- Dec 6, 2016
Looking forward to hearing follow up from this.
Sure have. I use to pressure out at about 3150 at 87 grains. 85.7-86.4 was 3100 +- 7 FPS. Now I have .7 grains and covers 3045. And pressure out at 3100. Man I really hope this barrel didn’t go south at 400 rounds. I would shoot 3-4 rounds and let it cool tell it was just a little warm. All shooting was done 60 degrees or less so the barrel cooled pretty fast. I need to find someone with a bore scope that lives in western wa.
Typically when breaking in a new barrel this exercise is a shoot and clean process that helps smooth the lands and grooves to reduce friction and ultimately reduce copper fouling. If this process is done correctly using the proper solvents/barrel polish, it usually takes between 25 and 50 rounds depending on the quality of the barrel. If you start off with a quality barrel that was honed prior to installation, normally you don't have much of a "break in" period. If the throat has 0.009" erosion, seating the bullet out a little further will take care of this issue and is a simple fix. With respect to the slower velocity, I would try cleaning the barrel with Bore Tech Eliminator and/or KG-12 copper removal and never use a brush just the properly fitted jag. If you have a small area in your barrel that is peeling a little jacket material off the bullet, you could be loosing pressure as a result of the removal of jacket material and getting some gas blow by between the bullet & the rifling. However, this usually effects accuracy to some varying degree from small changes in group size to significant differences in group size depending on the degree of the fouling area. Also, check your powder as some powders can change from lot to lot. Best advise is to thoroughly clean the barrel will copper solvent and a jag no brushes and reduce the amount of rounds through the barrel between cleaning. See if that helps.I have about 400 rounds down a 30/28 nosler and the accuracy node has slowed down about 60 FPS. I use to run 3100 all day long. Suddenly she dropped off. When barrels slow down does this usually mean there close to being done?