Build advice on first 6.5G bolt gun

[jason miller]

How'd they do grouping at 1K?

Your bullets go transonic (1,340fps) at 960yds.

I never shot them at 1,000 yards, just like I bet you haven’t. But just because a bullet is slipping into the transonic zone, or even past the sound barrier and out the other side, doesn’t mean that they always lose stability and/or accuracy. Besides, 960 yards is damn close to 1,000- and this was with a short barrel at fairly low elevation. Add 4” of barrel for ~100 FPS on a custom build, as the OP mentioned, or move back to 7,500 feet ASL where I lived when I originally bought this rifle, and it’s a whole new ballgame.

Since you like to post about what the Grendel can and can’t do at long range, I wonder- do you have any actual experience at 1K and/or with heavier 140-class bullets?


Edit to add- the speed of sound is variable depending on air density. Keep in mind that at 1,000 feet and 75-95 degree temperatures, the speed of sound will be lower than the 1,116 FPS “standard”, and therefore so will be the upper threshold of the “transonic zone” mentioned.