I have had good luck with my CMMG
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6.8 vs. 300 Blackout
- Thread starter Go Navy!
- Start date
I would go with 300blk . . . I've shot a 9" barrel with a sdn6 can on the end and its very hearing safe with subsonic. The .223 case swings largely in its favor.
under 100 yds the 300 blk wins hands down. 308 ar's will give you better ballistics but they are much larger than a 5.56(300 blk platform).
you can buy surplus 308 ammo but it still is not cheap. you can buy 300 blk ammo for about 16$ for 20 rnds of decent ammo to included sub sonic so its not more expensive than regular 308 ammo.
6.8 has better long range ballistics but thats it. 6.8 requires more gun parts with different magazines and has much less factory support than the 300blk to included ammo.
Im doing a short barrled 300blk build myself with a suppressor.
you can buy surplus 308 ammo but it still is not cheap. you can buy 300 blk ammo for about 16$ for 20 rnds of decent ammo to included sub sonic so its not more expensive than regular 308 ammo.
6.8 has better long range ballistics but thats it. 6.8 requires more gun parts with different magazines and has much less factory support than the 300blk to included ammo.
Im doing a short barrled 300blk build myself with a suppressor.
pro and cons have pretty much been outlined here.. the 300 is basically a 7.62X39 AK round that will feed in an AR.. so it will shoot beyond 100 yards...
ammo prices are going to drop as the cartridge is very popular right now. just try and find a barrel that isn't $400... they are all out of stock till next month(hopefully).
I'm building one....on a new Frontier Armory LW15 lower(poly) that I just got.
ammo prices are going to drop as the cartridge is very popular right now. just try and find a barrel that isn't $400... they are all out of stock till next month(hopefully).
I'm building one....on a new Frontier Armory LW15 lower(poly) that I just got.
I have read everything I can get my hands on about both. Personally, I am going with the 300 when funds permit. Like jglenn said above, 300 is close to 7.62x39 and people have been saying 7.62x39 is a 100-150 yard cartridge for years... they are wrong. Go to warriortalk forums and read what Gabe Suarez has to say about the effective range of the 7.62x39.
its not that the round isnt effective it just drops like a rock after about 200 yrds. the rifle more of lobs it out.
read this
Load Data
~~~~~~~~~
Name: 300
Ballistic Coeff: 0.618
Bullet Weight: 220
Velocity: 1050
Target Distance: 100
Scope Height: 1.500
Temperature: 70
Altitude: 600
Ballistic Data
~~~~~~~~~~~~~~~
Range Elevation Velocity Energy ETA
0 yds -1.50 in 1050 fps 539 fpe 0.000 sec
25 yds 1.92 in 1040 fps 529 fpe 0.072 sec
50 yds 3.34 in 1031 fps 519 fpe 0.144 sec
75 yds 2.71 in 1022 fps 511 fpe 0.217 sec
100 yds 0.00 in 1014 fps 502 fpe 0.291 sec
125 yds -4.81 in 1006 fps 494 fpe 0.365 sec
150 yds -11.81 in 998 fps 486 fpe 0.440 sec
175 yds -20.85 in 990 fps 479 fpe 0.515 sec
200 yds -32.14 in 982 fps 471 fpe 0.591 sec
225 yds -45.72 in 975 fps 464 fpe 0.668 sec
250 yds -61.61 in 968 fps 458 fpe 0.745 sec
275 yds -79.86 in 961 fps 451 fpe 0.823 sec
300 yds -100.48 in 954 fps 445 fpe 0.901 sec
super sonic
The 125 Match ammo has a 0.320 BC, and is typically at 2230 fps from a 16 inch barrel. This is currently the most likely military ammo.
Range Velo Time of Energy Path Deflection Total Sight correction Target
city flight to at crosswind drop for setting new lead
LOS of 10.0 Mph zero range 33 fps
-------------------------------------------------------------------------------------
·Yards fps s ft.lbs. in. in. MOA in. Clicks MOA yds ·
-------------------------------------------------------------------------------------
| 0 2230 0.0000 1380 -2.5
| 50 2107 0.0694 1232 -0.3
X 100 1988 0.1421 1097 0.0
| 150 1872 0.2192 973 -1.8
| 200 1762 0.3026 862 -6.3
| 250 1657 0.3914 762 -13.6
| 300 1557 0.4850 673 -24.0
| 350 1462 0.5832 593 -37.8
| 400 1375 0.6892 524 -55.9
| 450 1295 0.8020 466 -78.7
| 500 1223 0.9209 415 -106.5
| 550 1161 1.0470 374 -140.5
| 600 1108 1.1793 340 -180.8
-------------------------------------------------------------------------------------
read this
Load Data
~~~~~~~~~
Name: 300
Ballistic Coeff: 0.618
Bullet Weight: 220
Velocity: 1050
Target Distance: 100
Scope Height: 1.500
Temperature: 70
Altitude: 600
Ballistic Data
~~~~~~~~~~~~~~~
Range Elevation Velocity Energy ETA
0 yds -1.50 in 1050 fps 539 fpe 0.000 sec
25 yds 1.92 in 1040 fps 529 fpe 0.072 sec
50 yds 3.34 in 1031 fps 519 fpe 0.144 sec
75 yds 2.71 in 1022 fps 511 fpe 0.217 sec
100 yds 0.00 in 1014 fps 502 fpe 0.291 sec
125 yds -4.81 in 1006 fps 494 fpe 0.365 sec
150 yds -11.81 in 998 fps 486 fpe 0.440 sec
175 yds -20.85 in 990 fps 479 fpe 0.515 sec
200 yds -32.14 in 982 fps 471 fpe 0.591 sec
225 yds -45.72 in 975 fps 464 fpe 0.668 sec
250 yds -61.61 in 968 fps 458 fpe 0.745 sec
275 yds -79.86 in 961 fps 451 fpe 0.823 sec
300 yds -100.48 in 954 fps 445 fpe 0.901 sec
super sonic
The 125 Match ammo has a 0.320 BC, and is typically at 2230 fps from a 16 inch barrel. This is currently the most likely military ammo.
Range Velo Time of Energy Path Deflection Total Sight correction Target
city flight to at crosswind drop for setting new lead
LOS of 10.0 Mph zero range 33 fps
-------------------------------------------------------------------------------------
·Yards fps s ft.lbs. in. in. MOA in. Clicks MOA yds ·
-------------------------------------------------------------------------------------
| 0 2230 0.0000 1380 -2.5
| 50 2107 0.0694 1232 -0.3
X 100 1988 0.1421 1097 0.0
| 150 1872 0.2192 973 -1.8
| 200 1762 0.3026 862 -6.3
| 250 1657 0.3914 762 -13.6
| 300 1557 0.4850 673 -24.0
| 350 1462 0.5832 593 -37.8
| 400 1375 0.6892 524 -55.9
| 450 1295 0.8020 466 -78.7
| 500 1223 0.9209 415 -106.5
| 550 1161 1.0470 374 -140.5
| 600 1108 1.1793 340 -180.8
-------------------------------------------------------------------------------------
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im glad the OP opened this thread....i was trying to decide between these 2 as well but knew nothing about them. now i dont really want either lol.
300 Blackout. Get S&W quad rail free float upper for under $700.
