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Long range load development at 100 yards.

OK this is more like it. My previous session on 1-11-2015 was a bust because I covered the chrono shades to protect the chrono from rain...uhh, don't do that. These numbers look about right. I wish I had loaded 57gr. to nail down the 56.5 node.
For 1-18-'15 (bottom 2 rows)
54.5 - Av=2771,SD=14.2,ES=26
55.0 - AV=2771,SD= 3.5,ES= 7
55.5 - AV=2800,SD=10.7,ES=19
56.0 - AV=2850,SD= 7.0,ES=14
56.5 - AV=2873,SD= 4.5,ES= 9
 

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Killick said:
OK this is more like it. My previous session on 1-11-2015 was a bust because I covered the chrono shades to protect the chrono from rain...uhh, don't do that. These numbers look about right. I wish I had loaded 57gr. to nail down the 56.5 node.
For 1-18-'15 (bottom 2 rows)
54.5 - Av=2771,SD=14.2,ES=26
55.0 - AV=2771,SD= 3.5,ES= 7
55.5 - AV=2800,SD=10.7,ES=19
56.0 - AV=2850,SD= 7.0,ES=14
56.5 - AV=2873,SD= 4.5,ES= 9

Much better. I would load between 56.0 and 56.5 for now since you don't know what 57.0 would do. Load 56.3 and adjust seating depth. Look like it will be a shooter.
 
Ok. I need a little help with this load work up. I'm using 168 Berger Hybrids 0.020" off the lands in my 308 Win with IMR4064 powder and Tula primers. I didn't use a chronograph, but I have a Magnetospeed that I will use to measure velocity of my final load. I like 44.6 but I need a second opinion. The vertical alignment is not as good as I would like.
 

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My concern with choosing 45.4 gr is I run into pressure signs at 46.0 gr, and I shot this load test when it was 52°. On a different note, is a flat group better than one that has a round shape?
 
Has anyone found that seating depth stays the same even when switching to a new powder, or do you usually run a whole new seating depth test after the new powder test?
 
BCoates said:
Ok. I need a little help with this load work up. I'm using 168 Berger Hybrids 0.020" off the lands in my 308 Win with IMR4064 powder and Tula primers. I didn't use a chronograph, but I have a Magnetospeed that I will use to measure velocity of my final load. I like 44.6 but I need a second opinion. The vertical alignment is not as good as I would like.

I would go with 45.2, which puts you in the middle of two good groups.
 
LitLBoy said:
I'll vote for 45.4 Great water line
LitLBoy

"Waterline" is an imaginary horizontal line across the center of the target. What you mean I assume is that the load has very little vertical?
 
Erik Cortina said:
BCoates said:
Ok. I need a little help with this load work up. I'm using 168 Berger Hybrids 0.020" off the lands in my 308 Win with IMR4064 powder and Tula primers. I didn't use a chronograph, but I have a Magnetospeed that I will use to measure velocity of my final load. I like 44.6 but I need a second opinion. The vertical alignment is not as good as I would like.

I would go with 45.2, which puts you in the middle of two good groups.

Thank you Erik. I need to adjust my seating depth next, but 0.020" off looks pretty good. Some of the horizontal spread to the groups is because of me, so I don't know how much smaller the groups will get.
 
ok this is from fine tuning of my 6BR using 105gr berger hunting vlds with 29.5gr of reloader 15, I did some bigger seating depth before this and saw 2 that looked good, around .020 off lands and .050 off lands
this is the results
going to test .020 and .050 at 500m when my next fly shoot is on (as you can see at .050 my rest came lose on the 1st 2 shots ::)) and I wouldn't mind testing at .056 to see if its still gets good groups but I know .060 wasn't that good from original testing
black pen is the group size centre to centre



now the .020 I did get one out of the group of 4 :-[ which I think was me, but the group of 4 measured .164
 
comagutsa said:
ok this is from fine tuning of my 6BR using 105gr berger hunting vlds with 29.5gr of reloader 15, I did some bigger seating depth before this and saw 2 that looked good, around .020 off lands and .050 off lands
this is the results
going to test .020 and .050 at 500m when my next fly shoot is on (as you can see at .050 my rest came lose on the 1st 2 shots ::)) and I wouldn't mind testing at .056 to see if its still gets good groups but I know .060 wasn't that good from original testing
black pen is the group size centre to centre


Between .050" and .053" looks good.
now the .020 I did get one out of the group of 4 :-[ which I think was me, but the group of 4 measured .164
 
jlow said:
Sorry you are getting frustrated, but it is certainly understandable…

I think the fliers unfortunately are always hard to diagnose because as already listed, quite a few thing can contribute and without being there next to the gun and reloading, it’s always a bit hard to daignose. I would agree that neck tension is usually a culprit and I hope that fix with the rear action screw will also help. The good news is your SDEV looks very good and that to me says that your neck tension is likely good which in my opinion is not a small thing...

Personally I find QuickLoad a great help as it is amazingly accurate predicting where the accuracy node is if you take time to put in the correct and accurate information it needs. Knowing where you need to be really helps to avoid that “swimming in the big ocean and not knowing where the hell I need to be” feeling. It takes time to learn but in the end it will help you a lot to save time, material, and frustrations.

Could you provide more info and how to get to the accuracy node faster with Quickload?
 
Waldo, First you would need to read Chris Long's theory and decide if you 'believe'. If so, using various fudge-factors and tweaks, careful measurements, steep learning curve using the program, some reverse-engineering using proven chrono data, you may get a feel for it. Seymour
 
BY1983 said:
Heres a little harder one to decipher...

I like 35.7 but maybe load a little towards 35.9 since the groups are flat in that direction and vertical the other way. Maybe 35.8 gr.
 

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