Polishing throats

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Polishing throats

Post by Stix » 10 Oct 2019, 3:30 pm

So...new rifle...

Had a look down it...

What area seen in the barrel appears to be great...!!...however a few scratches in the lead--decent ones too, although this is probably made look a little worse due to the exceptional state of the adjacent barrel.

It was suggested by another guy (who is quite credentialed) that before i fire it, to give it a little polish with some JB or Autosol...

Now one of you kind fella's on here has given me instructions on doing this in the past :) , based on a rifle having had 600-1000 shots through it...
BUT...
What about a new one where only the lead/(lede) ( :unknown: ) area needs a little "de-burring"...?

My only concern is that this area is so short in length that i wonder if ill even feel the area that needs to be done, & so i might be unnecessarily polishing that which needs no polishing...?... :unknown:

Its a 20 cal, so to avoid depper than necessary penetration, would it be worthwhile to use a .22 cal brush with patch, or wind up a few layers of patch on a 20 cal brush...?

Aside from the 'dont do it' camp, any tips on the approach &/or technique...?? :unknown: ...??... :)

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Re: Polishing throats

Post by grumpy308 » 10 Oct 2019, 5:48 pm

Hi Stix. There is some good information on the Krieger barrels website on barrel break in with particular reference to the reamer marks across the throat. It is in the related topics section under barrel break in procedure. Regards Malcolm.
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Re: Polishing throats

Post by Apollo » 10 Oct 2019, 6:09 pm

Stix's

You can be your own worst enemy.

If you looked at hundred's of freshly chambered barrels you would condem most of them.

Whoever told you there was a problem needs to learn a few things.

Go and shoot the bloody thing, won't be too long and there will be no scratches to be seen. You will see other things that will give you a heart attack the way you are going at present.

If you use the paste's you mention you will create your own next problem, premature wear.....!!

BTW... a scratch on the barrel "leade" is going to have no affect on the bullet nor accuracy. Using cheap bullets is "your" biggest worry.... :allegedly:
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Re: Polishing throats

Post by bigpete » 10 Oct 2019, 7:04 pm

Hmmm....so many disgusting thoughts come to.mind......
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Re: Polishing throats

Post by marksman » 10 Oct 2019, 8:14 pm

gunsmith legend Bill Hambley-Clark jnr tells how to polish your bore in his book centrefire rifle accuracy if you have a copy Stix and Nathan Foster from terminal ballistics web site also explains how to do it in one of his books, I think the rifle accurizing one
you will not do any damage using JB or autosol to your bore or throat :wtf: , I know some very good precision shooters who always polish their throats before shooting for the first time to try and polish the burrs left from chambering
I will have a look for you tomorrow Stix and send there info to you :drinks:
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Re: Polishing throats

Post by Apollo » 10 Oct 2019, 8:34 pm

So, if using those products will not damage anything, then how is it supposed to fix a scratch. It's not selective breeding, if it's going to do anything to a scratch then it's going to do something to other parts as well. Polishing a bore and/or hand lapping is another thing altogether different.

I haven't read any of those "old fella" methods but I'm pretty sure they aren't practiced these days. I know some National & International Shooters and they don't bother with this sort of rubbish since their Match Grade Barrels are already hand lapped, then it's just a matter of a few rounds down the bore. Most do admit/comment that any imperfections in the chamber reaming will smooth out but will have little affect in the short term.

Stix is not shooting competition so I'll stick with "just go and shoot the bloody thing"... he'll die from worry rather than old age if he keeps up with this nit picking every fault he can see...that doesn't matter two hoots from a factory rifle... Sako or whatever.

Pity the poor Gunsmith if Stix ever had a Custom Rifle made for him, I'm sure there would be numerous faults he could find.... Better pay $10,000 rather than $5,000 for a rifle for the six months it has to be sent back for this or that little mark/fault. FMD.

It's just a Sako....!!!!
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Re: Polishing throats

Post by Stix » 10 Oct 2019, 9:18 pm

bigpete wrote:Hmmm....so many disgusting thoughts come to.mind......

As long as im not in them Pete, im happy...
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Re: Polishing throats

Post by Stix » 10 Oct 2019, 10:13 pm

Gees Apollo...

