About 12 years ago, I used some winchester supreme ammo in my 7mm Rem Mag. they were the nickle plated shells with a black coated bullet. I fired about 12 rounds without cleaning the barrel and had to leave it a day or two.
When I did clean, I looked thorough the barrel and noticed that the rifling grooves were plugged about 6 inches back from the muzzle. Took about 20 minutes with a brass brush to get it cleaned .
About a year later, I saw the exact same thing happen to a 270.
Both rifles were win model 70.
Has anyone else experienced anythng like this?
When I did clean, I looked thorough the barrel and noticed that the rifling grooves were plugged about 6 inches back from the muzzle. Took about 20 minutes with a brass brush to get it cleaned .
About a year later, I saw the exact same thing happen to a 270.
Both rifles were win model 70.
Has anyone else experienced anythng like this?