Recrowning a rifle barrel

[ronan]

The older webleys and bsa's were great quality. A lad i know has a small collection including a lincoln jefferies bsa and a webley mk3. Sadly since they were taken over by spanish and turkish companies, things have got cheap and nasty.

 

[Tinbasherdan]

Mine is one of the last UK built models, I know that much. It's been a great gun , killed a LOT of rats and it's fair share of rabbits and wood pigeon , just annoying me now

 

[ronan]

Mine is one of the last UK built models, I know that much. It's been a great gun , killed a LOT of rats and it's fair share of rabbits and wood pigeon , just annoying me now

Are all the fasteners tight and seals good ?

 

[Tinbasherdan]

It's going to get a reseal, as its losing air pretty quickly, although it is delivering consistent power until it's down on air

 

[sardine]

You won't need to recrown it unless the crown has been damaged. Forget that as the cause.

Stop drinking that Brasso is my advice

 

[Tinbasherdan]

You won't need to recrown it unless the crown has been damaged. Forget that as the cause.

Stop drinking that Brasso is my advice

I need more than brasso, it's just the cherry on the everything-has-stopped-working cake

 

[mpats]

I wouldn't be thinking of recrowning yet! if it's been shooting fine and suddenly gone off it's not a damaged crown unless you've damaged it, and if you have a mod on it then that's unlikely. likewise, a barrel being shot out on an air rifle isn't common, and again it doesn't just suddenly happen. I would be looking on around mounts, especially scope mounts or trying a different scope, trying it without the mod etc.

 

[ronan]

If the crown is damaged you'll see where it got whacked with a magnifying glass and good light. Another thing is the outside of the barrel is quite often not concentric with the inside. So holding it between centres and running a DTI along it will tell you nothing really.

 

[Tinbasherdan]

If the crown is damaged you'll see where it got whacked with a magnifying glass and good light. Another thing is the outside of the barrel is quite often not concentric with the inside. So holding it between centres and running a DTI along it will tell you nothing really.

I did think of that to be fair , although it does seem pretty even, maybe a thou and a half

 

[Kent]

Been plinking with my little webley raider pcp today, and it's grouping all over the place, ran it over the chrono and its firing pretty consistent power throughout, so now in wondering if A) the barrel is bent or B) the muzzle crown is a bit snarled up and needs recutting. I'm going to run the barrel between centres on the lathe and run a dti along on the carriage, should tell me if there's anything significant going on there. If not that leaves me with re crowning . Bloke at the gunship reckons it's a 20* crown, everything else I've read States an 11* cut. Which is right and what's the best way to cut it

Very rarely does crowning effect an airgun much. you can polish the crown with a marble or ball bearing rolling it with the palm of your hand while covered in valve grinding paste.
most likely is a change of pellets is required or as its a PCP the barrel needs a good clean then re-leading in
bent barrels will still shoot they are just hard to get a zero on and even harder to get one that conforms l+R through the trajectory curve.
Manchester air guns might be worth a call? don't know who owns it these days

 

[Tinbasherdan]

Very rarely does crowning effect an airgun much. you can polish the crown with a marble or ball bearing rolling it with the palm of your hand while covered in valve grinding paste.
most likely is a change of pellets is required or as its a PCP the barrel needs a good clean then re-leading in
bent barrels will still shoot they are just hard to get a zero on and even harder to get one that conforms l+R through the trajectory curve.
Manchester air guns might be worth a call? don't know who owns it these days

might just be a case of needing a good old pull through then, will try it and get back to you!

 

[sardine]

When I worked in the trade we did the crowning with a pilot cutter tool, and brace and bit. 5 min job. I don't think it was rocket science to get a good crown.

 

[Justme]

I have the Raider II its very accurate & power is consistent (stays within 3 FPS) over a 50 shot spread (in .22) from 190bar fill.

If filled to over 190bar then the first few shots are erratic.

They do seem very pellet sensitive.
All work ok giving reasonable results but find the brand it likes & results are great.

New seals are available as I have just redone mine.

 

[Tinbasherdan]

Just stripped it down, discovered the leak was down to the valve not seating properly , as it was full of grit and crap. Supposed to have been cleaned when I took it in last...... Everything else seems to be in good nick, apart from the pellet probe o ring which has seen better days but isn't hanging off

 

[dai]

Is there a screw under the plug for recharging it to hold the barrel?

 

[Justme]

Is there a screw under the plug for recharging it to hold the barrel?

No the screw there just holds the air receiver. The barrel is semi floating, held at the breech end solidly & floats in a plastic holder & o-ring at the muzzle end. Fixing that end solidly results is terrible grouping.

 

[Mr shiney]

I have a Theoben rapid 12 at 48fp and it's very sensitive to leaks and pelt choice. It's quite prone to distorting light weight pellets and the accuracy goes miles out.

I use the Bisley pest control pellets which seem very consistent.

 

[Kent]

I have a Theoben rapid 12 at 48fp and it's very sensitive to leaks and pelt choice. It's quite prone to distorting light weight pellets and the accuracy goes miles out.

I use the Bisley pest control pellets which seem very consistent.

if its .22 turn it down to 28-32 ft lb and put it on bis mags worked a treat with mine.

 

[marfyboy]

I got mk1 rapid and my grouping went all over the place after fitting a bipod on the air bottle. It turned out the clamp was just touching the barrel so it wasn't floating. I also heard that some of the 50mm scopes can do the same thing.

 

[ronan]

Did you get it sorted Dan ? I was in the gun shop today and seen a nice BSA pcp. Its for sale for reasonable money, it spending more on the bottles, regs and hoses that might scare me off. Unless you can fill airguns out of argon welding bottles