What am I looking at here?...

[mattm0812]

I was a little curious about you firing it a few more times--I was going to suggest that you try a quality factory load to see if the same blemishes are happening, in which case something may be wrong with the barrel/rifle. If not, I would suspect something in your home-brew.

He won't take the time to fire it a few more times when he has 10 other barrels waiting to be tried out...lol

[Gmac5]

The powder i was using was surplus ,cant remember the number ,but it was for the 223 (5.56) now that im thinking about it it may have been tin or aluminum added or both . Antway clean it now with JB or rem 40x .
There are 2 ways to clean a barrel ,chemically or abrasives .
Abrasives wont harm even the softest barrel steel .
Gary