Best Form/technique When Shooting From Prone Position With Bipod

[markha 99]

Sorry for the delay, been working away.

 

To ensure that a bullet leaves the bore of a rifled barrel in a perfectly paralleled manner it is essential that the internal edge of the rifle bore at the muzzles is as sharp and as perfectly round as possible.

 

If there is any wear to this edge, say from either bad manufacturing process or damage from carrying the gun in the filed, or more so if the edge is dulled in some places from constant abrasion from bronze brush then the gasses that push the bullet along the bore will escape at different points around the muzzle and then upset the bullets base on its exit, this will then cause poor groups.

 

One of the first things that can be done to a rifle to improve accuracy is to have a barrel 're-crowned' to put that perfectly round sharp edge back on, usually with an 11 degree angle.

 

So its not so much as the bore snake/brush removes large amounts of metal from the barrel, its more that it dulls the crown in an uneven manner.

 

Hope that helps.

Mark

[richmcgin 32]

Fully agree that the crown needs to be kept in A1 condition, but iam still not convinced that a bronze brush or bore snake will erode a barrel to any degree that would cause a noticable effect on proformance. I think that over a long period there would be an effect but over the average life span of a barrel i think you are far more likely to shoot your barrel out Than wear it out with a bronze brush.

The Army issue a bronze brush in their cleaning kits now where as when we used the SLR it was 2x4 and oil in order to reduce wear and extend the life of the barrel. but you must bear in mind that millitry rifles are cleaned daily and see far more abuse that a hunters rifle. They are of the opinion that the wear from a bronze brush is minimal even when used daily.

[kenj 131]

Two points not mentioned here are:1 Are you using the standard trigger set up in your CZ 452? My groups improved with the lightweight trigger mod. 2: The 452 is known for it's offset machining of the stock, often touching the barrel, any expansion of the barrel causing the floating barrel to be pushed to one side. Even a few thou can be magnified at 200 yards. This was the case on my Varmint 16 inch heavy barrel, which was easy to remedy with some emery paper on the offending woodwork.

I boresnake mine after every outing, usually not more than twenty shots and after several years, use have not noticed a drop in accuracy, in fact ammo can vary from box to box and give variable results, but that's another can of worms. My brass rod still bumps into the odd bit of muck in the barrel, a short lift and another drop usually all it needs. Check out http://www.urbanfieldsportsman.com/index.php/cz-452-varmint-17-hmr-rimfire/