TV still hasn't given up, partnering with FN for 6.8 TV conversion for M240.

https://www.thefirearmblog.com/blog/2023/06/02/true-velocity-partners-fn-america-develop-m240-conversion-kit/

Possibly for Australia or some other contract?

gatnerd said:

Possibly for Australia or some other contract?

Possibly, but I think it's more likely that TV is just hoping to cash in on the M240 conversion they developed a couple years ago and get a contract somewhere, sometime.

Given Australia's increasing alliance with the US ( see 3:33-4:10 in https://youtu.be/gGLvUyzEMj0?t=213 ), I expect they would want to use the same type of 6.8x51 ammo.

Today I checked a few things on the LT since I had recently chopped the barrel to 14" and recrowned it then pinned a Surefire Warcomp on to make the barrel 16.1"

I started with the barrel clamp crossbolts torqued to 50in lbs, manual says they should be torqued to 60. The groups were bad, near 5" with m193 and 3 or a little better with handloaded 62gr gold dots. I retorqued the bolts to 55 then 60 then 65, shooting a few groups at each torque, at 65 in lbs it all came together. The 62gr gold dot load hit 1.25" with 3 consecutive groups. Not a precision rifle but good enough for a fighting rifle.

Great info Harrison, glad to hear it’s shooting well. 
 

interesting that SIG specs 60 but 65 works better.

i had 2 questonis about steel cores....

am i right in thinking that the only steel portion of current 556 is the tip? apparently it only weighs 19 grains. why didnt they go with a long rod instead>

also, could you get a really long .17 bullet to be made entirely out of steel (if it was saboted), and could you use a really dense steel to bring the weight up to , say, 40 grains?

or is all steel fairly light.

oh, lastly, how would a flechette round do against lvl 4 armour?

take the soviet 3mm flechette.  37 grains, 55mm long, and a energy of 900ft lbs.

smg762 said:

am i right in thinking that the only steel portion of current 556 is the tip? apparently it only weighs 19 grains. why didnt they go with a long rod instead>

Yes, on the M855A1 EPR there is a small hardened steel "arrow" at the tip of the bullet.

They evaluated this design against a PPI bullet made with a longer steel core and a brass sabot, but this bullet design was longer than the EPR and the bullet intrusion into the case was considered too high. The usable powder volume was reduced and the pressure needed to be increased too much to achieve the required MV.

smg762 said:

also, could you get a really long .17 bullet to be made entirely out of steel (if it was saboted), and could you use a really dense steel to bring the weight up to , say, 40 grains?

A really long (spin stabilized) bullet will probably not work with a sabot, so you will need to make an APFSDS. It was trialed during the ACR program and didn't worked well...

SIG sharing updated specs of their 6.8 LMG. Surprised weight isn't listed

https://pbs.twimg.com/media/F3sDoxbawAEXaAZ?format=jpg&name=large

Perhaps more interesting is SIG is advertising its .338 MG as capable of firing a .338 Hybrid; curious what a 80kpsi .338 is capable of ballistically:

https://pbs.twimg.com/media/F3r8B8kawAg9OZA?format=jpg&name=large

gatnerd said:

Surprised weight isn't listed

Perhaps weight will vary depending upon caliber and which buttstock is used, as well as whether or not the XM257 rail (shown below) is fitted?

Here is an older SIG XM250 data sheet (for the 6.8x51mm version) that does list weapon weight:

stancrist said:

Here is an older SIG XM250 data sheet (for the 6.8x51mm version) that does list weapon weight:

I don't know if it's an official document by SIG-Sauer (the German flag looks highly suspicious), as this flyer bears the tag "by Ricardo Torres", and the 4395 J of muzzle energy listed don't fit well with a 135 gr bullet launched at 950 m/s (but 4395 J is OK with a 150 gr bullet launched at 951 m/s, which is exactly what SIG is claiming for the Elite Bonded bullet from a 24" barrel).

YouTube

Future Warfare Rifle Setup? | Noveske 6 ARC Thermal

Many would see this as a "future" rifle setup. Truth is, it is a "now" rifle setup, as enemies both foreign and domestic have individual capabilities much gr...

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