I have this cross posted on the 65creedmoor forums and am trying to get as much input as possible before I sit down at the bench again in the next few days here. That po st can be found here: http://www.65creedmoor.com/index.php?topic=9701.0
I'm still having trouble finding a load that this barrel likes, I feel like I should be able to consistently get 0.5MOA or better out of it.
The first post I made with the load development for it can be found here:
http://www.65creedmoor.com/index.php?topic=9424.msg100795#msg100795
The excel spread sheet with groupings taken after 5.11.18 can be found here:
https://docs.google.com/spreadsheets/d/1Y7GXfurnYqparltGcvGzbtlSHVQCAoQjy03_NYcJvs8/edit?usp=sharing
Since the first posting I made some additions to my reloading bench:
K&M VLD neck reamer: I noticed some copper dust around the inside of the neck where it met the bullet after seating ad the seating felt "stagey."
A&D FX-120i to rule out any powder variances from the RCBS charge master
Sinclair runout gauge - found the original rounds had anywhere from 1-2.5 thou R/O(runout) at neck and 2.5-5 thou R/O at ogive
K&M 0.0015 & 0.002 expanding mandrels - I found the neck run out seemed to be induced by the neck tension sizing process using a Redding bushing die. Now I currently use the bushing dies followed by these which seem to help(Should I just get a non bushing resizing die here now to further reduce runout?)
K&M Arbor press & Wilson inline die in attempt to reduce runout and seat consistently.
I was able to half the run out at the necks and ogive by half in most instances.
A member suggested I play with the seating depth a bit and during that loading session is when I noticed the copper jacket powder from the 45degree chamfer. I stopped half way through that loading session with only one increment up and went out and shot what I had loaded down the road.
The last session in the excel spreadsheets is with some berger Hybrids I was able to chase down and a 4 string shot from batch of 140gr eld-m over 42gr loaded with all the new toys. Out of about 25 loaded I got the following runout: 18 had less than 0.0015, 5 at 0.003, the rest between 0.004 and 0.005.
I'm shooting off a cadwell rock and have a nice protektor rear bag, gun recoils straight back and glides in the bag with ease.
I feel as if I am definitely getting back on the gun consistently between shots(I would just sit there and dry fire and practice doing so with each 2-4 hour range session), and have been giving the barrel 5-8 minutes to come back down to near ambient temp with a chamber chiller in the action.
The single digit ES/STD for some powder increments do not seem to always coincide with tight groups here so I find it hard to believe the fliers are me.
With all the data in the excel sheet here I am wonder what the nodes are and what I should try exploring with seating depth for the ELD-Ms and Bergers.
For the bergers 42.0 and 42.4 seem really promising and the 42.0gr group shot from the ELD-M batch with low runout seems good as well. Am I on the right track here and can anyone give any more insight?
Edit: it has been brought to my attention the embedded group pictures are not rendering for everyone, thr attached pdf should clear that up(or downloading and opening the file from Google drive).
I'm still having trouble finding a load that this barrel likes, I feel like I should be able to consistently get 0.5MOA or better out of it.
The first post I made with the load development for it can be found here:
http://www.65creedmoor.com/index.php?topic=9424.msg100795#msg100795
The excel spread sheet with groupings taken after 5.11.18 can be found here:
https://docs.google.com/spreadsheets/d/1Y7GXfurnYqparltGcvGzbtlSHVQCAoQjy03_NYcJvs8/edit?usp=sharing
Since the first posting I made some additions to my reloading bench:
K&M VLD neck reamer: I noticed some copper dust around the inside of the neck where it met the bullet after seating ad the seating felt "stagey."
A&D FX-120i to rule out any powder variances from the RCBS charge master
Sinclair runout gauge - found the original rounds had anywhere from 1-2.5 thou R/O(runout) at neck and 2.5-5 thou R/O at ogive
K&M 0.0015 & 0.002 expanding mandrels - I found the neck run out seemed to be induced by the neck tension sizing process using a Redding bushing die. Now I currently use the bushing dies followed by these which seem to help(Should I just get a non bushing resizing die here now to further reduce runout?)
K&M Arbor press & Wilson inline die in attempt to reduce runout and seat consistently.
I was able to half the run out at the necks and ogive by half in most instances.
A member suggested I play with the seating depth a bit and during that loading session is when I noticed the copper jacket powder from the 45degree chamfer. I stopped half way through that loading session with only one increment up and went out and shot what I had loaded down the road.
The last session in the excel spreadsheets is with some berger Hybrids I was able to chase down and a 4 string shot from batch of 140gr eld-m over 42gr loaded with all the new toys. Out of about 25 loaded I got the following runout: 18 had less than 0.0015, 5 at 0.003, the rest between 0.004 and 0.005.
I'm shooting off a cadwell rock and have a nice protektor rear bag, gun recoils straight back and glides in the bag with ease.
I feel as if I am definitely getting back on the gun consistently between shots(I would just sit there and dry fire and practice doing so with each 2-4 hour range session), and have been giving the barrel 5-8 minutes to come back down to near ambient temp with a chamber chiller in the action.
The single digit ES/STD for some powder increments do not seem to always coincide with tight groups here so I find it hard to believe the fliers are me.
With all the data in the excel sheet here I am wonder what the nodes are and what I should try exploring with seating depth for the ELD-Ms and Bergers.
For the bergers 42.0 and 42.4 seem really promising and the 42.0gr group shot from the ELD-M batch with low runout seems good as well. Am I on the right track here and can anyone give any more insight?
Edit: it has been brought to my attention the embedded group pictures are not rendering for everyone, thr attached pdf should clear that up(or downloading and opening the file from Google drive).
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