2561 for a 20" barrel and 2525 for the 16" Ha! Its more like 2650 for the 20"and 2550 -2600 for the 16" What a crappy SAAMI 1:9.5 barrel would do has no bearing as the design was never what it was suppose to be nor what was created and tested by the mil group.
We were told that the case was so that anything over 16" was a waste we even had one company state anything over that woudl result in a vel loss :lol: but low gains turned out to be only with one very special powder specifically designed to work with 16 and under barrels as that was the mandate and then again even with that seems to be larger then was orginally thought. The average gain with normal powders going from a 16 to a 20 is 120 FPS.
Just because a group of people puts up a chart or spec with a comparison that clearly favors them as proof means nothing. That is why I say put up the best you got and let the chips fall where they may. When you do that the SPC shoots flatter then the G out to 600 yards with the same length barrels. Poepl;e sem to only wantto see one fator in drop whihc is BC. Eveyone is fixated on it yet many many times velocity will trump it until you stat to geet out to eal long ranges thatlets fae ae not shot at by 99.9% of people for whatever reason. That doesn't mean you can't pick a crappy BC 6.8 bullet and put it up against a great BC 6.5 bullet and MAKE the 6.5 the winner.
Here is a example of what velocity can do compared to a high BC but slower bullet. You will se how well that light fast 90 TNT does against the well know top performers with other cartridges.
viewtopic.php?f=1&t=3589
All that use to be said for the last 2-3 years when Constructor and I started showing performance gains was oh those are all way over pressure and unless you pressure test them its nothing but hot roding and you are going to blow up your gun. Well the loads are now pressure tested and guess what they are fine. In all that time and the many thousands of round even going beyond those loads not a single broken bolt. I am still using the same bolt I have and fully expect it to last the life of the barrel. Suddenly you never see those same statements from detractors anymore as it has no basis.
Then take a look at the 110 Accubond. All the shooting by Constructor and the small cc amount by me and others shows the drops to fall correctly when a .405 BC G1 factor is used. I can get 2800 FPS with it at 56K. Run those numbers thru JBM and see what you get and then compare that. The only comparison you will ever see from people that want to show the 6.8 is a short range cartridge is the 115 g SMK going 2525-2550. You will never see the AC, TNT, VMAX, TTSX
Also rememeber that the AC is really the first bullet specifically designed for the 6.8 and look at how well it does. The TNT is another that has is close but imagine as Paulo has suggested of adding a BT and then my suggestion of adding a poly tip and you have a 90-95 gr .320 3100fps laser out to 500-600 yards compared to jsut about anything out there.
We are getting vel from our 80-90 gr bullets that exceed what a .243 and 6mm Rem an get from the same weight bullets. They use 40% more powder
C put forth how he was getting good number with faster powder and oh the crys went out again. "You are crazy never can you use Rel 7" yada yada yada . Well now we have Hornady posting loads with AA1680 which is significantly faster. Norma 200 , H4198. In fact I know of one 8" barrel that is getting 2300 FPS from the 115 gr bullet using Norma 200. Hmmm
The 6.8 just keeps getting better and improving. We are starting to level off with what we can get using the best barrels specs, bullets, and current powders out there so we are waiting on the manufactures to catchup.
