Originally Posted by beretzs
Originally Posted by antelope_sniper
Another interesting aspect about the Gren is the low SAAMI pressure spec of only 52K psi.

With a long sleek bullet, like the 129gr LRAB, it would mimic the effects of the longer throat of the 5.56/.223Wylde vs the .223. I commonly load the Wylde to 60K psi. With 748, that gets me to 2600fps in a 22" barrel, and 100% fill.

At my altitude, that keeps your velocity at 2k all the way out to 500 yards, and still above 1450fps at 1000 yards.

129gr bullet at 2600 out of a standard AR frame.....hmmmm, that could be interesting.


That’s my plan. Just got a 20” PSA upper and for this year I’m using the 123 ELD Hornady ammo, but once I get some time I wanna crunch up some 129’s cause if exactly what you mentioned.

I’ll take my chances with the Grendel cause I know it really isn’t a chance. grin


Beretzs,

Here's what the quick load for you 20" barrel looks like with the 129gr LRAB:

Code
Cartridge          : 6.5 Grendel  (SAAMI)
Bullet             : .264, 129, Nosler AccuBond LR 58943
Useable Case Capaci: 29.619 grain H2O = 1.923 cm³
Cartridge O.A.L. L6: 2.260 inch = 57.40 mm
Barrel Length      : 20.0 inch = 508.0 mm
Powder             : Winchester 748

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.786% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step    Fill. Charge   Vel.  Energy   Pmax   Pmuz  Prop.Burnt B_Time
 %       %    Grains   fps   ft.lbs    psi    psi      %        ms

-17.9   78    23.00   2028    1178   29952   6351     92.0    1.427
-16.1   80    23.50   2071    1228   31682   6515     92.9    1.394
-14.3   82    24.00   2113    1279   33512   6674     93.8    1.363
-12.5   83    24.50   2156    1332   35455   6827     94.7    1.332
-10.7   85    25.00   2199    1386   37513   6974     95.5    1.301
-08.9   87    25.50   2242    1440   39684   7114     96.2    1.267
-07.1   88    26.00   2285    1496   42014   7246     96.9    1.235
-05.4   90    26.50   2328    1552   44474   7371     97.5    1.204  ! Near Maximum !
-03.6   92    27.00   2370    1610   47089   7488     98.0    1.173  ! Near Maximum !
-01.8   94    27.50   2413    1668   49869   7596     98.5    1.144  ! Near Maximum !
+00.0   95    28.00   2455    1727   52828   7695     98.9    1.115  !DANGEROUS LOAD-DO NOT USE!
+01.8   97    28.50   2498    1787   55979   7785     99.3    1.088  !DANGEROUS LOAD-DO NOT USE!
+03.6   99    29.00   2540    1847   59341   7865     99.5    1.061  !DANGEROUS LOAD-DO NOT USE!
+05.4  100    29.50   2582    1909   62926   7935     99.8    1.035  !DANGEROUS LOAD-DO NOT USE!
+07.1  102    30.00   2623    1971   66757   7995     99.9    1.010  !DANGEROUS LOAD-DO NOT USE!
+08.9  104    30.50   2665    2034   70856   8043    100.0    0.986  !DANGEROUS LOAD-DO NOT USE!


And here it is with the 100gr NBT:

Code
Cartridge          : 6.5 Grendel  (SAAMI)
Bullet             : .264, 100, Nosler BalTip 26100
Useable Case Capaci: 32.965 grain H2O = 2.140 cm³
Cartridge O.A.L. L6: 2.260 inch = 57.40 mm
Barrel Length      : 20.0 inch = 508.0 mm
Powder             : Winchester 748

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.562% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step    Fill. Charge   Vel.  Energy   Pmax   Pmuz  Prop.Burnt B_Time
 %       %    Grains   fps   ft.lbs    psi    psi      %        ms

-15.6   83    27.00   2352    1228   31098   7116     88.8    1.242
-14.1   84    27.50   2397    1275   32692   7287     89.8    1.217
-12.5   86    28.00   2442    1324   34392   7454     90.7    1.193
-10.9   87    28.50   2486    1373   36176   7617     91.7    1.169
-09.4   89    29.00   2532    1423   38058   7774     92.5    1.143
-07.8   90    29.50   2577    1474   40046   7926     93.4    1.116
-06.2   92    30.00   2622    1526   42146   8073     94.2    1.090
-04.7   93    30.50   2667    1580   44365   8213     94.9    1.065  ! Near Maximum !
-03.1   95    31.00   2712    1634   46708   8347     95.6    1.040  ! Near Maximum !
-01.6   96    31.50   2758    1689   49198   8474     96.3    1.016  ! Near Maximum !
+00.0   98    32.00   2803    1745   51829   8593     96.9    0.993  !DANGEROUS LOAD-DO NOT USE!
+01.6   99    32.50   2848    1801   54620   8705     97.4    0.970  !DANGEROUS LOAD-DO NOT USE!
+03.1  101    33.00   2894    1859   57579   8808     97.9    0.948  !DANGEROUS LOAD-DO NOT USE!
+04.7  102    33.50   2939    1918   60722   8903     98.4    0.927  !DANGEROUS LOAD-DO NOT USE!
+06.2  104    34.00   2984    1977   64062   8989     98.8    0.906  !DANGEROUS LOAD-DO NOT USE!
+07.8  106    34.50   3029    2037   67617   9066     99.1    0.885  !DANGEROUS LOAD-DO NOT USE!

You didn't use logic or reason to get into this opinion, I cannot use logic or reason to get you out of it.

You cannot over estimate the unimportance of nearly everything. John Maxwell