Barrel crown.

[vole]

Got a BRNO .22 rf as RFD transfer . Waiting for my variation so just dropped in to look at it and the dealer thought it had not been crowned properly when shortened and threaded. It looks cut flat to the face of the muzzle . On close inspection it looks like it has been very lightly chamfered like the pic below . I was hoping it would be ok and am looking forward to using it without having to get work done. What do you lads think ?

 

ps I think the crown on this pic might be recessed a bit . My BRNO only has the little chamfered edge. Please note this is not the actual one I am just using it because it looked similar. Mine has threads.

Edited September 8, 2010 by vole

[sitsinhedges]

That's a bodge up, I'd return it.

[vole]

*****r ! I was thinking that it might be cheaper to just get it done here rather than pay for transfer if I had to get it crowned. How much to do ?

[Cumbrian]

Interesting question. I'm no expert on barrel crowns, so all I can say is that this one doesn't look at like those on my .22 rimfires (CZ and Anschutz) where the rifling apparently continues as far as the very muzzle end, with perhaps a very faint chamfer right at the end. You appear to have a considerable recess before the rifling begins/ends. I'd defer to others on this matter.

[wymberley]

That's a bodge up, I'd return it.

Have to agree, but - it's not a bad idea to have the muzzle recessed as it does protect the crown from knocks. If you're happy with the rest of the gun and as it is a 22lr, why not have it threaded for a moderator and have that apparent mess tidied up at the same time then it wouldn't cost too much. Finishing off by negotiating, possibly through your RFD, for a small discount on the price that you paid.

Cheers

[al4x]

best option is to see if it shoots ok, if it does then leave it if not then go back and kick up a fuss

[Dunkield]

I had my .22 recrowned by a well respected 'smith and it looked a bit odd to me, compared to my centrefires anyhow.

It shoots like a dream, so as al4x says I would try it first.

Having said that yours looks like it has been counterbored? not seen that before...

[vole]

Cheers chaps. It is shortened and screw cut for a moderator . The photo is not the actual one though ,it is a pic I lifted off Google. I hope to get it by Sunday and take it to the range . Cost me £195 plus transfer fees. Seems a good gun otherwise but as you say the proof of the pudding is in how it shoots.

[vole]

I had my .22 recrowned by a well respected 'smith and it looked a bit odd to me, compared to my centrefires anyhow.

It shoots like a dream, so as al4x says I would try it first.

Having said that yours looks like it has been counterbored? not seen that before...

Not sure what counter boring is really sorry. The muzzle just looks flat apart from the very lip of the bore taken back a couple of mm at about 45 degree angle.

[DaveK]

The photo is not the actual one though ,it is a pic I lifted off Google.

 

So what was the point of that then . All the advice you've just had is based on what people thought was YOUR barrel crown

 

Another vote got get out and shoot it first.

[vole]

So what was the point of that then . All the advice you've just had is based on what people thought was YOUR barrel crown

 

Another vote got get out and shoot it first.

Not into wasting peoples' time ,maybe a re read of the post is in order.

[DaveK]

Not into wasting peoples' time ,maybe a re read of the post is in order.

 

Read the same as first time . I wasn't accusing you of wasting peoples time. The question is a valid one and we've all checked our crowns I'm sure. Just the pic I was querying.

 

BTW a counterbore gives you a raised ridge around the outside edge of the barrel end. The crown will be lower than the counterbore and therefore protected.

[vole]

Ok could have been clearer . Thought the pic resembled the actual crown itself accurately enough to ask the question though. Same but with threads .

[wymberley]

So what was the point of that then . All the advice you've just had is based on what people thought was YOUR barrel crown

 

Another vote got get out and shoot it first.

** ****!, guilty as charged. Yep, as per Dave and al4x.

Cheers

[vole]

Thanks folks.

[MC]

Cheers chaps. It is shortened and screw cut for a moderator . The photo is not the actual one though ,it is a pic I lifted off Google. I hope to get it by Sunday and take it to the range . Cost me £195 plus transfer fees. Seems a good gun otherwise but as you say the proof of the pudding is in how it shoots.

 

 

 

You haven't just changed your name from VIKING have you? :good:

 

It isn't a rifle at all is it? it is part of the water pump on a lightweight landie :lol: :lol:

[vole]

Okaaaaay ,it loosely resembles said rifle part sufficiently well for my purposes and lets have done with it. I am getting my coat. Computers are a rubbish way to ask stuff anyway . Harumph .

[DaveK]

landie

 

Is the feminine form of Landy. Mainly driven by Combat Barbie on the school run. :blink:

[pabs]

Lol, first off, a crown is really only there to protect the end of your barrel, or muzzle as we call it. Some barrels have a stepped crown. The actual muzzle is flat cut with a small 60 degree angle cut round the edges to help channel away the propellant blast,in a recess a bit like the photo, though thats a big recess! Best way to check the muzzle is to pop a q-tip in there and slow pull it out. Does it snag? If so, you need to remove the irregularities . Remember, the muzzle is very important as thats the last bit in contact with the bullet before its on its way to the target.

A well cut crown will show uniform powder marks all the way around it, another indicator that you have a well finished muzzle.

Edited September 11, 2010 by pabs

[Dekers]

Lol, first off, a crown is really only there to protect the end of your barrel, or muzzle as we call it. Some barrels have a stepped crown. The actual muzzle is flat cut with a small 60 degree angle cut round the edges to help channel away the propellant blast,in a recess a bit like the photo, though thats a big recess! Best way to check the muzzle is to pop a q-tip in there and slow pull it out. Does it snag? If so, you need to remove the irregularities . Remember, the muzzle is very important as thats the last bit in contact with the bullet before its on its way to the target.

A well cut crown will show uniform powder marks all the way around it, another indicator that you have a well finished muzzle.

 

Thats about the size of it really, but it does have to be protected, crowns come in all shapes and sizes, this is my .22WMR shortly after Neil McKillop sorted it for me a few months back.

 

Low quality as I used the phone and then tried to enhance them a bit on the PC, best I can do!

[pabs]

Thats nice. As you can see, the actual muzzle has a very small cut in it, ideally around 60 degrees. When a barrel is cut, you have to clean up the muzzle anyway, so a uniform 60 degree cut is made to tidy it up, remove the burrs and to provide an acceptable angle for the propellant/air to escape without upsetting the projectile. The rest of the crown is there to protect that lovely muzzle. (Some say that recess is cut at 45 degrees to further the escape of the blast but I say nuts, I've seen plenty square cut and they were just as accurate).

[Vince Green]

As long as its straight and the rifling is squared up on all the grooves/ lands thats good enough. The damage comes from pull throughs wearing the edges. Not a common problem these days.

[vole]

Top notch info thanks and very interesting. Was hoping for my 1 for 1 variation on the doormat but I think it will be Monday now. Will post a pic of what I meant but will see how it does on paper first. Will get it corrected if no good.