I have been loading H-1000 with the 168 TSX out of a .300 Win.mag.with great success.Decided to try the new 165 Accubond with the same powder,primer,and brass.Worked up to 83 grs. of H-1000 for a velocity of 3163 fps.I was hoping for 3200 fps. as with the TSX load.I called Hodgdon and they said go to 84 grs. of H-1000 with the 165 Accubond and that the compressed load would be well within their safe pressure limits.Anyway,loaded the 84 grs.of H-1000 and the velocity didn't even reach what was attained with 83 grs.(84 grs.,3148 fps.).What gives???The temperature was 97 degrees,but the barrel and ammo was kept at room tempts.Can anyone help me out or should I retest the load?
Jimmy
Hoping to use a temp.insensitive powder.My question is why the 165 Accubond has less velocity than the 168 TSX with an equal or greater powder char1 gr. over the TSX load)?I have had the desired velocities with the TSX,but can't obtain it with the Accubond.Could it be a greater bearing surface with the Accubond?83 grs.of H-1000 results in 3195 fps with the TSX,the same load with the Accubond is 3135 fps.
Well, I am getting 3216 with Hornady Interbonds with 77 gr IMR 4831. Maybe you could try working up to that and check your velocities. I was getting 3190 at 50F and 3216 at 85F. Not sure what part of the country you are in to know if that matters, but on the other hand, is 60 fps significant? I suspect the bc of the NAB is better than the TSX, and by 500 yards exceeding the TSX's ballistics. JMO
Thanks.I am not all that concerned about 60 fps,but was trying to get some insight as to why the varience exists.It seems to me that the 165 would have at least the same velocity as the 168.
Jimmy [img]/ubbthreads/images/graemlins/confused.gif[/img]
Compare the bearing surface of the bullets. The longer bearing surface'd bullet may be slower. Jacket type is also a variable. Also you my want to try shooting through about a yard square piece of paper about 4 or 5 feet ahead of the muzzle to see how much powder isn't buring in the barrel.
1 gr. over the TSX load)?I have had the desired velocities with the TSX,but can't obtain it with the Accubond.Could it be a greater bearing surface with the Accubond?83 grs.of H-1000 results in 3195 fps with the TSX,the same load with the Accubond is 3135 fps.
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