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How many rounds can you shoot before accuracy fades?

 
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  #1  
Old 03-24-2014, 02:41 AM
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Join Date: Oct 2012
Location: western alaska
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How many rounds can you shoot before accuracy fades?

Well folks with my new 375 jdj barrel, it can hold good groups until the 7th or 8th round. Then it started to open up. I'm hoping as a few more rounds are run through it, it will start settling down.
I used re-15 48.0 gr's with sierra 250 gr slugs.
How many rounds can you shoot before you see accuracy fade?
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  #2  
Old 03-24-2014, 06:53 AM
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Re: How many rounds can you shoot before accuracy fades?

Each individual barrel is a different critter so round count will be different. Are you talking about total round count down the barrel or shots fired in a string?
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Old 03-24-2014, 08:16 AM
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Re: How many rounds can you shoot before accuracy fades?

This is a loaded question, to many variables to give a true estimate. On the other hand a 375 bore using <50grns of RL15 should last a couple thousand rounds more than a 308win, and the 308 can go 3K to 8K rounds depending on the barrel and how its treated. So theorectically you could get 10K rounds with the right barrel and treatment. On the other hand if you're talking about a shot string, sounds about like 7 or 8 rnds has heated it to the point that its starting to walk, not really much you can do about it.
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Old 03-24-2014, 11:38 PM
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Re: How many rounds can you shoot before accuracy fades?

Just firing strings in a day. Not the total life cycle of the barrel. Also, these are virgin brass. I won't use any fire formed ones till I'm done with the new cases. Time at the range is useful information if you pay attention to what the accuracy is doing from a clean bore to where things walk around. I think I'll be punching 10 rd strings in a day when i take it out then clean out the crud till my virgin cases are fire formed.
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Old 03-25-2014, 07:21 AM
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Re: How many rounds can you shoot before accuracy fades?

If you are shooting 10 shot strings without letting the barrel cool between shots your groups will open up because of the heat in the barrel not because of fouling. I would shoot no more than 5 shots and let the barrel completely cool down then shoot again and see what your accuracy is.
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Old 03-25-2014, 10:18 AM
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Re: How many rounds can you shoot before accuracy fades?

My rifles fade with heat too. I actually started bringing a small electric fan with me to the range to put air on the gun between rounds. I found a way to get the barrel pointed directly at the fan and with the bolt removed, it is completely cool in 5 minutes or so in 80 degree weather.

I have a Ruger 10/22 that I built 12 years ago. Everything is Volquartsen except for the bolt assembly and receiver. The carbon fiber wrapped barrel never gets hot, accuracy drops after10-15 shots. I can shoot .25-.30 groups at 50 yards with quality ammo on a clean barrel. At about 15 rounds, the group open up to .4 or so, then .5. Just a quick brush through the barrel and powder solvent and it back to tight groups.
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  #7  
Old 03-26-2014, 01:45 AM
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Re: How many rounds can you shoot before accuracy fades?

I will reduce the number of shots in a string after I have fire formed the new cases. I will clean out the bore after each session and take note how the groupings hold together during each outting. I have a few cans of gunslick foam boar cleaner that I can use to eliminate most if not all copper fowling. The first time I used it in the 375 jdj barrel, the foam was squirting out from the breach. It got pretty messy. But, I do have a casing that I crushed when I was first adjusting my die to form the 375 from its parent 444 marlin case. I can drill a hole thru the base where the primer seats into so the tube from the boar cleaner fits snug and cut the top half off the cartridge and toss it away. Now, mind you that I'm not reccomending anyone attempt this procedure. If any of you are familiar with the Thompson center, you know it's a break open action where you can remove the barrel completely and I presume that this modified case will work for which it is intended in my bore cleaning efforts.
That being said, I will also increase the time between shots to minimize the heat distortion. Elimination of many variables which can give false accuracy tests is the goal in the production of a quality load.
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