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Need Help Problem Solving Reloads

This is a discussion on Need Help Problem Solving Reloads within the Ammunition forums, part of the M14 M1A Forum category; Your load doesn't seem that hot, here's a load I use in my Tikka T3. Bullet: Nosler 168 gr. Ballistic Tip Powder: IMR-4064 43.0 grs. ...


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Old January 11th, 2017, 06:56 PM   #31
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Your load doesn't seem that hot, here's a load I use in my Tikka T3.

Bullet: Nosler 168 gr. Ballistic Tip
Powder: IMR-4064 43.0 grs.
Primer: Winchester Large Rifle
Case: Lake City 67
LOAL: 2.815 (2.185 Base to Ogive with Stoney Point)

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Old January 11th, 2017, 06:59 PM   #32
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Sounds like you've got a build up in the neck/throat area thats causing it to not seal when it expands. Your fps is really minimal... what 55 fps difference? I would look at the throat/neck area very close. With 1300 rounds down the pipe, things may have changed, but i would look first at a build up. Just my .02.....

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Old January 11th, 2017, 09:59 PM   #33
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Well.... most of the others suggested what I am...

Use a good brush and clean the chamber. It sounds like you have everything else covered. Soot on the neck suggests the load isn't abnormally hot, I got the same thing on my IMR4064 loads.

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Old January 12th, 2017, 07:41 AM   #34
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I wouldn't worry about having a little soot on the outside of the neck.

If the soot reaches back onto the shoulder area of the case, it's time to increase the powder charge slightly.

I think a brass/bronze brush is adequate for cleaning. I don't have experience with SS ones.

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Old January 12th, 2017, 07:57 AM   #35
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It has to be your reloads, pressure signs from Factory Loads are not all that uncommon, for example: Flattened Primers, I have seen this with Federal Loads in both my bolt and semi-auto guns.

Do you measure each powder load individually? What kind of press are you using?

I had a similar problem when I was using a Lee Turret Press. It was flexing, unbeknownst to me due to a base pin that was backing out, which meant that the shoulder was not always set back properly and that the rounds were not concentric. When I went back to to my RCBS press, the problems went away.

HTH.

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Old January 12th, 2017, 08:16 AM   #36
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Originally Posted by joesig View Post
How clean is your chamber?
My thought as well. I have the same issues with a M700 unless I REALLY swab all the oil from the chamber after cleaning and before firing. Otherwise, reloads, even at the starting charges will show high pressure signs for the 1st few rounds fired. Never had this issue before until I got this 700.

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Old January 12th, 2017, 10:53 AM   #37
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Some info on carbon ring affecting the throat.
http://benchrest.com/showthread.php?82146-Carbon-Ring

Cut and pasted from Criterion Barrels Re: Cleaning

"The Chamber

Proper cleaning of the chamber is a critical component of a general cleaning procedure. Carbon rings can build up near the neck and throat of the chamber wall, leading to feeding malfunctions and pressure spikes inside the chamber."
http://criterionbarrels.com/criterio...ing-procedures

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Old January 12th, 2017, 02:31 PM   #38
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I've got supplies on the way to clean up the throat area. I feel confident this will remedy the issue.

I'm going to try trimming cases to 2.010 to see if this will help alleviate the issue going forward.

I'm also going to take a look at the next higher node to see if it helps the case neck to get a better seal. I want the load to be safe in my M1A as well. What would be the upper limit as far as port pressure is concerned with a stock gas plug? I've read 43gr of IMR4064. Does this sound correct? While working up a load when the barrel was fresh, I loaded to 45.5gr without issue.

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Old January 12th, 2017, 03:14 PM   #39
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You could have buildup in the chamber causing pressure spikes but I would have to see it for myself. Not sure what you mean by 2.010" trimming because that is a bit long already, mine are usually 2.0" or 1.995" and then 3-4 firings before they grow enough to trim again.

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Old January 14th, 2017, 03:15 PM   #40
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Just a quick update. I cleaned the chamber area with my .375 bore brush. Some flakes of carbon came out and now my bore guide slides in like grease on glass. I'd call that a clue. I'll live fire test it tomorrow or Monday.

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Old January 14th, 2017, 03:49 PM   #41
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Quote:
Originally Posted by noob14s View Post
You could have buildup in the chamber causing pressure spikes but I would have to see it for myself. Not sure what you mean by 2.010" trimming because that is a bit long already, mine are usually 2.0" or 1.995" and then 3-4 firings before they grow enough to trim again.
Min trim length is usually stated at 2.005 so 2.010 is good. I dont trim until they are over the max 2.015.

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Old January 16th, 2017, 02:24 PM   #42
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Fixed my problem. It was a brass concentricity issue. After speaking with a very knowledgeable fellow at the range, he made some suggestions.

My sizing die was pulling the necks off center. No issues now. I guess after firing and sizing multiple times, the tolerances stacked against me.

Thanks from charlie98
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