Originally Posted by drenge
That is an interesting theory. I'd be very curious to see what your results are tomorrow at longer range. Let me know what happens. I'm shooting in a higher altitude (which usually changes the station pressure) so I wonder if the lighter bullets will be easier to work with. I'm using H4831sc in a 7mm RM with the 168 vlds. I have been unable to shoot because my rifle is with my smith getting some work done.
Usually I'm at 6,000 ft plus when I shoot. If the 4831 doesn't work well maybe I'll go to the H1000 or Retumbo to see if the slower burning powder helps at all...and of course play with my seating depth. I think it's correct to assume that if you can get your bullet to stabalize at a shorter distance you're going to have better accuracy.
We shot today for BC but did not get the sterile shooting conditions conducive to peak accuracy. We did not set out wind flags and the spring winds were blowing today, we shot at high noon for the chronograph, only shot one shot every 15 minutes for maintaining the barrel cool, walked 400 yards to and from the target after each shot while checking the chronograph. We didn't get any surprises in the accuracy department as even with all the above accuracy robbing conditions and situations, the shots went into groups way under .5" at 200 yards. I am sure it would have been better had we had more advatageous conditions.
What we were extremely happy about today was not the just the consistent groupings, but the calculated and confirmed sea level BC of .878 for greyghostt's 280 grain bullet. These bullets (265s and 280s) have not fouled barrels even when pushed hard. This BC allows my 338/378 (3125 fps with the 280 grain projectile) with to trail the trajectory perfomance of the 338/408 Cheytac (3250 fps with 300 SMK) by only .5 moa at 900 yards but it allows me to beat it by .3 moa windage at 900 yards.
I am sure the performance out of a 338/408 Cheytac case would be impressive, but am also releived that I do not have to go to a barrel eating Cheytac case for great ballistic performance.
Greyghostt has been building custom bullets for over 20 years and I have to say that they are extremely impressive.
If you require additional information on our testing or his bullets, drop me an email at email@example.com