All my load development was for nothing.

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I was like that's a weird carbon deposit. After cleaning it, I realized it wasn't carbon.
It was an Anderson AM15. I don't know who their barrel maker is. I just repaired it and moved on. Since I didn't give them the opportunity to repair it, this thread isn't to complain.

I wasn't looking to place blame either. It's odd that the crown was that bad and it passed a quick visual, and with a manufacturer like Anderson that sells a lot of rifles seems odd. Barrel seems to just skipped the crowning process in the assembly line.

This is a big part of the reason I really like assembling my own AR's, I can inspect every part through the whole process.
 
It's odd that the crown was that bad and it passed a quick visual, and with a manufacturer like Anderson that sells a lot of rifles seems odd. Barrel seems to just skipped the crowning process in the assembly line.
I agree. Crazy stuff happens.
Just over a year ago, I was at my FFL picking up a 'new in box' Ruger GP-100 in .22
I was doing my visual check and noticed there were no front or rear sights installed.
My FFL looked at it closely and said it appeared that they were never installed vs. once installed and then removed.
(In defense of Ruger, it took me quite a while to notice the sight's were missing.)

OP: I'm afraid I may already know the answer to this, but would you happen to have any pictures of the bad crown?
 
I agree. Crazy stuff happens.
Just over a year ago, I was at my FFL picking up a 'new in box' Ruger GP-100 in .22
I was doing my visual check and noticed there were no front or rear sights installed.
My FFL looked at it closely and said it appeared that they were never installed vs. once installed and then removed.
(In defense of Ruger, it took me quite a while to notice the sight's were missing.)

OP: I'm afraid I may already know the answer to this, but would you happen to have any pictures of the bad crown?
To be a fly on the wall for that interaction. It would have been funniest if it was a used gun that you were looking at.
Sadly, I'm not used to logging my work with pictures.
It had a radius and crown. But there were even grooves that went about half the depth of the crown. These were perpendicular to the muzzle.
p_080947211_1.jpg
My guess is something like this is what caused it.
If it's an automated system, it may have been faced, crowned, threaded, and polished before anyone saw it. It was easy for me to notice because the carbon deposits were uneven. They would have been looking at shiny steel.
 
Yeah for a while ALL the AR manufacturers were running flat out. Mistakes happen and I will be the first one to end up with a mistake LOL. At least you got it figured out. I would load up a few with your good load and see. You might be surprised. ;) FWIW I have had good luck with those Hornaday 55 grain SP bullets for 200 YD work on critters with minimum pelt damage with a medium load of TAC.

Have an older buddy that ran a trap line for years and one day his fur buyer asked how the pelts had no bullet holes in them ever. He smiled and said "I just waits for them to open their mouth and aim for thar brain".:D
 
Yeah for a while ALL the AR manufacturers were running flat out. Mistakes happen and I will be the first one to end up with a mistake LOL. At least you got it figured out. I would load up a few with your good load and see. You might be surprised. ;) FWIW I have had good luck with those Hornaday 55 grain SP bullets for 200 YD work on critters with minimum pelt damage with a medium load of TAC.

Have an older buddy that ran a trap line for years and one day his fur buyer asked how the pelts had no bullet holes in them ever. He smiled and said "I just waits for them to open their mouth and aim for thar brain".:D
Both loads use powder that is tedious to get in the case.
One is 23.8 of 4064 and the other is 26.8 of 3031.
 
I got a chance to try 2 of my old loads tonight.
Load one was a 40gr over imr3031. It was terrible.
I then shoot my 55sp over 4895 and it was in the 2-3 moa range.
I took the blast can off and replaced it with the birdcage and my 55sp load shrunk to just over one inch.
I then shot the 55gr Aguila and it was under 1.5 inches instead of 2.
The funny thing is the Hornady black 75gr and Federal 40gr shoot better with the blast can.
As I get time, I'm going to focus on load development using the blast can since it makes it possible for me to shoot without waking my baby.
The birdcage bounces off my covered porch. The can pushes it away from the house.
 
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