Re: 5000 meters+ Supersonic
Saojao,
The title of this thread implies some actual ELR testing. Can you at least confirm that you have clocked these things flying in excess of Mach I at 5,000 yards?
As you might recall from our conversations, I was less concerned with a BC compromised by faulty design than general stability issues (in a bullet presented as publicly available for sale a number of pages ago). A minimum of one other participant has pointed out that the projectile is at the core of your system, and at approximately 6.7 calibers in length, this beast appears to have inherited the same flaws as the GS338/6.7 295 grainer that has now been suspended from the GS line-up.
While you have redesigned the case, you have also replaced the US Optics SN-9 scope, a wrapped barrel from ABS, and a Savage clone receiver from Louis Corkern. Your new barrel is coming directly from Obermeyer's shop, a new Savage-based receiver from Lancaster PA, and a new piece of glass from Valdata. The only component that has not been substituted is the commercially released GS projectile... which is where the entire story begins, and ends.
Might I make a suggestion?
Since it is your expectation to release your rifle for public consumption under the newly issued ATF exemption, why not include the 14.5 mm GS projectile in this Fall's range testing of commercially available 338 projectiles? While the original intent is to limit caliber, I am certain the organizer would make an exception for you. I do not expect this bullet to make the claimed range from any case, out of any twist-rate... even if Boots sent you one appropriate to caliber length.
While larger caliber bullets do provide a greater margine of design error, you really do not want to depend upon that, do you? We can easily go out to 5,000 yards, and give you accurate retained velocity data.