Nosler Partition Copper fouling

[jsthntn247]

I have been shooting Bergers in my .243 with great accuracy. However 98% of my shots are less than 200 yards so I decided to try some partitions out. When trying to work up a load for them I noticed that the barrel was copper fouling extremely bad near the muzzle. So bad that by the end of load testing the gun was throwing bullets everywhere. I cleaned the gun thoroughly and loaded some up last night, and sure enough after 3 shots there was a large amount of copper in the bore and by 7 shots the gun was shooting all over. I could put 50 Bergers through the gun and couldn't see even a trace of copper. Does this sound right? Its a factory gun also.

 

[mr45man]

Had the same results with 180 nos, 30 cal in 300 wsm.
Went back to 210 bergers.
John H.

 

[jonbearman]

One thing that could help is to hbn coat your bullets.Sounds like your barrel has a small incremental choke in the end by or near the muzzle.What kind of gun is it,this may tell why the sierra jackets arent holding up.

 

[wapiti25]

He had a problem with Nosler Partition's not Sierra's jackets.

 

[GrocMax]

Noticed the same thing with PD loads in several calibers, Noslers shoot fine, good terminal performance, but copper up quicker, coated or not.

 

[jonbearman]

Sorry about that meant nosler but anyway,what kind of barrel is it,factory or aftermarket. I have shot a slew of noslers with no problems in 6.5mm and 30 cal.At that time I must admit I was lightly coating with moly but now I am moving on to hbn.