Help with 6mm A-TIP loading

[normmatzen]

I have been shooting long range Bench Rest for the last 10 years with moderate success. I shoot a 6BRX for light gun and recently tried a box of 110gr A-TIP. I have been recently been shooting ELD-M in 6mm with success, but the geometry of the A-TIP is VERY strange wrt the ELD-M. The A-TIPseems to havwe a very long tip. The bullet is 0.115" longer than the ELD-M but the base to ogive is 0.050" shorter!
What seems to work as far as jump or jamb?

 

[normmatzen]

Well, while trying out some theoretical QL loads for my 6BRX, I included 5 shots with 110gr A-TIP in addition to a 5 load, 5 shot round robin with ELD-M 108gr.
It seems the ELD-M needs a bit more speed than I loaded for .
BUT

The 5 shot group of A-TIP in front of 34.6gr of RL-16 produced 2841 fps with an sd of 2 and ES of 5.
This is the best sd/ES I have ever had in barrel characterizing! They shot a 3.5" group at 600 yd with out really trying! ( I was mainly looking for velocity). Jammed 0.010"

Now I am waiting for the holidays to be done with so I can get back to loading and shooting!

 

[Dusty Stevens]

What twist barrel?

 

[johara1]

I'm using a 7 twist barrel and I start in to a square mark and back out .002 at a time atill it shot an .021 at 100 and then I started up on powderES stayed at 6 or down to 1, they just shoot a hole, maybe I got lucky. They shoot from 2890 to 2911 from the 6mm br imp.so far, cold and snow will need to wait till spring to tell you more..... jim

 

[normmatzen]

My barrel is a 1 in 8 from X-Caliber. Note, I have used Shilen, Bartlain and now I have two X-Caliber and all have shot essentially the same.
The data above was at 600 yd and no sign of instability. I'll have to wait till later to do a 1000 yd test. Our club does mostly 600 yd non-summer and 1000 yd summer as the firing line for 1000 yd is covered but 600 yd isn't .
I normally do five, five shot groups with powder loads in 1% increments and shoot through a chrony to find best ES and avg velocity. I can do this with or without the tuner weight. Then, take the data and plot oj Excel and do a curve fit to 4th or 5th order polynomial to find minimum ES and its powder load. This with jamming the bullet. This test finds the longitudinal resonance which can be used to minimize variation in Velocity. Then, I do tuner tests with two shots with one bullet colored red and +2% above best load and one colored green and 2% low. I tune for minimum vert deviation. And, sometimes see positive comp and tune for a little.
These results above just happened to be to verify the powder load determined in QL! I lucked out with the A-TIP. Now I will tune the tuner and we will see.