Group Evaluation :) lol

[ja4wheel6]

It’s like reading tea leaves and maybe it’s the gun, lol…

But, when you changed to bipod in the dirt, your last group centered on the target for a solid group and more random distribution.

It’s the other four groups that make me think the gun will shoot, because if you eliminate the “cold bore shot” your “settled in” groups are very good.

There are definitely patterns that seem to point to you are the shooter and control over the rifle.

If you aren’t totally comfortable behind the gun, and using the “molinator” which is a lightweight springy rear bag, then your groups are excellent.

Don’t discount the brutality of a 300 magnum in a hunting rifle. There is a reason bench rest guns are heavy and shot over heavy front and rear bags for consistent recoil.

Check out how and why @Broz of Long Range Only designed and sells the Hunter’s Wedge for big magnums. My company sews the bags for him, and I learned a lot about controlling the big magnums for precision in a hunting rifle.

You are on the right track with getting the rifle set up for you.

Love to hear about your progress and experience.

Alright, another photo same gun. Except I didn't have a rail yet, so i took a bog pod and pinched the gun in as hard as i could right at the mag well. and dropped it all the way down into prone and through a sand bag under the rear.


The gun was completely deep cleaned prior to this as i was in the barrel break in process.

 

[Macintosh]

Assuming those are 1” squares and shot at 100 yards, according to my little magic phone app ballistic-x your 5 groups measure:
1.02moa
1.21moa
1.79moa
0.96moa
1.18moa
Average: 1.23moa

What is the accuracy guarantee? You do have a 4-shot sub-moa group. Assuming they guarantee “3-shot moa guarantee”, the gun DOES meet that spec as-is. The guarantees never, ever say “every time”.

 

[wind gypsy]

Vortex rings, pros i think? Zeiss conquest v4 4-16 x50
I have unknown munitions premier rings in hand and nx8 is en route

I sent my last mpr back 4 times until they just gave me this rifle. It shoots better than any of the last 4 times i sent them back. Now i am trying to pull the best accuracy i can out of it. I should of sold it when it was brand new and just built a custom. I will take this one to a gunsmith if i cant get it to shoot and have them true it up.

Holy cats, 4 times?! What model is this one?

There were a number of posts on the hide a while back about a lot of Christensens walking as a group was shot. Mostly MPRs. Your 5 groups point towards that as a possibility.

 

[MallardSX2]

I guess I’m the only one who thinks that it’s grouping pretty good. Lol

 

[ja4wheel6]

Holy cats, 4 times?! What model is this one?

There were a number of posts on the hide a while back about a lot of Christensens walking as a group was shot. Mostly MPRs. Your 5 groups point towards that as a possibility.

This is the ELR they exchanged mine for after the 4th time. Very happy with customer service on that point. They at least tried. I think I finally have a “good one”. Now I just gotta tweak it to its best. 300prc In a carbon setup is not super easy to recoil manage i am learning. Going to try the supressor tomorrow to see if it “tames it down some”

But yeah the heat walking, my last barrel on the MPR had it bad. 4-5 moa shift by round 4-5 of a group. Sucks because it consistently shot .5 moa or better cold bore. Let 4-5 min between each shot and it hammered. Shoot two In a row and got 2moa shift.

 

[wind gypsy]

This is the ELR they exchanged mine for after the 4th time. Very happy with customer service on that point. They at least tried. I think I finally have a “good one”. Now I just gotta tweak it to its best. 300prc In a carbon setup is not super easy to recoil manage i am learning. Going to try the supressor tomorrow to see if it “tames it down some”

But yeah the heat walking, my last barrel on the MPR had it bad. 4-5 moa shift by round 4-5 of a group. Sucks because it consistently shot .5 moa or better cold bore. Let 4-5 min between each shot and it hammered. Shoot two In a row and got 2moa shift.

That is baffling that they would send 3 different replacements out without verifying they work correctly.

At least that ELR isn't crazy light, shouldn't be terribly hard to shoot decent and that stock seems to be more solid than some of their other offerings. Good luck.

 

[wind gypsy]

I guess I’m the only one who thinks that it’s grouping pretty good. Lol

Yeah, i wouldn't call em bad. Just looks like there's something going on that could make it better.

 

[ja4wheel6]

Update. I took a paddle wheel sander to the the forend to free float the barrel more. Found out I was getting some contact. Helped with the flyers, but groups were still bigger. I added a 9.5” arca rail to the forend, think it stiffened it. Not sure if that helped but needed it anyways. I then bedded the action. Installed my new UM rings. And she’s finally a shooter!! First two shots were taken. I did 3 clicks down (moa scope) and 1 click left. Next 4 shots were the result.

 

[hereinaz]

Sometimes there is hope for a rifle!!

In one of the threads around here, they measure the barrel channel float by number of cats... I have always liked a big gap that I look down into and see plenty of daylight.

 

[mxgsfmdpx]

Chances are you lost Christensen arms roulette.

Don’t dump more money into a Christensen arms. Probably a junk barrel. I played this game and it was a huge waste of time and money.

This.

 

[Shortschaf]

Update. I took a paddle wheel sander to the the forend to free float the barrel more. Found out I was getting some contact. Helped with the flyers, but groups were still bigger. I added a 9.5” arca rail to the forend, think it stiffened it. Not sure if that helped but needed it anyways. I then bedded the action. Installed my new UM rings. And she’s finally a shooter!! First two shots were taken. I did 3 clicks down (moa scope) and 1 click left. Next 4 shots were the result.

NICE JOB OP!

This thread is now a great example to use anytime "accurizing" comes up

You did more by fixing a poor stock setup (maybe remounting the scope helped too) than many reloaders do in a hundred rounds of load development

 

[TaperPin]

Good job tracking down the issue.

If it happens on another new rifle and you don’t want to alter the stock quite yet, there’s a simple old trick that will point out poor bedding. Cut a couple strips of cardboard out of a cereal box and put between the stock at the front and rear action screws where the action contacts the stock. This creates more side to side pressure and lifts the action and barrel farther off the stock. If a rifle has sloppy bedding, this will show instant results and can be done at the rifle range. I keep a little cardboard in my range bag just for this.

If the cardboard shows a big improvement, then I’ll bed the stock. If it shows no change then I’ll still bed one of my rifles, but the new bedding won’t change anything.

 

[ja4wheel6]

Another update. Little hillbilly but think I got it figured out.