Ronin
Distinguished Member
So,
It’s been,,,”a while”, but busy people can’t do work overnight despite the “Amazon” mentality of some folk these days (I want it tomorrow or I’ll cry)
This is a follow up of the thread linked here
www.thestalkingdirectory.co.uk
@griff - who works at GB Barrels in Scotland came good with his promise to supply a cut rifled barrel to replace the unsatisfactory (factory) tube
The barrel is a 9 twist and has been profiled to replicate the factory Sako varmint barrel as per measurements sent.
Once I received the barrel and worked into my schedule, I set about checking and measuring the bore and checking for straightness and concentricity with the outside diameter
I have to say the barrel is as straight as any I have ever seen - almost zero bow to the bore and 3/10000’s (three tenths) difference betteeen inner bore when running at zero and outside diameter of the barrel
An extremely good starting point
Borescope examination showed lovely crisp cut rifling with absolutely no machining marks - time had been spent finishing the bore and lapping carefully
So, having stripped down the Sako 75 and throwing the old barrel in the barrel bin I set about on the lathe, once the bore was set up to run at zero at both ends.
The tenon and action threads cut very well and having checked and re checked several times during the process that the bore remained with zero run out I set about chambering with a match 22-250 reamer (min spec)
This reamer has produced many rifles of adequate (my adequate) accuracy over the years and I have little doubt this will be any different
Once the chamber was completed and headspaced correctly it was finished off by a light polish
The barrel was then flipped, screwcut and crowned using the same care to set up the barrel as the chamber end.
A proprietary thread protector was put on, whilst I appreciate an act of altruism on my part to conduct the work, creating a blended thread protector would have taken quite a bit more time than I had
So a proprietary protector it is
The barrelled action was then prepped for proof and sent off on its merry way for torture testing
Once back, the weapon was reassembled and is now ready to be returned back to its very patient owner
Hopefully, this will happen this weekend and if the stars align I may be able to update further with some images of a target or two
Anyway - some images
It’s been,,,”a while”, but busy people can’t do work overnight despite the “Amazon” mentality of some folk these days (I want it tomorrow or I’ll cry)
This is a follow up of the thread linked here
Trader sold me a burnt out 22-250 ???
So, the timeline is a bit long on this but bear with me. I bought a 22.250 Sako 75 III heavy fluted stainless model from a well-known trader in Feburary 2022. So 14 month ago. My first centrefire rifle. Since then I've never really managed to get a good grouping of less than 2" at 100yds...
www.thestalkingdirectory.co.uk
@griff - who works at GB Barrels in Scotland came good with his promise to supply a cut rifled barrel to replace the unsatisfactory (factory) tube
The barrel is a 9 twist and has been profiled to replicate the factory Sako varmint barrel as per measurements sent.
Once I received the barrel and worked into my schedule, I set about checking and measuring the bore and checking for straightness and concentricity with the outside diameter
I have to say the barrel is as straight as any I have ever seen - almost zero bow to the bore and 3/10000’s (three tenths) difference betteeen inner bore when running at zero and outside diameter of the barrel
An extremely good starting point
Borescope examination showed lovely crisp cut rifling with absolutely no machining marks - time had been spent finishing the bore and lapping carefully
So, having stripped down the Sako 75 and throwing the old barrel in the barrel bin I set about on the lathe, once the bore was set up to run at zero at both ends.
The tenon and action threads cut very well and having checked and re checked several times during the process that the bore remained with zero run out I set about chambering with a match 22-250 reamer (min spec)
This reamer has produced many rifles of adequate (my adequate) accuracy over the years and I have little doubt this will be any different
Once the chamber was completed and headspaced correctly it was finished off by a light polish
The barrel was then flipped, screwcut and crowned using the same care to set up the barrel as the chamber end.
A proprietary thread protector was put on, whilst I appreciate an act of altruism on my part to conduct the work, creating a blended thread protector would have taken quite a bit more time than I had
So a proprietary protector it is
The barrelled action was then prepped for proof and sent off on its merry way for torture testing
Once back, the weapon was reassembled and is now ready to be returned back to its very patient owner
Hopefully, this will happen this weekend and if the stars align I may be able to update further with some images of a target or two
Anyway - some images
.
when I found out it was the barrel that was knackered.
a can only imagine whit it wid do in the right hands.
