Cold lapping

[AJBert]

Not sure if this is the right forum but the question I have is does anyone have experience with cold lapping a brand new barrel on a rifle?


I have two brand spanking new, never fired Win Mod 70's, one in .25-06 and the other in .270. From what I've learned, lapping in a barrel, either cold or hot, will definitely make cleaning sessions much easier and MAY increase accuracy.


Although the cleaning part would be nice I am more interested in the accuracy area. Now, being as these have never been fired I can't compare the before and after.


Just curious if anyone on the board has any experience with lapping a rifle barrel and if you were happy with the results?

[kahrnut1]

I lapped a 1000yd douglas barrel on a mauser action many years ago. I could not tell accuracy change but it did make it much easier to clean. I bought a kit to lap it I think from brownells.

[muggsy]

Any accuracy improvement that you might see comes from the barrel fouling less. My Dad used to lap the barrels of the custom sporters that he built. I never saw a real need for it in a hunting rifle.

[Rbodine]

Cold lapping

What is cold lapping???


Sent from my iPad using Tapatalk

[340pd]

I just bought a Ruger American Rimfire. The first thing I did was run a couple of patches covered with JB bore cleaner about 50 times down the barrel.

Whether it works or not I do not know but it made me feel like I did something good.
First set of 30 rounds at 25 yd. with CCI mini mags was not too bad considering I laid the gun over a log, seated, and just pulled the trigger.

[100percent]

You could drive a soft lead ball through your barrel and push it through several more times with some fine polish on it.

I have fire lapped a 44 mag as it was tight at the breech and leaded badly just past the forcing cone.

[BEARDOG]

I just bought a Ruger American Rimfire. The first thing I did was run a couple of patches covered with JB bore cleaner about 50 times down the barrel.

Whether it works or not I do not know but it made me feel like I did something good.
First set of 30 rounds at 25 yd. with CCI mini mags was not too bad considering I laid the gun over a log, seated, and just pulled the trigger.

It looks like something is working just fine, good shooting!

I also have done the JB bore paste trick to some of my new barrels. I have an old Gun Bible that has a good how-to prep a new barrel write up using JB paste in it. So I follow his methods and do it to my more precision rifles... Does it help? I don't know. Doesn't seem to hurt though.

[RRP]

I also have done the JB bore paste trick to some of my new barrels. I have an old Gun Bible that has a good how-to prep a new barrel write up using JB paste in it. So I follow his methods and do it to my more precision rifles... Does it help? I don't know. Doesn't seem to hurt though.

So maybe if you believe it helps, and because of that you shoot more confidently, it leads to better performance.

Psychology. Mind over matter....and all that jazz.

[DeaconKC]

I've firelapped a few milsurp barrels over the years, but never a new factory barrel.

[muggsy]

Food for thought.

http://www.shootingtimes.com/2010/09...barrel_200805/

http://www.ktgunsmith.com/firelapping.htm

http://www.bellmtcs.com/FAQ/Fire_Lapping.htm

[hardluk1]

There is a difference in how you you treat a lower quality production barrel and a highend custom barrel. Don't think lapping a douglas or pac nor or kreiger and other top end custom quality barrels could improve them and could hurt as there already polished and air gaged . But on a production barrel it can't do anything but help it. Followed by a quality barrel break in.

[CJB]

Hammer forged barrels dont benefit much or any.

[AJBert]

Well, after reading much, a lot more research and the advice/opinions I've gotten on here, I've decided to get both rifles lapped before firing the first round through either.

Now I just need to decide between fire lapping or cold lapping. There's a couple of gunsmiths around that I trust and will find out what the charge for the cold lapping before deciding to try the fire lapping myself.

[AJBert]

Anyone have any experience with this fella's products? He doesn't carry .25-06 but I can get the .270 from him. Still haven't gotten any price quotes on cold lapping from a gunsmith. And I am still thinking about going with the JB Bore.


http://www.davidtubb.com/

[DeaconKC]

Tubb's stuff is the standard that everyone else is measured against.