Ok here's what I figured out.
1st, I need to get a bore scope even if it is a cheap 1.
2nd, I believe carbon was a contributing factor.
We ran a 270 caliber bronze brush with losso followed with some patches. This pulled 50-60% of carbon out.
Then ran some Mothers mag wheel polish on the 270 brush this pulled another 25% of the carbon.
1st, I need to get a bore scope even if it is a cheap 1.
2nd, I believe carbon was a contributing factor.
We ran a 270 caliber bronze brush with losso followed with some patches. This pulled 50-60% of carbon out.
Then ran some Mothers mag wheel polish on the 270 brush this pulled another 25% of the carbon.