So as the title says I’m this -><- close to choosing 6.8 SPC vs 6.5 grendel. I took a couple of factors into deciding .300blk vs 7.62x39 as my first alternative caliber for AR-15 platform. I chose 7.62x32 for ammo availability and cost. Performance is similar but debatable. I couldn’t be any happier with the decision.

So with the next build I’m looking at alternatives for more punch vs 5.56mm. Research leads to 6.5mm Grendel vs 6.8mm SPC. For this I think I’m going to choose 6.8mm SPC and keep the barrel at 16”. For similar reasons as above, 6.8mm SPC seems to be viable. I believe the NGSW is also going to smiler size 6.8mm. With either its hard to go wrong. Your thoughts on one or the other?