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Range Report

1360 Views 4 Replies 3 Participants Last post by  chasw
4
Finished up my first AR build and its a 6.8 Spec. Thanks for the info provided here, really helped me out.
Anderson upper, lower, and parts kit. YHM 16" barrel, gas block, and flash hider.
Here she is at the local range with the three type of ammo fired. Scope for the test is a cheap Bushnell that I had laying around. I actually think its a $50 black powder scope, so not the best choice for accuracy, but it is what I had onhand. The scope mount is a Redfield that I found on Cabella's website on sale for $19. Seems like a decent mount.



First round, dont know where the casing went, never found it, but at 25 yards, the hole was next to the bullseye. Fired two more rounds, casing were dropping beside the gun. Looked at the target, and the first hole enlarged a bit, no other holes.

Moved to the 100 yard target and this is the first 3 round group on paper using the American Eagle. There was a 3 round group at the top where I had to adjust the sight down about 8"



Patched those holes up and tried the Hornady 110 gr V-max black on the left and 120 gr SST on the right. I shot a 3 round group for each, adjusted the sight and shot another 3 round group of each again



Considering a standard trigger, I am pretty happy with this grouping. I finished up with shooting 10 rounds in two strings at this target.



After the first couple of shots, the casing were ejecting to the 2:30 position and landing about 4 feet away. Really happy with this build. I will be upgrading the scope and trigger this summer, and hope to be into reloading also.
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Nice looking rifle. I was doing the same thing this weekend, testing ammo in a new 6.8 build. If photobucket doesn't freeze up on me, i'll post my results later tonight.
scoony: Good work, the accuracy is very good. However, your ejection pattern could be improved. Ejecting at about 2:30 indicates bolt speed is too high, thereby beating up your rifle a bit more than necessary. I suggest a heavier buffer to pull the pattern back to about 4 oclock. - CW
scoony: Good work, the accuracy is very good. However, your ejection pattern could be improved. Ejecting at about 2:30 indicates bolt speed is too high, thereby beating up your rifle a bit more than necessary. I suggest a heavier buffer to pull the pattern back to about 4 oclock. - CW
The tube and buffer came from a Rock River A2 stock kit.

I have seen mention of heavier carbine buffers, but do they make heavier rifle buffers? Going to start looking around for one.
The tube and buffer came from a Rock River A2 stock kit.

I have seen mention of heavier carbine buffers, but do they make heavier rifle buffers? Going to start looking around for one.
Yes, there are makers of heavy rifle-size buffers, check heavybuffer.com for an assortment. A better solution, would be to install adjustable gas, either at the gas block, or at the gas key. See Rubber City for the latter, a simple addition to your existing bolt carrier. With that you can dial in your favorite ammo to extract and eject as you prefer.

IMO, the AR-15 was designed to operate with rifle-size everything, barrel length, port position, receiver extension, buffer and spring. It seems the US military had to compromise a bit to get an adjustable length of pull. The 6.8 cartridge changes a few of those elements, namely shorter barrel and middy gas port, but otherwise, I recommend adust your gas pressure, if you can, rather than mess with the buffer. good luck - CW
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