Maybe your QL hasn't been updated in a while. I think I bought my last update three or four years ago...there just isn't enough added each time a new update is offered to make it worth the cost IMO. Ayway, I found that my QL does include the Endurons so I ran it for you. I assumed a 24-inch barrel.
Because I have absolutely NO experience with this cartridge, and since I have no idea what your experience with QL is, I'd like to tell you how I use QL to stay out of trouble (with good success so far): I pretty much just look at the velocity corresponding to the highest pressure I'm willing to accept (in this case I'd probably choose to limit my loads to about 3125 +/- a few fps based on QL results). I would also look at all the other data available to see if the result appears to be plausible...for instance, I would not expect 7977 to yield 200 fps more than 7828.
Don't mean to appear to be talking down to anyone...I'm just not willing to assume anything at all.
Hope this is helpful!
Cartridge : 6.5 x 68
Bullet : .264, 127, Barnes 'LRX'BT 30228
Useable Case Capaci: 77.098 grain H2O = 5.006 cm³
Cartridge O.A.L. L6: 3.405 inch = 86.49 mm
Barrel Length : 24.0 inch = 609.6 mm
Powder : IMR 7977 Enduron
Predicted data by increasing and decreasing the given charge,
incremented in steps of 0.185% 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
-01.9 97 68.51 3051 2625 58516 13806 93.8 1.186
-01.7 98 68.64 3057 2636 58874 13835 93.9 1.182
-01.5 98 68.77 3063 2646 59235 13863 94.0 1.179
-01.3 98 68.89 3070 2657 59597 13891 94.1 1.176
-01.1 98 69.02 3076 2668 59963 13919 94.2 1.172
-00.9 98 69.15 3082 2678 60330 13947 94.3 1.169
-00.7 99 69.28 3088 2689 60700 13974 94.4 1.166
-00.6 99 69.41 3094 2700 61072 14002 94.5 1.163
-00.4 99 69.54 3100 2710 61446 14029 94.5 1.159
-00.2 99 69.67 3106 2721 61823 14056 94.6 1.156
+00.0 99 69.80 3112 2732 62203 14084 94.7 1.153
+00.2 99 69.93 3119 2742 62584 14111 94.8 1.149
+00.4 100 70.06 3125 2753 62969 14138 94.9 1.146
+00.6 100 70.19 3131 2764 63355 14164 95.0 1.143
+00.7 100 70.32 3137 2775 63745 14191 95.0 1.140
+00.9 100 70.45 3143 2786 64136 14217 95.1 1.136