Hello.
I have a heavy barreled Mauser M67, 308W (7,62 NATO chamber) that I recently shot groups at C/C 3mm. (3 shot at 100m.). When i got home I cleaned the new barrel with "Forrest(?)" foam, to remove the kopper.
I use the original NATO loads, but change the bullet to 150grs. Sierra Match King's.
The next weekend i tryed it again and now it shoots 3 shot at approx. 40-50mm c/c????? With the exact same cartridges!! I've spoke to some people that said that after cleaning a barrel with that stuff, they have to shoot some 40-60 shots before the retain the accuracy. Does anybody else have any experience with this???

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Shoot well, and hit hard.

Arild.

I give up...What the heck is forest foam?
Sounds like a product for the ladies to shave their legs with.
Jim

Looks like it to.
I'ts some foreign shit thats supposed to remowe copper from the barrel. But it sounds like you're not the man to help me!!

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Shoot well, and hit hard.

Arild.

"Butches bore shine" is the product to use to clean your barrel.To get a good idea of what your rifle is doing it would be better to shoot a 5 shot group! Good luck

460wby - Difficult to diagnose but could well be a fouling problem, but it could also be a scope problem. How many rounds did you fire originally? What other solvents can you lay your hands on in your country? I would suggest that you find a better copper solvent and use a high quality brush with patches. Make sure you use proper cleaning tools if you can obtain them.

If you have another scope, you may want to swap them. Also check all your screws to make sure everything is tight. The best thing to do at this point is go back to the range and shoot. If you are unsure of your rest, you may wish to have a friend shoot a group or two. This will eliminate shooter induced errors.

Let us know what you find.

I use Forrest Foam regularly (BTW, not so foreign for you, considering your location...) and it works very well to remove copper. The reason I don't use it more is that it's quite expensive. Removing copper from a barrel or just deep-cleaning it, may require a few shots to recondition the bore -in some rifles- but not to the extent you describe. Therefore, I'll second Zero Drift in advising your checking rifle/scope parameters.

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Andr�

When you changed the bullets, you also changed to load yo something totally different. You may be shootin the same bullet weight but it really doesn't work that way. I understand your posting to mean that the only thing you did was to bull the military bullets and to seat new bullet. I have a few questions. Did you rezie the casein any manner? Did you remove the original sealant that was on the bullet and the inside of the neck? Were the two makes of bullets the same weight? It seems to me government bullets are 147 grains. Were they both of a boattail design? Even if they were there will be a difference in bullet bearing surface that will effect pressures. Doing as you did sound like a good idea, but it seldom works well in execution. I tried the same thing years ago with GI national match .30-06 ammo. It didn't work for me either. U.S. manufactured brass is pretty good brass. It is worth the effort it takes to pull and discard bullets, the powder is pretty good for plants, deprime and decrimp primer pockets. I'd suggest you cull brass by make and year of manufacture. I hope that this is of some small help. Welecome to the U.S., even if it's only on the site.

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BigBob

Hello bigbob.
The problem is'nt if this combination works or not, I know it does. It's common to do this, and I've done it a lot. With success to!! And I know that I have to be carefull to have the same LOT (Serial no.).
The problem here is that this rifle was good enought for any "benchrest-match" the one weekend. And spread the bullets like a shotgun the next weekend, using the exact same cartridges. It is the same loads. I loaded approx. 50pcs, and had 20 left, so it can't be the reloading operation it self thats the problem. And I havent touched anything else on the rifle. Brought it to the range, and home lying in a rifle-case. So nothing can have happend to it.
It occures to me that this barrel maybe not have been "breaken in"??? I bought this rifle, used. And the man told me the barrel was quite new, and maybe it is brand new. So I only have to shoot and clean, shoot and clean........?
(Sorry about my last answer, I was not in a "funny-mood" right then!!)

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Shoot well, and hit hard.

Arild.

[This message has been edited by 460wby (edited 01-30-2002).]

Leaving aside crown damage from cleaning how about the bedding settling and hence the action screws might require re tightening?

Other than that shoot the same number of round throught it that it had had before to get the same level of copper in the barrel. You might have to check with the ex owner how many he put through it. He might have never used a real copper solvent and it might have liked it!