This is intended for people interested in the subject of military guns and their ammunition, with emphasis on automatic weapons.
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Here are some relevant extracts from the study Emeric linked earlier, about the specifics of the effects of chamber misalignment, along with a nice picture of the kind of yaw at 0.54 milimetres for a visual aid
Wonderful, thank you, much easier to read.
Sounds like going to a more appropriate projectile design could help A LOT...
Hmm who do we know who has projectiles designed for something like this?
Would have thought that 0.254mm misalignment is huge to even think of having between the bore and the chamber , till you consider the moving chamber design Textron is using. They are screwed .....
Does this mean that you've heard on the grapevine that the Textron is having issues currently, or am I misinterpreting what you're saying?
No, I have no "first hand" information on the Textron offering.
The "anonymous USAMU" claim about the potential lack of accuracy from GD and Textron just reminds me of an old paper I read regarding CT ammo and out-of-center chamber, so I put the link here.
Ah, Tungsten EPR I assume?
That was my initial understanding, but I was wrong.
The "smoke screen" on this program is denser than anticipated!
That was something I had wondered about awhile back - if they just took the EPR design, and swapped out the steel tip for tungsten, then the projectile would be very front heavy (as opposed to the preferred rearward weight balance.) Also the projectile would be pretty radically different in overall weight.
Same feeling here when the XM1158 ADVAP was presented.
Replacing the steel arrow of an EPR bullet with a tungsten arrow is going to push the CoG of the bullet in an area unsupported by the shank, inducing a lot of in-bore yaw. So you need also to replace the copper core with a denser alloy to achieve proper bullet balance.
SIG NGSW Update high rez pics:
Thanks for the clarification Emeric, It can be kind of hard to convey nuance/specific meaning over text on a forum, especially between two unfamiliar speakers.
For the sake of this whole program, and the future of small arms in general, I really, really hope that they've found a way to maintain sub 0.1mm tolerances during full auto fire, it's already got acceptable accuracy in the LSAT so by extension it should be fine in the NGSW-AR, It's the NGSW-R Carbine I'm worried about, I (And everyone here probably) would also like to see a G&A Issue on their entry, seeing as they're the only one to not have one yet, but that's up to Textron obviously