fluted barrels

I read an article discussing 22 lr hammer forged barrels installed in match guns. In that article they mentioned that in the hammer forged barrel turning the muzzle down (to accept a tuning weight) caused a slight constriction in the bore at the muzzle – essentially choke the gun – which they said was a good thing. However, turning the barrel at the breach (to fit he receiver) caused a similar constriction that they had to lap out.

They said the constriction would be specific to hammer forged barrel. I dont recall if they said how a button rifled barrel would react. My take away was to proceed with caution as machining a match barrel can cause unexpected (for a novice like myself) bore distortion.

Fluting in firearms is used to increase the cooling surface area for a given barrel mass. In air guns cooling is not an issue so fluting has no function other than to lighten the barrel or add cosmetic appeal. I happen to like the look of a fluted barrel! However, I would not have a gunsmith flute a round barrel because it might cause bore distortion. If maximum accuracy is a criteria in your project I would not do it. My first suggestion is that you start with a traditional round barrel blank that will achieve your target weight or if you have to have fluting then buy the barrel from a manufacturer that does the fluting in house and compensates for any resulting bore distortion.

It can do. Generally heavily fluted barrels will be made from a thicker blank to start with to avoid excessive flex. Fluting is often used to increase a barrels surface area to air cooling on live fire rifles. This is not really a issue on air guns.