Im not picking faults...the advice given to me so far has been voluntarily given with no pressure, & comes from a respetable source after having had a quick gander down the tube...

And apparently polishing the throat is still done by some...

Im told its all about getting a barrel shooting quicker, minimising the fouling & extending its servicable life...

I agree with your thought process about if it takes away a scratch it will wear down other areas--hence the advice searching & looking for tips on what im feeling for etc.

Anyway...
Here, i poured us one each...but i insist...you have both ol'pal... :)
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Re: Polishing throats

Post by Stix » 10 Oct 2019, 10:29 pm

Thanks Marksman..
:drinks:
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Re: Polishing throats

Post by marksman » 11 Oct 2019, 8:10 am

Apollo wrote:So, if using those products will not damage anything, then how is it supposed to fix a scratch. It's not selective breeding, if it's going to do anything to a scratch then it's going to do something to other parts as well. Polishing a bore and/or hand lapping is another thing altogether different.

I haven't read any of those "old fella" methods but I'm pretty sure they aren't practiced these days. I know some National & International Shooters and they don't bother with this sort of rubbish since their Match Grade Barrels are already hand lapped, then it's just a matter of a few rounds down the bore. Most do admit/comment that any imperfections in the chamber reaming will smooth out but will have little affect in the short term.

Stix is not shooting competition so I'll stick with "just go and shoot the bloody thing"... he'll die from worry rather than old age if he keeps up with this nit picking every fault he can see...that doesn't matter two hoots from a factory rifle... Sako or whatever.

Pity the poor Gunsmith if Stix ever had a Custom Rifle made for him, I'm sure there would be numerous faults he could find.... Better pay $10,000 rather than $5,000 for a rifle for the six months it has to be sent back for this or that little mark/fault. FMD.

It's just a Sako....!!!!


aw come on Apollo, ease up
these "old fella" methods might smooth up the scratch in this hand lapped sako barrel just enough that it's not as bad as having the scratch
who are you to know :lol: what's wrong with Stix trying to improve :unknown: you are sounding pretty farken snobby in this post :lol:
Stix is a good bloke and has shown that by not taking what you have ranted as personal :wtf:
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Re: Polishing throats

Post by Apollo » 11 Oct 2019, 8:43 am

It's okay, he'll give me a hard time next we have a yarn on the phone.
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Re: Polishing throats

Post by SCJ429 » 11 Oct 2019, 9:37 am

I am not a hall of fame shooter but..... I use JB bore paste to polish the throat. I do it to overbore calibers to slow throat erosion. It seems to slow this process and help with fire cracking. You have to be careful not to knock the edges off you lands so I only patch the length of the barrel when I am removing the paste. I do not try and polish past the first couple of inches.

My gunsmith does not agree with my practices but has commented that the fire cracking has not been too bad on calibers like the 243, 7mm Rem Mag or 300/378 Wea Mag.

Could you destroy a barrel by carefully polishing the throat, I am of the opinion that you wouldn't. By the same token I do not think that I could improve the finish of a hand lapped match grade barrel with a bit of bore paste. All I feel it is good for is closing the pores of the steel that have been eroded by combustion.
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Re: Polishing throats

Post by marksman » 11 Oct 2019, 5:33 pm

alright I had quite a bit to read,

I do polish the throats of my bores to get rid of the carbon (HOW DARE YOU GRETA, YOU HAVE STOLEN MY DREAMS :lol:) and before shooting for the first time because I want to smooth out any anomalies left by the reamer but I wanted to make sure what I was going to write is what the authors of the books and not just what I do,

anyway to do this job polishing the throat you would use an old or undersized nylon brush on a coated or graphite cleaning rod with a patch smeared in autosol or JB wrapped around the brush so it is a tight fit in the bore but not to tight that you can't push the patch forward,

you start by first lapping the throat section of the bore lapping back and forwards spanning about 3 inches giving the throat roughly a dozen strokes (24 back and forward), at this point you are removing circumferential reamer marks from when the barrel was chambered, this will help to clear gun dril burrs from the throat and the first section of the bore

