cerealthriller
Well-Known Member
has anyone else shot with it?
to see if another shooter gets the same results
to see if another shooter gets the same results
consistent odd grouping
- Thread starter Mungo
- Start date
Has your sako got the floating lug? Could it be that the lug is brdded nicely but there is play between action and lug?
No (or at least, I don't think so).
That's curious, and worth knowing.
Is there any other way of diagnosing this as the problem? Ie. additional tests/changes that could either confirm this or rule it out?
N.F.W.M
Well-Known Member
Using a marker pen, cover the cheek in ink, let it dry then cycle the bolt, I would do this dry firing and live firing, check the ink on the lug after each cycle/firing to see if it has worn off. Thats how I did it. Once identified it was remedied in literally 2 seconds with a file on the proud action screw and rifle shoots like a bug holing dream !
I would also agree with you that at some point you need to stop throwing money at the rifle and bin it off. I wasted a small fortune on the .243 I referred to in a previous post, and never got it shooting tight.
bewsher500
Well-Known Member
or take it back to the person who bedded it with a large pot of vaseline.....
Moray Outfitting
Well-Known Member
NO way that I know to specifically identify stress issues in the barrel. Odd behavoir with heat is indicative only - the rifle not you! Odd 'there' a given 
Everyone's missed the key thing - Muir and I were virtually agreeing on something!
I really do not know enough to cover in any depth - purely the symptoms I've seen on occassion seem to fit that as an explanation. The follow on suggestion of trying some temporary business card packing well worth a try - it may 'cure' a variety of potential issues. Craig Boddington refers to that too - I think in 'Make it Accurate'?
A bedding issue cant be ruled out - but I would expect a more inconistent effect if something was awry there.
If you head out this way, then a trip to pick Callum Fergusson's brains may be worthwhile?
Everyone's missed the key thing - Muir and I were virtually agreeing on something!
I really do not know enough to cover in any depth - purely the symptoms I've seen on occassion seem to fit that as an explanation. The follow on suggestion of trying some temporary business card packing well worth a try - it may 'cure' a variety of potential issues. Craig Boddington refers to that too - I think in 'Make it Accurate'?
A bedding issue cant be ruled out - but I would expect a more inconistent effect if something was awry there.
If you head out this way, then a trip to pick Callum Fergusson's brains may be worthwhile?
So - one extra symptom:
If I shoot with moderator off, first shot is to point of aim, second shot it 2 inches down, but horizontally correct.
If I shoot with moderator on, first shot goes to point of aim (after adjusting for a 2 inch drop caused by adding mod). Second shot goes right 3 inches and up 2.
If I shoot with moderator off, first shot is to point of aim, second shot it 2 inches down, but horizontally correct.
If I shoot with moderator on, first shot goes to point of aim (after adjusting for a 2 inch drop caused by adding mod). Second shot goes right 3 inches and up 2.
Moray Outfitting
Well-Known Member
Mod acts as a counter weight and affects barrel harmonics. Think fire hose held three feet back from nozzle - barrel effectively does that on firing. Key is for it to do it in exactly same way each time - harking back to f opening post - does it go point of aim if considerable left between the two shots? The business card thing is effectively influencing those same harmonics.
I could warn you to take care as you could GO mad with these tings... but I have met you....
I could warn you to take care as you could GO mad with these tings... but I have met you....
I could warn you to take care as you could GO mad with these tings... but I have met you....
Obsessive?? Me?
Your symptoms are exactly what I experienced, although your problem could have a completely different cause. I eventually got the barrel bore scoped and found bad throat cracking/damage/erosion. I also had heavy copper fouling that was impossible to remove. I had it re-barreled, I changed nothing else and its now super accurate. Of course it might not have been the throat causing the problem, it could have been Muir's 'stressed barrel' or something else but mine was definitely barrel related.
bewsher500
Well-Known Member
This is could preclude any concerns any effectiveness of the bedding job
unless there is more too it
So here is a picture to illustrate what is going on:
View attachment 69269
This shows THREE two-shot groups. All the shots from a cold bore are in the single hole at 6 o'clock on the target ring. All the second shots are in the group up and right. The one shot in that group that is a bit off is one I pulled.
This pattern repeats with montonous predictability, with cold bore shots creating a single ragged hole and second shots creating a group that is still under an inch, up and to the right.
View attachment 69269
This shows THREE two-shot groups. All the shots from a cold bore are in the single hole at 6 o'clock on the target ring. All the second shots are in the group up and right. The one shot in that group that is a bit off is one I pulled.
This pattern repeats with montonous predictability, with cold bore shots creating a single ragged hole and second shots creating a group that is still under an inch, up and to the right.
I would also be grateful if the wise and experienced could cast an eye over these pictures. These are of the recent bedding job. I know very little about this, but it looked a touch rough to me, so would appreciate comments:
View attachment 69270View attachment 69271View attachment 69272View attachment 69273
View attachment 69270View attachment 69271View attachment 69272View attachment 69273
Swap the stock? That would probably answer the bedding questions.
,
,
I don't know the answer but this sounds like a low/no cost option if you could borrow one. I was also interested in the "is the action screw a bit long" suggestion. If it is marginal it might only interfere when the barrel is warm and expansion has taken place. Might be worth grinding a mil off the end.
Best wishes,
David.
Best wishes,
David.
devon deer stalker
Well-Known Member
I wonder the same, my .243 Sako 75 shoots fine, and always has done, shock horror, it rarely gets a clean, but i guess we are clutching at straws here.
Cheers
Richard
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