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7mm STW Brotherhood - For those who shoot the 7mm Shooting Times Westerner

 
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  #652  
Old 05-19-2012, 01:40 PM
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Re: 7mm STW Brotherhood - For those who shoot the 7mm Shooting Times Westerner

Quote:
Originally Posted by etisll40 View Post
7stw,

Would David Tubbs "Final Finish" product be an alternative here, to going to a gunsmith?

Your opinion welcomed.
Ed, I have not personally used it, don't know of anyone that has, but there's no substitute for elbow grease, and polishing compound. For a " course barrel, " JB bore cleaner is the finisher, but a actual lapping compound, and PLENTY of oil, is the first and best step. You have to feel and find those rough spots, and work those first. Then when everything feels the same, you can finish with JB, or Flitz polish. I had a barrel years ago that was rougher than a washboard, due to the previous owners neglect. I had nothing to loose, so I experimented with it, and when I got done, it would kill flies! JMHO. Take care Ed!!



BOB.
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  #653  
Old 05-19-2012, 03:28 PM
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Re: 7mm STW Brotherhood - For those who shoot the 7mm Shooting Times Westerner

Ed,

I too, have had to hand lap a barrel I tried JB bore paste and it works very well on extremely fouled barrels, but 7 STW is correct that an actual lapping compound is needed to truly smooth out a barrel.

I used Wheeler Engineering Lapping compound 600grit to smooth a factory .30-06 Barrel and I finished with jb bore paste to polish it.

I actually used the lapping compound with the JB to hold the lapping compound to the patch, I then used a Tipton brass Jag and used a back and forth motion the full length of the bbl. To keep the jag from exiting the bbl, I placed the rifle in my cradle and using a sheet of paper to protect the wall from I put the muzzle up against the paper I taped to the wall.

I first ran 2 oiled patches to saturate the bore then I ran a tight patch of JBs + the compound ten times through the bore, then 1 dry patch, two oiled patches and repeat..... I checked after 2 cycles and I was close. 1 more cycle and I was done, I checked by running 1 oiled patch and 2 dry patches slowly feeling for any drag. I then ran 2 cycles of JB bore paste by itself and then cleaned the bore with solvent and Kroil. All done. Now barrel cleans easily an went from 1.25" groups to .85" groups.

It's really easy to ruin a barrel, so be careful and use a bore guide as well as keeping the jag from exiting the barrel as stated earlier. Thankfully I haven't had to lap another barrel. It's a pain, but sometimes necessary.

Dan
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  #654  
Old 05-19-2012, 08:16 PM
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Re: 7mm STW Brotherhood - For those who shoot the 7mm Shooting Times Westerner

Quote:
Originally Posted by Dano1 View Post
Ed,

I too, have had to hand lap a barrel I tried JB bore paste and it works very well on extremely fouled barrels, but 7 STW is correct that an actual lapping compound is needed to truly smooth out a barrel.
.
.
.
It's really easy to ruin a barrel, so be careful and use a bore guide as well as keeping the jag from exiting the barrel as stated earlier. Thankfully I haven't had to lap another barrel. It's a pain, but sometimes necessary.

Dan
Hey 7STW

I have to agree with you gentlemen that the actual lapping compound it the way to go and it is what I use when I know a barrel really needs lapped and it has been scoped to verify. I didn't want to go there with a 'new' guy 'cause as mentioned you can screw up a barrel in few strokes.
600 to 800 to 1000 to JB w/ Kroil. Most factory's will usually...usually come in within 150 rounds, more fun than lapping. Just keep that barrel clean every 15 rounds. I've used Tubb's system in a 7Mag before and the jury is still out for me.

I'm retired '08 37yrs. Nuclear Power from Exelon still getting calls to come back help part time....great for paying for the hunts. All my life in Maint. you should see the diesel engines we work on. Steamfitter to middle Management. Reactor pipe joints within thousands for fit-up.
I really prefer range/bench time.
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  #655  
Old 05-19-2012, 08:59 PM
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Re: 7mm STW Brotherhood - For those who shoot the 7mm Shooting Times Westerner

I seem to be getting some vertical stringing with the Bergers now. The only difference between the good group in the single spot and the 8 shot stringy group is the shoulder bump. Will that move the group characteristics that much?
I'm also thinking I need to lower the powder charge to low 77's and work up. Things seem to open up after 78.0
Wonder if I should back off the lands just a twitch too?
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7mm STW Brotherhood - For those who shoot the 7mm Shooting Times Westerner-9.jpg   7mm STW Brotherhood - For those who shoot the 7mm Shooting Times Westerner-10.jpg  


Last edited by WapitiBob; 05-19-2012 at 09:34 PM.
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  #656  
Old 05-19-2012, 10:57 PM
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Re: 7mm STW Brotherhood - For those who shoot the 7mm Shooting Times Westerner

The stringy group looks like borderline ignition or barrel heating to me. I get that sometimes if the primer's wrong for the combo. Usually I scrap the powder or primer and see if it helps.
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  #657  
Old 05-19-2012, 11:34 PM
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Re: 7mm STW Brotherhood - For those who shoot the 7mm Shooting Times Westerner

Vertical Stringing. This might help a little.

CURES for VERTICAL STRINGING
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  #658  
Old 05-19-2012, 11:46 PM
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Re: 7mm STW Brotherhood - For those who shoot the 7mm Shooting Times Westerner

Quote:
Originally Posted by WapitiBob View Post
I seem to be getting some vertical stringing with the Bergers now. The only difference between the good group in the single spot and the 8 shot stringy group is the shoulder bump. Will that move the group characteristics that much?
I'm also thinking I need to lower the powder charge to low 77's and work up. Things seem to open up after 78.0
Wonder if I should back off the lands just a twitch too?

It's looking to me that the shoulder bump is working, you're haveing less horizontal stringing and the vertical stringing may verywell be due to barrel heat. I have a .243 AI that predictably will string up and to the right if fired more than 4 rounds. It's certainly a possibility, especially if you have a sporter taper barrel. I believe that you had to place a pressure pad in the forarm to settle the barrel, is this correct???? You may have a little too much for this load and this may make the stringing more pronounced. (just a thought)

I'm right at 78g of retumbo with my 180g Bergers as well,

7mm STW Brotherhood - For those who shoot the 7mm Shooting Times Westerner-img_20120423_201755.jpg

I need to re shoot this test load due to the fact that it was really windy, and I had a bit of shooters fatigue from being at the range for 6 hrs when I fired this group.

Your grop looks like a good group to me... give it another chance and shoot it off of the bags. I'm also thinking that the sled is forcing you to hold diffrently then how you shoot off of the bags and having an effect on the group.

Dan
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