Hi Finewine,
I have use the bbl break in as proscribed by Ed Brown on several rifles from him and other makers. Can't say for sure that it makes all the difference in the world, but the guns certainly shoot well, and you get a good day or two at the range....in the case of my .338's and .340's it was several days.
From Ed Browns Website
http://www.edbrown.com/adobe.pdf/riflemanual.pdf
Summary of Rifle Barrel Break-in Instructions
1. Fire one round and clean. Do this ten times. 10 rounds fired. (We have already done this step for you during initial testing)
2. Fire three or four rounds and clean. Do this five times. 25-30 total. Many clients like to fire one round to foul the bore, then shoot a group
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of three while developing loads. Then clean and repeat.
3. Fire five or six rounds and clean. Do this five times. 25-30 rounds fired this step. At least 50 total. This step does not have to be done the
first day. In fact, it may be done over a period of months. A good idea here is to shoot a fouler round, then shoot two groups of three.
The important idea here is to just clean a new barrel frequently, until it gets about 50 rounds through it. If you do, then you will have the most
accuracy that particular barrel is capable of, and a barrel that will foul less, and last longer.
Complete Barrel Break-in Instructions
Proper barrel break-in and cleaning habits have more than a lot to do with the ultimate accuracy the gun is capable of. Barrel break-in is
absolutely essential to the ultimate accuracy the gun is capable of.
Make certain the barrel is clean and free of oil by pushing a clean patch through. Then head out to the range with the new gun, some quality
ammo, the cleaning rod, plenty of patches, and a bottle of bore solvent. I happen to like Barnes CR-10, it works quickly and does a great job.
A cleaning rag is will come in handy, as will a gun rack like the one MTM makes.
Don’t use junk ammo. Use the good stuff because you can immediately begin developing loads, or finding the best factory ammo for your
gun. All barrels are different, and only by trying different loads will you learn which your barrel likes best.
Shoot one round through and one round only. Then clean the barrel. My favorite procedure is to run the rod through the barrel from the
breech, and let the jag just stick out from the muzzle.
I like the Dewey stainless steel rods and the wrap around type Parker Hale brass jags. Dewey and Pro-Shot both make good rods. The Dewey
plastic coated rods are nice too. I don’t recommend the brass or aluminum rods for other than occasional cleaning. This is heavy duty
cleaning, so use a heat treated stainless steel rod, with a swivel handle. If you really want to be professional, use a bore guide to keep the rod
completely away from the rifling just ahead of the chamber.
Wrap a patch around the jag sticking out of the muzzle, saturate with solvent, and PULL it back through, but don’t let it come completely out
the chamber. Then stroke it back and fourth several times. The purpose here is to merely wet the bore with the solvent and remove some of
the powder fouling that is covering up the copper fouling.
Then push the jag back out the muzzle and you will likely see that it is black with powder fouling. Now change patches, and saturate the new
one with fresh bore solvent. Now stroke this new patch several times and your new inspection will probably find that the patch is blue
showing that it has chemically melted the copper fouling present from only one bullet.
Next, repeat this step with a fresh patch and solvent, and keep repeating this routine until the patch doesn’t show any blue or black color.
Then run one more dry patch through to prepare the bore for the second shot. Fire a second shot and repeat the cleaning procedure. This cycle
should be repeated for ten rounds. That’s right. Fire only one shot and clean, and do this ten times.
WE HAVE ALREADY FIRED THE FIRST 10 ROUNDS FOR YOU DURING OUR ROUTINE TEST FIRING AND
INSPECTION.
The next step is to fire three rounds and clean again, and repeat this cycle five times until you have used up fifteen rounds. Total rounds fired
now is twenty five. MANY BARRELS ARE READY TO GO AT THIS POINT. Exercise care, and clean after every five rounds for the next
25 rounds or so, but this can be done during the life of the gun. NO NEED TO SHOOT ALL THESE THE FIRST DAY - JUST CLEAN
FREQUENTLY UNTIL THE BARREL HAS AT LEAST 50 ROUNDS THROUGH IT.
BLUE BARRELS WILL RUST IF LEFT UNPROTECTED. PROTECT THE BORE WITH A LIGHT FILM OF HOPPES 9
SOLVENT OR A LIGHT OIL PRIOR TO STORAGE.
About bronze brushes. Most high performance copper removing solvents will quickly eat up bronze brushes too. One could use nylon brushes
to eliminate this problem, but I don’t use brushes at all, preferring instead to stick to patches and chemically remove the copper fouling.
About solvents. My personal favorite is Barnes CR-10 because it’s so fast. I also use Hoppe’s Bench Rest and Hoppe’s 9 for storage.
NEVER MIX SOLVENTS! You can get into real trouble here. For instance, a mixture of Barnes CR10 and Shooters Choice Copper
Remover could etch a bore in less than ten minutes! Either one used by itself is safe for all bores, but mixed together, they can ruin a barrel.
Any high performance copper remover will destroy the rust preventative qualities of any oil you might have in the bore. Always follow up a
cleaning procedure with oil prior to gun storage. I even oil my stainless steel barrels. For storage, I use Hoppe’s 9. It contains kerosene, so
protects against rust like oil. Another bonus, it will slowly eat away copper, leaving a green residue which will be apparent the next time you
run a clean patch through the bore.
Don’t worry about barrel life. A quality barrel well cared for will deliver top accuracy for several thousand rounds if chambered for a mild
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cartridge like a 308 or 30/06. Of course very hot cartridges like the 7mm STW will show throat erosion in as little as 250 rounds, but the gun
will still provide more than adequate hunting accuracy. Replacing the barrel on your rifle is one of the least expensive, and easiest
accomplished jobs we do.
I have found that in well cared for barrels, the accuracy keeps getting better up to 100 to 200 rounds or more. Then it will stay for a
considerable number of rounds in the milder calibers, and then very slowly degrade with throat erosion. This happens much sooner with the
very large capacity cartridges. The exact number of rounds is impossible to predict with all the variables present. Obviously, the more powder
one burns in a barrel, and the hotter it gets, the sooner it will erode. Keep your barrels clean and cool for longest life.
Good luck,
Steve