PLEASE DECIPHER THESE RESULTS!! Very frustrating.

[lrgrendel]

24" 6.5 Grendel. Hornady 123 AMAX. Lapua brass. AA 2520 powder (used for first time) CCI 450 primers.

80 deg. 65% humidity. Wind 10 to 15 mph from 1.30pm.

Probably shouldn't be trying to load develop in this wind but.....

All from 200 yds.

Last photo is the chronograph results.

Did shoot 2 Varget groups at 100 yds ( both less that 1 MOA )

Could someone spend a little time and give me some insight in what they see here.

Thanks.

 

[Mod Adahy]

I think a ladder test is in order. Hard to decipher. No chrono results, not that they help but no need chasing a load that is on the slow end. I had great luck with 8208, have you tried any of the xbr?

 

[timjoebobbradley]

any chance on target four or five you did something different? I see two groups with very little elevation, but a lot of wind, and a single "flyer" for photo 4 and a little more spread for #5

go shoot a couple more groups at 28.8 in better wind.

 

[scudzuki]

Better yet, run an OCW test at 100 yards.
I've found ladders to be less conclusive; a single shot at each charge weight is not enough data.

Joe

 

[lrgrendel]

Azprc

Sorry the system would only let me upload 5 photos. The chrono results are posted about 10 threads later.
Yes just bought 8 lbs of IMR 8208. Will try this next but wanted to test my AA 2520 first. I only have 1 lb of the 2520.
Thanks

 

[gunsnjeeps]

What's the velocity for your Varget loads? I'd look in the same neighborhood for your other loads.

 

[oldfatguy]

Better yet, run an OCW test at 100 yards.
I've found ladders to be less conclusive; a single shot at each charge weight is not enough data.

Joe

^^^^^^^^^^^^^^^^ This ^^^^^^^^^^^^^

OFG

 

[gvanhyning]

+1 for 100 yards on an OCW test.

 

[Dan Newberry]

I agree with the notion at 28.8 grains... the wind could have really messed you up on that node, especially at 15mph (even if it was quartering toward/away from you)...

You ought to use smaller graduations than .4 grains... use .3 at the largest.

If there's a node at 28.8 grains, there should be another at around 29.7 or somewhere around there.

Check your published load data before trying 29.7...

Dan

 

[lrgrendel]

Thanks for the replys

 

[P7id10t]

Was the wind increasing as you ran your tests?
Note 20.0 to 20.4 tightens up on the vertical dispersion, with 28.8 being the best, then horizontal dispersion opens up more. I would expect greater horizontal with lower charges in constant cross wind.
+1 to 28.8 node

 

[rgky1]

Load data with 2520 goes up higher than 29.2 grains with the 123 A-Max. Just watch for pressure if going higher. I shoot 30.2 grains in my 24" heavy barrel. New Lapua or fired and resized Lapua? I get about 70-75 fps less using new Lapua brass than once fired Hornady brass. New Lapua brass I've checked has the shoulder pushed back farther than Hornady factory loaded brass. Here's a very good article on vertical dispersion:
CURES for VERTICAL STRINGING

 

[rduckwor]

28.4 - 29.2 look good vertically. The horizontal is likely wind.

I would work that range in smaller increments to really nail it down.

Good Luck,

 

[lrgrendel]

Great responses guys thanks.
I tried to include these 2 photos originally but the system wouldn't let me.
There might be some other hidden info here.

 

[lrgrendel]

P7id10t

Funny you should say that but yes it did.
And the direction changed too. It was originally right behind me at about 5 to 7 mph.

Great thought

 

[scudzuki]

P7id10t

Funny you should say that but yes it did.
And the direction changed too. It was originally right behind me at about 5 to 7 mph.

Great thought

I'd agree, too much wind that day for an effective test... too hard to decipher the results without knowing what the wind was doing at the time each group was shot.

It explains the horizontal stringing, though.

Joe

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