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1000yd Benchrest Load Development

I use the chronograph and find a load and seating depth that shows low ES with a velocity I like. Then I move out to 600 or 1,000 yards and TURN THE TUNER. What that does is alter the nodal vibration pattern of the barrel. You can usually find the right tuner position that provides Alex's "positive compensation" and makes the smallest groups out there.

So you tune for the best accuracy with the tuner at 1000yd. What do you do if you need more accuracy yet?
Like say your getting low 4" groups at 1000yd, but your competition are shooting smaller, do you go back to 100yd and start over or what?

Myself, can't make a load shoot smaller then the optimal tuner settings and have to tune the load to get smaller/more accuracy. For me the optimal tuner settings remain the same after re-tuning the load.
Donovan
 
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You need to be shooting very small to see this stuff.

The difference in the peak of trajectory between a bullet (BC1=0.550) fired at 3000 ft/sec and another at 2990 ft/sec, assuming that both hit the same place on the 1000-yard target, is ~0.8" at ~600 yards downrange, or just over 0.1 MOA, which would require a very precise rifle to detect. For a bullet leaving the muzzle at 2980 ft/sec the maximum trajectory difference is about 0.25 MOA (vs. 3000 ft/sec), which would certainly be detectable with a good benchrest rifle and capable shooter.

At shorter ranges the absolute differences in trajectory are smaller, but the MOA difference is larger. For example, there is ~0.2 MOA difference between the 3000 ft/sec bullet and the 2990 ft/sec bullet from 100-300 yards downrange, and twice that much for the 2980 ft/sec bullet.

So it's easy enough to see that positive compensation can produce larger (MOA) groups at shorter ranges than at longer ranges near the convergence point, but as Alex says, it does take a benchrest rifle to observe it.
 
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Take the the vertical out with powder ladders at intended distance. Shape them with seating ladders at intended distance.

Below is 4 each at 3 different seating depths. Red are a bit wide, green are a bit tall, blue is just right.

View attachment 1019681

Of course I had to drive 2300 miles and wait till 2pm to get good enough conditions to test in.;)

Tom
Boy, I hope you brought a WSM for when the wind actually picks up?

Ray
 
I stopped trying to convince anyone a while ago. I just put the info out there and people can use it or not. I cant say I know of someone who has actually went out and tried it, that did not become a believer. Its actually pretty obvious when you see it work. I have seen many guys who have denied it instantly change their opinions when they seen it. I have not shot competitively in a few years, my advise is contact 1k BR shooters who are setting current records and winning consistently year after year barrel after barrel, and ask them how they tune. Most dont post it publicly because they get tired of arguing with people who have NEVER and WONT even try the methods they offer up. I have tried every common method of tuning.


You are right Alex, but bear in mind after two or three years of trying to make 4 different NF. comps work takes the fun out of it. It is hard to be competitive. I sure shot a lot of 4" 100's with the old 42 powers with a light gun. The only testing done at 1000 was at a match. Jim
 
I stopped trying to convince anyone a while ago. I just put the info out there and people can use it or not. I cant say I know of someone who has actually went out and tried it, that did not become a believer. Its actually pretty obvious when you see it work. I have seen many guys who have denied it instantly change their opinions when they seen it. I have not shot competitively in a few years, my advise is contact 1k BR shooters who are setting current records and winning consistently year after year barrel after barrel, and ask them how they tune. Most dont post it publicly because they get tired of arguing with people who have NEVER and WONT even try the methods they offer up. I have tried every common method of tuning.
Well spoken Alex. Agree 100 percent.
 

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