Borescope findings

[PD Gohil]

Got a new Savage 110 7mm mag. Got about 70 rounds down the tube now. Did a standard shoot one clean for five shots then shoot three and clean for nine and then did two rounds of shoot five and clean. Then I cleaned it after about 30 rounds. Not deep just a general brush and swab. Starting to work on load development. Had some screwy results. So I pulled out the borescope thinking maybe I was starting to get a bad carbon ring. I see a ring but it doesn't seem like it's much. Also with a copper fouling I'm seeing why is it so streaky? Need some help interpreting these pics please.

Thanks
PGohil
WV

 

[DShortt]

All I see is a dirty barrel with fouling and copper deposits.

Hard for me to believe this is anything but a fouled, dirty barrel.

 

[ShtrRdy]

I agree with DShortt. It looks pretty good. Now get back to load development.

 

[EEP]

This looks normal. Don't be surprised to see tooling chatter marks after a good cleaning, this is also standard for a Savage. Get you some Thorro-Clean and clean her up. Look often with your borescope to better understand what normal looks like.

 

[std7mag]

I thought we all agreed that it was NOT a good idea to borescope a Savage!!??

Like all the other "I borescoped my Savage" threads, what is the target telling you?

I never shoot my magnums 30 rounds before cleaning.
I'll shoot 5, maybe 10 then clean with Hoppes/Kroil mix.

 

[280ai]

If that is a new bbl. You didn't need to clean after 30. we need info bullet powder primer and what do you mean by screwy results?

 

[jxb]

If you're gonna use a bore scope on it...

Suggest cleaning it well and run a dry patch or three through it before you stick your bore scope in it. Also adjust focus so you can see detail.

That said after doing that all you'll see is how well (or poorly) you cleaned it and of course what the new barrel looks like.

When I get a new barrel I clean/dry them, scope with nice sharp pics and save those off for nothing more than what it looked like new because years later I won't remember. After that if I'm going to put a rifle away for a while I'll use the bore scope after cleaning and I feel I have done a good job but want to confirm before running an oil patch through it and storing. Nearly always I'm disappointed with my piss poor cleaning job and attempt to do it better the second time, rinse and repeat until it's good or you've had enough abuse to your ego.

As for how it shoots, keep at it until you find something it likes.

 

[K22]

Define "screwy results".

Never owned a 7 mm magnum or Savage. But based on my experience with several other brands of rifles and cartridges, if you keep stripping away the copper plating with aggressive copper solvents to bare metal, the barrel is not going to settle in (reach an equilibrium condition) to give consistent results.

By employing the "break in" procedure your described, you never allowed the bore to stabilize. I would try cleaning with a mild solvent such as Hoppe's 9 and bronze brush, after the bore has been re-plated with copper.

There is a lot that can go wrong with load development, especially with a high intensity cartridge like the 7mm magnum, not to mention the rifle itself. Bench technique, shot sequence, shooter consistency (shoulder pressure, trigger control, flinching, etc.)

I assume this is a big game hunting rifle. A 1 1/2 to 2 moa load should be more than adequate. It is more important that a consistent POI be obtained, and you select a bullet with a history of good terminal performance than small groups.

 

[RabbitSlayer]

Dang man, get some patch out and accelerator for that copper and work it with a iosso nylon brush.

 

[std7mag]

It's not a benchrest rifle.

Personally, I'd run a few wet patches with a carbon cleaner, followed by a brass brush, then more wet patches till the patches don't show any more carbon.
Then a couple of dry patches.
And finish with an oiled patch.

When you next take it out, it may take 2-3 rounds to "settle in".

I did a thorough cleaning to bare metal on one of my Rugers.
Took almost 50 rounds to get the accuracy back of what it was shooting before I cleaned it.

I'm guessing if I took a borescope to it I'd be shocked at the condition of the bore.

 

[JFrank]

Looks a bit like copper streaks to me.

 

[PD Gohil]

Sorry it took so long to get back to you. Using norma 1x brass, fed 215m, h1000.
The screwy part was searching for pressure. Found it at 73gr, with a hard bolt lift and slightly flattened primer. had a good node as far as speed and on target around 72 and 72.5

Loaded 3x 72, 72.2, 72.5 and my speed went +50 fps for 72 and 72.5 and super hard bold lift. So I stopped to see what had changed. I believe it was just got to hot outside. Started at 75 deg, then hit 90 fast.

I don't think it needs taken down to bare metal, yet I'm not sure yet on THIS barrel when it's gonna need cleaned. Most of my Savage barreos are around 150 rounds deep clean and the 15 to get back to "normal" group.

Thanks all.

 

[Kracken McGraw]

Dang man, get some patch out and accelerator for that copper and work it with a iosso nylon brush.

That’s exactly the way I would go at it.
Then hit it with some Iosso paste.

 

[DShortt]

You never mentioned how many shots you fired with no cleaning before you decided to scope it and take these images.
What exactly were you trying to determine? Because again. It's just a dirty barrel of no particular significance.
If you did attempt to clean it with anything apart from perhaps a dry patch before taking these images........ Oooof.

 

[DShortt]

Sorry it took so long to get back to you. Using norma 1x brass, fed 215m, h1000.
The screwy part was searching for pressure. Found it at 73gr, with a hard bolt lift and slightly flattened primer. had a good node as far as speed and on target around 72 and 72.5

Loaded 3x 72, 72.2, 72.5 and my speed went +50 fps for 72 and 72.5 and super hard bold lift. So I stopped to see what had changed. I believe it was just got to hot outside. Started at 75 deg, then hit 90 fast.

I don't think it needs taken down to bare metal, yet I'm not sure yet on THIS barrel when it's gonna need cleaned. Most of my Savage barreos are around 150 rounds deep clean and the 15 to get back to "normal" group.

Thanks all.

I don't think I'd recommend relying on a heavy bolt lift to establish your load. Particularly given you're attributing it to a 15° temperature rise in the mid 70s to 90.

You're headed for trouble.

 

[JFrank]

Wipe out isn’t very effective on copper or carbon, Bore tech Eliminator and C-4 does a better job.

 

[lb-ft]

H1000 is quite temp stable.

Personally I’d back down to the bottom of the factory load data and work up. I’d certainly stay away from your 72gr & above, you’ve already found that to be no good from a safety and function standpoint.

You should find another accuracy load before you near 72gr.

Beat of luck. And great choice on the H1000 btw.