Quote:
Originally Posted by 260 Rem
Interested to learn the practices/techniques employed by shooters that have competed at the National and International levels.
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Break in for our sbr barrels , this will be combined with fire forming the brass ( with bullets seated .050 long with light neck tension) for the barrel usually 22-25 pieces This brass will last the lifetime of the barrel in most cases and we operate way over the Sammi loads most of the time.
Shoot one , look in the bore with the bore scope If there is no copper just the grey colour from the carbon /graphite in the powder , keep going ( you are very lucky when this happens it is not the norm ) if there is copper present either in the lead throat area or at the muzzle end , clean
Using a good quality bore guide ,Push three wet patches through the the barrel pick them off the end do not pull the rod back to knock the patch off ( can cause crown damage if it jams ) , each one will normally be less black than the last , then soak the bronze brush with cleaner and work it back and forth, if your using a water base it will start to squeak ,when it squaks all the way from chamber to muzzle your done , usually about ten passes , take care not to push the brush much past the muzzle so as not to run the rod on the bottom of the crown ,
Now run a dry patch or two through the bore , have a look with the bore scope if all the copper is gone and the steal is clean run a patch down the barrel with eezox or lock eez on it and your ready to shoot the next one , if the is a blueish black colour on the steal st the chamber it must go , put a small dab of iosso on a SOFT nylon brush and short stroke (6-7”) the chamber end 6-10 times , now put a dry patch on and push it in the same distance ,now pull it back out through the bore guide , repeat this until a cleanish dry patch comes out , now wet a patch liberally with cleaner and push it through to get the rest of the residue , the idea here being not to push the iosso down the bore but to only work the affected area ,
Now look with the bore scope again , it should be clean again run a patch down it with eezox or lock eez ,
Shoot and repeat , at some point between 7-10 and 25 rounds the coppering should quit , I have seen some take as long as 100 rounds (aggravating ) ,
Even the best lapped barrels have some little “hairs “ along a land here and there , as well there are tiny striations that need to be magnified to be seen ,this and the reamer marks are what your “breaking in” , the reamer marks usually go away in 25 rounds or so ,
Things not to do , never use iosso and a stiff nylon brush , this is a good way to wreck a bore , never use iosso on a patch or a patch wrapped around the nylon brush all it will do is polish the lands and make the barrel a coppering fouling mess , jb’s Also works I told ,
If you;don’t clean the copper and the blue black scale out of a new barrel your just putting more copper over old copper and it will never get after the problem are under neath ,
The top guys can tell when a barrel is fouling up by the bullet holes in the target they can see it coming , that’s a whole other discussion
Cleaning , most shoot between 7-10 shots on a target ,then clean , most barrels will shoot 10-25 rounds before some sort of fouling starts to appear that will kill your agg , the trick is to be in front of it not clean it after it wrecks your day , like adjusting poa for the last shot, good way to wind up on page two .
I’m sure there is more that I have missed but see if this works for a start
Aftermarket Barrels - Break-in and Cleaning
Hybrid Mode
