Tight chamber and marks on projectile

Mystery solved round two. Damage to throat/freebore.
Hi team, I just got the borescope so when in motion things seemed clear to me but I can see how the static pics can be confusing. Ran a bit more tests and tried to get the screen cuts in focus, so hopefully this helps.
Photo 1, borescope without mirror, the circled part is where the deformation is.
Attachment 255951
Photo 2, borescope with mirror, center of mirror is how the damage looks like from another angle.
Attachment 255952
Photo 3, borescope without mirror. Jammed a round in there, can see the copper jacket scraped and left on there. explains the tight chamber close and loss of accuracy.
Attachment 255953
Photo 4, borescope with mirror. The copper jacket looks really obvious in this one.
Attachment 255954

I've really tried cleaning but it was at best clean the scraped copper jacketed, I do believe this is a gun smith job now if not buying a new barrelled action job :P
Still thanks a ton for the support and knowledge from the team. Learnt lots and lots, keep all that wisdom and experience flowing please!

Turn it into a 6 mm ARC mate. Just a new barrel.

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Originally Posted by DeonK

Turn it into a 6 mm ARC mate. Just a new barrel.

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One day I will mate, but I'm not done with the Grendel yet :P
We should go shooting together sometimes, lemme know when you're free :D

A light ream might do it

any ideas on what might have caused that burr?

From experience - Cleaning rod or something else stuck down the chamber te remove a stuck case.

Blip is right, a light ream should fix it. Reach out if you cant manage loclally.

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Originally Posted by STC

any ideas on what might have caused that burr?

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Honest no clue aye, could have been improper cleaning.

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Originally Posted by Jaco Goosen

From experience - Cleaning rod or something else stuck down the chamber te remove a stuck case.

Blip is right, a light ream should fix it. Reach out if you cant manage loclally.

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Will try to find local first, will definitely sing out if I haven't got any luck.

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Originally Posted by Jaco Goosen

From experience - Cleaning rod or something else stuck down the chamber te remove a stuck case.

Blip is right, a light ream should fix it. Reach out if you cant manage loclally.

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Just as well I didn't have cleaning rod the other day then....bit of #8 wire that had broken on nearby fence was straight enough to pop out problem case.... Shit I'm a hori lol

@Micky Duck
Just wanted to advise I replied yesterday to your PM.

Apologies for imposing this on the thread. My only option to communicate this to MD.

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Originally Posted by Micky Duck

Just as well I didn't have cleaning rod the other day then....bit of #8 wire that had broken on nearby fence was straight enough to pop out problem case.... Shit I'm a hori lol

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Oh that will be really good for the barrel.....

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Originally Posted by BRADS

Oh that will be really good for the barrel.....

Sent from my SM-S916B using Tapatalk

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I know I know....but a howa stainless steel barrel will be shit loads harder than old semi rusty #8 and needs must and all that,it was very straight and slid through easily. I shouldve known better...hot loads and barrel was getting warm,case jammed and tiny extractor just popped back over it each time,case popped out no trouble with light push from inside it. but them wallabies just kept sitting there tempting me to try again....bastards.

MIcky Ill have to come over to check your roo guns barrel.

I might just bring something along to defend myself against those zombi roo's you know.

The rusty wire aint as bad an idea as the two fellas that shot a 22RF down a Lee Enfield to get a stuck case out.

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Originally Posted by Jaco Goosen

MIcky Ill have to come over to check your roo guns barrel.

I might just bring something along to defend myself against those zombi roo's you know.

The rusty wire aint as bad an idea as the two fellas that shot a 22RF down a Lee Enfield to get a stuck case out.

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Aye aye capt, do tell more?

Some years ago I were hunting in a very dry and very dusty area in Africa. Dont know how or when but at some stage the farm owner and his mate started fiddling with a old No4 Mk2. Upon closer inspection I found a case had gotten stuck and would not budge.

Told then to let it go, everyone can shoot my 243 Win, it seems to kill real good - and got busy gutting the last 10 or so animals we had harvested.

Heard a shot and was kinda annoyed as who the hell fires a rifle this close to us without even warning.

Yup....you guessed it. These two fellas had managed to get the 303 case out.....by shooting a 22 down the 303s barrel.

Im happy to report I'm safe - I survived another 8 years of hunting with these two good buggers. (The 303 in question's career ended some 3 years later when the barrel were washed out.)