baldhunter
Well-Known Member
71.0grs of IMR4350 with a 180gr Sierra BT shot well too.This was a 200yd group with those.
Rechamber to 300 prc?
Have you shot some Hornady 300wm précision hunters in that howa? Just to establish a base of what is potential.
The mono metal bullets like Barnes typically like a good deal of jump. Hammer bullets are advertised as being fairly jump insensitive.
I'd load what you have closer to the lands and single feed them before I handicapped accuracy. No guarantees that closer is better, but you need to try it.
Let me give you a couple of first steps to consider.
Have you tried factory match loads 4 groups of 5 at 100 yards. What is your average group size? What is your variation?
Do you have any hints of scope failure like flyers that you cannot call or difficulty making adjustments? You should be about to dial 1" left and move your group exactly 1" left.
What is your twist rate? What bullets have you tried? Have you tried Berger or Hornady? Specifically 180gr to 200gr.
Have you tuned your fl die to deliver consistent CBTD measurement and bolt close force?
With a given bullet, have you shot the full range of load data for given components?
Personally, I pick my bullet by use and twist rate.
Then I load 25 rounds at CBTO=lands-0.030" and vary the charge into 5 even groupings.
I think you guys need to re-read the OP. He clearly stated that he has an extremely long throat.
What you two are suggesting is that he convert his rifle to a single loader, cause if he does what you suggest, there is no way the cartridges will fit the magazine.
Let me give you a couple of first steps to consider.
Have you tried factory match loads 4 groups of 5 at 100 yards. What is your average group size? What is your variation?
Do you have any hints of scope failure like flyers that you cannot call or difficulty making adjustments? You should be about to dial 1" left and move your group exactly 1" left.
What is your twist rate? What bullets have you tried? Have you tried Berger or Hornady? Specifically 180gr to 200gr.
Have you tuned your fl die to deliver consistent CBTD measurement and bolt close force?
With a given bullet, have you shot the full range of load data for given components?
Personally, I pick my bullet by use and twist rate.
Then I load 25 rounds at CBTO=lands-0.030" and vary the charge into 5 even groupings.
Given all of this new info I think I'd do this. I'd check the crown, or have a trusted smith check it. If that looks okay I'd try a proven scope. If that doesn't change anything I'd try pressure bedding the fore end. That's what I would do because it looks like you've done the work trying different loads. I hope that helps.With the GMM I shot I think 3 groups of 5 the other five shots were used to establish zero. All groups were of similar size but I did not record them for statistical analysis.
I have tried mainly hornady and sierra bullets. 195 gr ELDs and and the 212 gr ELDx for hornady. Sierra I believe I tried some 180gr game king and a 165 gr game king I believe. All were between 1.5-2MOA. I dont have any Berger bullets in my stash as of yet was hoping to find something a little less pricey that had acceptable accuracy.
I have not noticed any scope issues. Scope has tracked very true with all adjustments and I have verified torque on all associated mount screws. The twist on the barrel is 1-10 as well.
I have not done full ladder testing on any bullet yet. Tried 2 loads of H1000 and 2 loads of 7828SSC for the 195 gr ELDs. In the past I try a few middle of the road test loads and find what seems to show signs of working and then ladder test from there. So far haven't found anything that's super impressive as of yet.
Reloading has been using once fired federal brass from this rifle, trimmed to length and only neck sizing.