Others Understanding a proper barrel crown

[Murfdurf82]

I'm posting a picture of a .177 barrel from a Nova Liberty. The barrel doesn't appear to have a crown but I don't know a proper crown appears to be so maybe I'm incorrect. This I have no knowledge of so if anyone has any info they can pass along if love it. It's pulled apart to clean and port as it felt much more inaccurate than my 22 Nova. The end of the barrel is flat so I assume it has no crown.....

 

[Madhatter]

Check this video out

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[pan60]

not sure I believe a dremal is the best option for re-crowning a barrel but some may like it?

first off to properly crown a barrel you need to be able to do it from the center of the bore and if you can cant its just a hack next you would want to know what a good able for a crown would be lets say 60 degrees is to steep because you pass;s or air could escape prior to the pellet or slug disengaging the lands some I would say let base the angle on just how deep the grooves are so for giggles maybe we go 75 or 80 degrees?
the you would need to make sure there nothing proud in the groove that could lead to potential biuld-up
I sy a dremal is just not the best option if it works a say its just luck?
anything you would do to a barrel should be done on the bores center and then with some research and understand a barrel if not properly handle has inherent stress you cut that barrel and you potentially ruin it.
just my two cents

 

[Madhatter]

There are several people using this method on the liberty barrel including me. It worked very well but I used a drill. I wouldn't use a Dremel. It's to fast.

 

[Billm]

I'm posting a picture of a .177 barrel from a Nova Liberty. The barrel doesn't appear to have a crown but I don't know a proper crown appears to be so maybe I'm incorrect. This I have no knowledge of so if anyone has any info they can pass along if love it. It's pulled apart to clean and port as it felt much more inaccurate than my 22 Nova. The end of the barrel is flat so I assume it has no crown...

That could very well be a 90 degree or flat crown. The true definition of a barrel crown is the total face of the muzzle, not just where it meets the rifling. The important part for the crown is that it is perpendicular to the bore so that the pellet leaves the rifling at the same time. If the face/crown of the muzzle is not completely perpendicular to the bore, air will exit the side that is not in contact with the bore creating yaw or wobble. A flat crown is very accurate, the down side is that the lands at the exit of the muzzle are not protected. A chamfer/recess at the bore adds protection. I’m guessing that lower cost barrels use a flat crown to reduce the machining steps and cost. A flat crown is accurate though, if undamaged. In answer to your question: it is a flat crown. I wouldn’t mess with it unless you have a known accuracy issue or just want to experiment. I’m sure my post will be controversial lol.