I thought the 6.5grendel was so much better than 308?

[k1dude]

The latest development in the 300blk has guys shooting those same 7.62 bullets out the 1000 yards. Not bad at all. Better option than a 6.5 Grendel IMO.

Not at all. Unless you think lobbing .300 rounds like they're mortars is flat shooting. The 6.5 Grendel far outperforms the .300 AAC at any range much less 1,000 yards. I question whether the .300 can even reliably reach 1,000 yards. The 6.5 Grendel is for distance and energy downrange out of the AR-15 platform. The .300 Blackout is ideal for hard hits out of suppressed weapons (subsonics) at short ranges using the AR-15 platform. And yes, I own both and really like both for different uses.

Straight from the mouth of the project lead at AAC "The 300 BLK and 6.5 (Grendel) could not be more opposites. While I see some merit in comparing 300 BLK to 6.8, I see little for comparing it to 6.5 - which is even longer range capable than 6.8.

I see 300 BLK as replacing the MP7, MP5, 10 inch barrel HK-416, Mk18, and for hunting and self-defense with an AR when you want 30 caliber bullets but don't want the size/weight, and expense of an AR10."

[Garyson1311]

I think its one of those things where one wants to try their best to mirror AR10 distance with an AR15 platform.

That being said, I will be building a 6.5 grendel next year.

[ar15barrels]

You can drive a 140 grain bullet to 3,100 fps with a 6.5 Grendel?

LOL, NO.
It takes a WSM or something burning 55+gr of powder to do that.

[ar15barrels]

I have heard this as well.

I wouldn't mind making a 6.5 upper but really in FL I have no use for it. I have thought that I will make one for CO hunting but I have not done so yet. So I am not knocking the 6.5 at all.

I was comparing 260 to 308, not 6.5 Grendel to 308.
You start 142gr matchkings at 2800 and 175gr matchkings at about 2650 in 24" long barrels.
You won't be able to push a 140gr bullet fast enough in a 6.5 Grendel to out-perform a 175 matchking from a 308.

[Nathan Krynn]

I don't have one nor have looked anything up on them.

I have a good customer in ID that builds them (he is a type 7) and he told me at 600+ typically (depends on specific load) the 6.5 had more terminal energy than a 308.

I just heard this though and do not own one. No need here in FL.

[ar15barrels]

I don't have one nor have looked anything up on them.

I have a good customer in ID that builds them (he is a type 7) and he told me at 600+ typically (depends on specific load) the 6.5 had more terminal energy than a 308.

I just heard this though and do not own one. No need here in FL.

178gr 308 Amax:

-------------------------------------------------------------------------------------
 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     3 fps
-------------------------------------------------------------------------------------
ˇYards   fps     s    ft.lbs.   in.    in.     MOA     in.   Clicks     MOA     yds ˇ
-------------------------------------------------------------------------------------
|    0  2625  0.0000   2723    -1.6    0.0   -----     0.0   ------    -----    0.00
M   81  2494  0.0949   2458    +0.1    0.4    0.49     1.7     -0.3    -0.12    0.09
X  100  2464  0.1177   2399     0.0    0.6    0.57     2.6      0.0     0.00    0.11
P  167  2359  0.2005   2199    -2.0    1.7    0.97     7.5     +3.4    +1.16    0.20
|  200  2308  0.2430   2105    -4.0    2.5    1.21    10.9     +5.6    +1.94    0.24
|  300  2158  0.3780   1841   -14.7    6.2    1.97    25.9    +13.7    +4.70    0.37
|  400  2014  0.5217   1603   -32.8   11.4    2.71    48.2    +22.8    +7.84    0.51
|  500  1874  0.6743   1389   -59.0   18.1    3.46    78.7    +32.8   +11.28    0.66
|  600  1743  0.8417   1200   -95.9   27.5    4.37   119.9    +44.4   +15.28    0.82
|  700  1618  1.0223   1035  -144.6   39.1    5.34   172.9    +57.4   +19.75    1.00
|  800  1500  1.2141    890  -205.9   52.8    6.30   238.4    +71.5   +24.60    1.19
|  900  1392  1.4205    766  -282.6   69.0    7.32   319.4    +87.3   +30.00    1.39
| 1000  1295  1.6450    663  -378.7   88.4    8.44   419.7   +105.2   +36.18    1.61

140gr 6.5 Amax:

-------------------------------------------------------------------------------------
 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     3 fps
-------------------------------------------------------------------------------------
ˇYards   fps     s    ft.lbs.   in.    in.     MOA     in.   Clicks     MOA     yds ˇ
-------------------------------------------------------------------------------------
|    0  2850  0.0000   2525    -1.6    0.0   -----     0.0   ------    -----    0.00
M   86  2718  0.0931   2297    +0.1    0.5    0.50     1.6     -0.2    -0.06    0.09
X  100  2697  0.1087   2261     0.0    0.6    0.57     2.2      0.0     0.00    0.11
P  177  2583  0.1965   2074    -2.0    1.8    0.97     7.2     +3.1    +1.08    0.19
|  200  2549  0.2234   2020    -3.1    2.3    1.08     9.3     +4.4    +1.52    0.22
|  300  2406  0.3437   1800   -11.5    4.9    1.56    21.6    +10.7    +3.69    0.34
|  400  2268  0.4722   1598   -26.0    9.0    2.15    39.9    +18.1    +6.23    0.46
|  500  2134  0.6092   1415   -47.4   14.6    2.78    65.2    +26.4    +9.07    0.59
|  600  2004  0.7538   1249   -76.2   21.5    3.42    97.9    +35.3   +12.14    0.74
|  700  1879  0.9064   1098  -113.1   29.8    4.07   138.7    +44.9   +15.45    0.89
|  800  1760  1.0726    963  -160.9   40.6    4.84   190.4    +55.9   +19.23    1.05
|  900  1647  1.2510    843  -220.6   53.4    5.67   253.9    +68.1   +23.42    1.22
| 1000  1539  1.4398    737  -292.6   68.1    6.51   329.8    +81.3   +27.96    1.41

[Bhobbs]

Oh lord no. I wish. I was more speaking about the 6.5 bullet vs the 7.62. Cartridges like the 260rem, 6.5CM, 6.5x55, 6.5x284. Sorry, Randell got me side-tracked and my mind drifted. I should have made that more clear.

The Grendel will never hit the speed to come close to matching a 308 in power. The latest development in the 300blk has guys shooting those same 7.62 bullets out the 1000 yards. Not bad at all. Better option than a 6.5 Grendel IMO.

LOL, NO.
It takes a WSM or something burning 55+gr of powder to do that.

That's what I figured. I was thinking how the hell could you do that? haha