[doorgunner69]

What is the 6.5 ammo weight? That was a huge issue with the M-14 if you wanted a decent amount with you.

[Elderberry]

What is the 6.5 ammo weight? That was a huge issue with the M-14 if you wanted a decent amount with you.

6.5 Grendel

I measured 274.8 grains for a round with a 130gr bullet.

I measured 271.8 gr for a round with a 123 gr bullet.

I didn't have any 223 to compare it to.

[Elderberry]

http://www.thefirearmblog.com/blog/2016/04/09/how-much-does-your-ammunition-weigh/

[Bogey78O]

Bullet weight runs from about 90gr to 129gr.