06-12-2013, 04:11 PM
LR1955 Wrote:Here we go again....
How to make a Grendel cartridge longer but not wider that still fits within the limitations of a AR-15 Magazine? Eliminate the shoulder or neck. Since that won't work, you have hit your limits.
You want something that will outperform the military versions of the 7.62 but still retain the Grendel case? Neck the Grendel down to 6mm and shoot 6mm bullets. Will that ever be done? No.
I can imagine the need for a quadrant sight if someone wants to shoot a ball 140 grain bullet from a 16" barrel Grendel. A 140 is too long and too heavy for the cartridge capability. In other words, a 140 using current materials is a horribly inefficient bullet to shoot using a 30 grain cartridge that is restricted by magazine length. Not to mention pressures. Sure, guys shoot the 140s. And they have to hot load them to dangerous levels just to get early 20th century velocities out of them.
The facts are that unless something radical changes in terms of propellent or bullet material, you won't get the increases in lethality that would justify billions of dollars being spent on something new. It isn't even logistics. It is money and money that is better spent on things other than trying to improve early 20th century technology that has already hit a 97% capability if not more.
LR1955
The question is whether we should continue to stay with the limits of the M16 magazine or lengthen the case thus going with a new platform and magazine? As for diameter, it appears that 10.5 mm seems to be the right size. Thus only length should be adjusted. As for the 140 gn bullet, that does fit into a .308 case (260 Rem).