Hoppe’s No. 9 Bore Solvent – Item of the Day — 3 Comments

  1. Hoppe’s Benchrest does a good job for the copper fowling.

    NOTE: the following comment only applies to center fire rifles using only copper jacketed bullets with non corrosive primers and powders. .22’s, handguns, AK’s shooting Russian ammo, black powder etc. should regularly have the bores cleaned.

    There are two schools of thought when it comes to cleaning the bore of a rifle. The benchrest guys and most of the general public tend to clean their bores regularly and maybe fire a couple fowling shots. The other group looks to clean their bores only when the copper buildup has gotten to a point that it is affecting velocity erratically. This happens when you are passing the upper end of copper equilibrium where the projectile is no longer scrubbing as much copper out of the bore as it is leaving. Most shooters will never see the difference in the two methods but over cleaning your bore will have a detrimental effect to barrel life, especially throat erosion, and extreme long range accuracy where small changes in velocity have large impacts on trajectory. For a very in depth explanation see: through part 45

  2. Something that probably isn’t as big a deal as it used to be is that Hoppe’s was designed for corrosive ammo. There used to be people who made a big point that if your where shooting corrosive ammo you need WW2 era bore cleaner to clean the corrosive fouling but the truth is that Hoppe’s was formulated long before there was non-corrosive ammo and the formula was never changed. As I said, not as big a deal today as few people are shooting old military ammo but if you do don’t worry about needing special cleaner, Hoppe’s works great.