new army small arms project that won't go anywhere....

[mongoosesnipe]

seems need but kinda heavy and certainly offers nothing over the grendel based on limited info given

http://www.thefirearmblog.com/blog/2016/05/08/lsat-6-5mm-plastic-cased-ammo-armys-next-small-arms-program/

[stanc]

seems need but kinda heavy and certainly offers nothing over the grendel based on limited info given

I wonder how their performance does compare.

If a 125gr, low drag*, 6.5mm bullet retains 300 ft-lb of energy @1200 meters, what are the calculated muzzle velocity and terminal velocity?

*Assume BC of 123gr Sierra MatchKing?

[NugginFutz]

I wonder how their performance does compare.

If a 125gr, low drag*, 6.5mm bullet retains 300 ft-lb of energy @1200 meters, what are the calculated muzzle velocity and terminal velocity?

*Assume BC of 123gr Sierra MatchKing?

With 125 Grains, a G7 BC of .260 (123 SMK) and MV of 2900 fps, the following chart is modeled.

Range	Vel.	Energy	Elevation
m	fps	ft lbs	mils
0	2900	2335	0
100	2702	2026	-0.05
200	2511	1750	-0.58
300	2327	1504	-1.32
400	2152	1286	-2.18
500	1985	1093	-3.15
600	1824	923	-4.24
700	1670	774	-5.48
800	1522	643	-6.88
900	1380	528	-8.48
1000	1245	430	-10.32
1100	1121	349	-12.45
[B]1200	1046	304	-14.91[/B]
1300	1002	279	-17.74

[stanc]

With 125 Grains, a G7 BC of .260 (123 SMK) and MV of 2900 fps, the following chart is modeled.

Range	Vel.	Energy	Elevation
m	fps	ft lbs	mils
0	2900	2335	0
100	2702	2026	-0.05
200	2511	1750	-0.58
300	2327	1504	-1.32
400	2152	1286	-2.18
500	1985	1093	-3.15
600	1824	923	-4.24
700	1670	774	-5.48
800	1522	643	-6.88
900	1380	528	-8.48
1000	1245	430	-10.32
1100	1121	349	-12.45
[B]1200	1046	304	-14.91[/B]
1300	1002	279	-17.74

Many thanks for that. I kinda suspected that, given the 6.5 case size is the same as for 7.62, the performance might be a lot closer to 6.5 Creedmoor than to 6.5 Grendel.

[LRRPF52]

We've been talking about LSAT for years now.

I think the LMG definitely has the potential to go somewhere, and hope it does. The SAW has been an albatross for decades on the Infantry Squad, although it does provide firepower that a magazine-fed weapon simply can't. The weight of the SAW is way off the charts from what it should be, especially when you compare its weight to the PKM, which fires the 7.62x54R and is more reliable.

The LSAT LMGs weigh in the 10-12lb region, and ammo weighs a lot less.

If they are trying to push a 125gr to 2900fps though, that is most likely going to trash barrels too fast. They need to keep the pressures down and let the BC do the work.

[mongoosesnipe]

while the telescoping case is a current viable technology, i would really like to see caseless ammunition researched to be revisited