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Will Barrel Fouling Affect Dasher Accuracy?

6 Dasher barrel, about 8-900 rounds shoot in slow pace, using varget and Sellier & Bellot primer.

Chamber around the neck area
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Aound the throat area just before reaching the rifling
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Roughly 5-7inches towards muzzle
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About half way towards muzzle
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I clean the barrel every time after went to the range, most of time in the same day, only a few times I cleaned 2 days after.

I noticed some grouping issue this year, 5 shot group size increased from average 0.5 MOA to 1-1.5MOA without making any change to the load. Shot 700 rounds last year, then left the barrel after clean it before winter). And I used a bore scope taking some photos before I cleaned the barrel. Not sure if the grouping issue is related to how dirty the barrel is? (Checked action screws, barrel torque and scope mount)
 
This works really well!!
 
Use your favorite solvent and let it sit 30-60 minutes.

Twist a 30 caliber bronze brush about 10 full rotations in the neck area of the chamber to get that ring. Run one more wet patch than 3-5 patches of JB, short stroking each one the full length of the barrel, but especially in the throat. Don’t let them exit the muzzle. Duct tape over a patch works great.

Then, do another normal cleaning to get the JB out. If you’re using nylon brushes, throw them away and use bronze. Just don’t use bronze with JB on them.
 
Last edited:
This works really well!!
Indeed, I got a couple of them, after clean it, it is much better.
 
This works really well!!
Don't use this in conjunction with a bronze brush. It's got Iosso bore paste mixed in with it. Use them both together and damage to the barrel can result.

Later, Frank
Bartlein Barrels
 

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