Post by GLSHOOTER on Jun 28, 2013 15:00:28 GMT -8
I just thought I'd post this up as I have been playing with it for a couple months. I started shooting 500 yard F-Class matches last year and have done pretty well for a beginner in that venue learning more about wind and mirage. I've shot the 6X45, the 6X68 and the 243 LBC BHW barrels and done well. Each movement up has helped in the score but then I am learning more so it is probably coincidental and not a direct cause and effect on the score.
The X ring is only 2.5" and the 10 ring is 5" at 500. Quite a challenge for any AR15 on the market. I'm averaging around 95% so a few more and I'll be right up their in the higher groups. I'll shoot along with 4-5X's and 6-7 10's and all of a sudden throw an 8. It looked and felt good and there in lies the rub. What happened? Research and talking with the other shooters led me to believe an out of spec round might well be the culprit.
We know that straight ammo loaded with the right stuff shoots better. The run out on the rounds is easy to determine in several ways it just costs $$'s. I have Sinclair Concentricy Tool but it just gave me numbers to sort by. It solved nothing for the bad ammo. A run out of 0.003 or less is desirable and the closer to 0.000 you get the better you will do. The Hornady tool checks the run out and will allow you to "straighten" the rounds.
One that is 0.008 out of round is not going to do well compared to the 0.001 individuals. I started checking my loads and found that the Reddings seaters, spring loaded, do well and hover around 0.0015 average. The Hornady seater does about 0.0025 and the RCBS I have checked looked at 0.00275 average. Lots of god stuff but I wanted to get down around or below 0.002 for my personal standard.
Here is the tool.
The saddle area set up to check run out with the micrometer. The little knob on the bottom is the "pusher" to let you straighten the round.
Gauge set at 0.000 at its lowest point.
Gauge showing approx. 0.002 run out. (204 Ruger BTW)
I left this one alone. Getting them under my 0.002 cut off is easy once you start using the pusher. I see about 95% of what I load being 0.002 or less with many way under 0.001. I haven't shot these on paper but the PD's I shot with the gauged ammo seemed to fall pretty well. I'll post up my next match results with the tweak on.
Greg
The X ring is only 2.5" and the 10 ring is 5" at 500. Quite a challenge for any AR15 on the market. I'm averaging around 95% so a few more and I'll be right up their in the higher groups. I'll shoot along with 4-5X's and 6-7 10's and all of a sudden throw an 8. It looked and felt good and there in lies the rub. What happened? Research and talking with the other shooters led me to believe an out of spec round might well be the culprit.
We know that straight ammo loaded with the right stuff shoots better. The run out on the rounds is easy to determine in several ways it just costs $$'s. I have Sinclair Concentricy Tool but it just gave me numbers to sort by. It solved nothing for the bad ammo. A run out of 0.003 or less is desirable and the closer to 0.000 you get the better you will do. The Hornady tool checks the run out and will allow you to "straighten" the rounds.
One that is 0.008 out of round is not going to do well compared to the 0.001 individuals. I started checking my loads and found that the Reddings seaters, spring loaded, do well and hover around 0.0015 average. The Hornady seater does about 0.0025 and the RCBS I have checked looked at 0.00275 average. Lots of god stuff but I wanted to get down around or below 0.002 for my personal standard.
Here is the tool.
The saddle area set up to check run out with the micrometer. The little knob on the bottom is the "pusher" to let you straighten the round.
Gauge set at 0.000 at its lowest point.
Gauge showing approx. 0.002 run out. (204 Ruger BTW)
I left this one alone. Getting them under my 0.002 cut off is easy once you start using the pusher. I see about 95% of what I load being 0.002 or less with many way under 0.001. I haven't shot these on paper but the PD's I shot with the gauged ammo seemed to fall pretty well. I'll post up my next match results with the tweak on.
Greg
