasonable for a .338LM?"...
"Can we get a price per projectile?"...
Frank is waiting for a new barrel to shoot the current 338 ZA projectile. We have been struggling with Emerson to get their software communicating properly with their CNC controllers for over four months now. The drill, and oversize 338 reamer are waiting patiently on the shelf.
That portion of development has taken so long that a secondary project, ZA standard rifling projectiles, will beat the hyper-velocity system to market. There will be an announcement here on the Hide within the next few weeks.