The ballistics look like the 6.5 grendel out of "combat" length barrels is not really any better than the 300 BLK. Of course, I realize that's not going to happen now, not with the high bucks that have already been committed to the 300 BLK. 280 British data together with modern powders and bullets would make for even more impressive results over the British experience. The 7x35mm, or 7mm Whisper, was designed as a suppressed round. 30 caliber bullet is to satisfy those that think that caliber is somehow sacred in America. I suspect the real reason for choosing the. I can't wait until I can get ahold of a barrel and some ammo to give it a shot (I know bad pun).Actually, what I demonstrated is that if keeping the 5.56x45mm case head diameter is a basic criteria, then either the 6.5x35mm or 7x35mm Whisper rounds would have been a better choice than the 7.62x35mm. Fastpat just showed me why there is no need for me to even consider 6.5 grendel as a patrol rifle round. I bet that 300 BLK will outperform 6.5 grendel out of an SBR barrel. But while the 24" barrel data is impressive, who carries around 24" barreled weapons? This data shows the extra 8" of barrel is good for about 150 yards improvement. Much of the Grendel's reputation for down range performance has come about from using much longer barreled weapons. It has a better BC bullet, so it will carry better down range, but it's still being launched at under 2400 fps. When launched from 16" barrels, the Grendel barely improves upon the starting velocity of the Blackout. for a subsonic round available? Interesting info about the 7mm Whisper on Jane's Ammunition Handbook web site.And herein you've just highlighted how in similar setups, the Grendel isn't the end all, be all platform. 280 British demonstrated, the 7mm bore is more efficient, possibly the best compromise of ballistic coefficient versus bullet weights available to us. 30 bore to go to heavy projectiles for subsonic function, but as the old. Image from the 300 AAC Blackout web site, Whisper image from SSK Industries web site. The major issue when compared to the 300BLK is the Grendel mag capacity is "only" 25 rounds, whereas the 300BLK is 30 rounds. Grendel rounds do not feed much at all from a 5.56 magazine. 6.5 Grendel bolts last the normal expected life of an AR bolt.
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