I would then extend the area to the length of the barrel stopping 3 inches short of the muzzle for another dozen strokes ( one of the book authors says minimum 50 strokes at least) then I pop the patch out and push some clean patches through soaked in break cleaner to get rid of the black from using the autosol but I dont try and get it all out, it would be impossible

having had borescopes down my match grade bores I know that I am not destroying anything in fact I am getting rid of the carbon ring as well as helping my new barrel run in easier, I have not seen rounding of the lands because of polishing with autosol
I regularly polish the throats of my rifles for the same reason as SCJ429 has put up and have found with a couple of my rifles that after losing accuracy a polish will bring the barrel back to life

here is what some say at benchrest central, its worth a quick read, even barrel maker Wayne Shaw from Shaw barrels gives his perspective on it http://benchrest.com/showthread.php?869 ... the-throat

this is not for everyone I understand that and that's ok, here is what is written in one of the books
"we are not going to be dainty about this, as you might read in some gun magazine article written by M.Y.Armchair. I want you to get in there and give that barrel a good kick in the pants. some foke really get there knickers in a twist about how to pass a jag through a bore, as though it were made of soft wax. if you want to play dolls and tea sets this is not the book for you" :lol:
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Re: Polishing throats

Post by duncan61 » 11 Oct 2019, 7:21 pm

I bore polished my 26 inch fluted stainless steel barrel on my 7mm Rem Mag it made a difference
.22 winchester .22hornet .222 .243 7mm rem mag cbc 12g
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Re: Polishing throats

Post by Stix » 11 Oct 2019, 7:53 pm

marksman wrote:alright I had quite a bit to read,

I do polish the throats of my bores to get rid of the carbon (HOW DARE YOU GRETA, YOU HAVE STOLEN MY DREAMS :lol:):


Bloody hell Marksman... :crazy:
I was wondering WTF you were on about.. :unknown: . :huh:

It was a deep well that coin had to drop down... :| .

Took its bloody time to get to the bottom...!!.. :roll:

...but im pleased to say it eventually hit the bottom & the sound waves did finally make their way back up to the surface... :thumbsup:

"HOW DARE YOU...!!!..."... :cry: :violin:

Hence...now i laugh... :lol: :lol: :lol:

The delay made it all the funnier...!!... :lol:
:thumbsup:

I appreciate the time & the info...from yourself & others... :thumbsup:
:drinks:
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Re: Polishing throats

Post by Stix » 11 Oct 2019, 8:00 pm

And by the way Apollo...

I meant the ice cubes were for you...!!...not the Scotch ya bastard...!!.. :lol:
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Re: Polishing throats

Post by Apollo » 11 Oct 2019, 8:22 pm

That's okay, I have a couple of bottles of single malt and don't need anything to water it down.

I'll probably have a couple or so whilst I'm loading some Berger's tomorrow night for my Sako 204R, then in the morning I'll probably setup out on the verandah and check the sighting in for a bit of fun out in the paddock. Been a few Fox's around close to the house of late. Saves on fuel not needing to drive anywhere.
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Re: Polishing throats

Post by Stix » 11 Oct 2019, 9:13 pm

Water it down... :o ...With Ice... :unknown:

Mate...If ice waters down your Scotch, you're not drinking it fast enough...!!... :)

For the most part, the ice is there for the temperature...

You see, Scotch is best consumed at "room temperature"...now unlike our Aussie reds, where room temperature is 15 degrees Celsius or so...room temperature at the distillery in the Motherland of all Motherlands,,.. Scotland,... ( :lol: ), is about what we have our fridges set at here in the great southern land... :)

Drinking spirits at such "room temperatures" as we know it here in our marvelous "free" country, will offer you nothing more than a severe alcomohol burn in the throat, & then right throughout the palette post swallow, & subsequent next few breaths...

To truly savour the complexities of a fine Scotch Whisky, one is best served to drink it "chilled" as we Aussies know it...!!

Having said all that...i just like all my alcohol cold as cold...the only way to drink a beer, nice Scotch, or some toxic North-Eastern European space fuel, is to drink it ice cold... :thumbsup:

Now...for a fitting emoji...
...""... :drinks:...""...
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