good or bad crown ?

[Hubertus]

i received a new pcp rifle today but the precision at ~27yards was terrible.

would you say the crown could be the problem ?

it looks handmade to me and there is no force needed to push a pellet through whole barrel and no choke.

i will not tell you the brand because im waiting for a response from my dealer.

 

[DeadEyeDill]

If that's the muzzle end its horrible! Even for a hand crowning. 

To me it looks like the breach end seeing the rifle has been relieved. 

I'm just curious what gun? And was it new?

 

[Fire_at_will]

Sounds like you have multiple problems. Does the pellet have grooves in it after you push it thru?

If the pellet is not engaging into the land grooves, then the barrel is not rotating the pellet. If the pellet is not rotating, then it can not over come turbulence around the skirt in the first few feet of travel.

If the crown is not cut square to the bore, one side of the pellet will exit prematurely, and it will be slightly askew.

Just by looking at the pics, nothing about that barrel looks good.

 

[Bob_O]

Wow....that looks terrible.

Sorry.

 

[nervoustrig]

Yeah the bevel on the end looks rough and would be at least cause for concern in most cases, however in this case it is irrelevant because the rifling is removed for some distance down into the bore. That’s the real problem. The cutter has removed the rifling at a shallow angle which makes it pretty well impossible to make the rifling terminate at a distinct location. The rifling should be sharp and fully formed up until it suddenly discontinues at the muzzle. In the photo, the rifling gradually tapers away.

 

[broekzwans]

That looks like a crown that has been made using a countersink drill bit using a rotation speed that was way to fast and an ugly taper towards the rifling. A crown like that is horrible and will not do any good to accuracy

 

[douger]

looks like a child did that 

 

[scubajeeper]

If I received that as a new gun, I would demand my money back. There is NO excuse for that!

 

[sonny]

that was done with a black&decker pecker wreckor.

 

[jarmstrong]

I would wager that it is made in China----best quality control there is, NOT

get a refund or replacement

 

[Rodeo]

That must have been done by hand. Even a cheap lathe would do better than that.

 

[kzz1kaw]

Bad crown guessing a hatsan?

 

[Zebra13]

Hubertus,

Attached is a picture of a good crown. I have never seen a crown as bad as yours. Truly awful...

Justin

 

[elh0102]

This is a joke, right? No one could possibly represent that as a legitimate crown. 

 

[castbullet]

You have to let us know who does such a fine job.

 

[STO]

Well don't leave us hanging eh? Someone could be out making the mistake of buying this brand rifle RIGHT NOW. Please, before someone else falls into this trap, tell us what brand is shipping rifles like this? 

 

[nervoustrig]

FWIW, the only crown I’ve seen that was that bad was one from a fledgling company, never on a legit production gun. Granted I’ve seen a few from Crosman and one from SPA that had damaged rifling at the muzzle that apparently were from using a crowning tool with a non-floating pilot. Just atrocious to see an otherwise decent barrel ruined by such carelessness. I can deal with touching up a rough crown, that’s easy enough, but it’s a pain to have to chop off the end of a brand new barrel to fix that mess.

 

[Hubertus]

guys, you have to be patient. i cant tell you the brand yet but its not available in the us yet but in europe, its a short gun, the stock is made by minelli, shrouded, pricing in $ 500-650 i guess, steve made a video at shot show but no review yet and its light weight but no pistol. 

 

[Bob_O]

So you can't tell us but you gave enough information for someone to figure it out?

Why not just say?

 

[boscoebrea]

 just do a calculated guess,we will get the answer some enough. the guy can not say now so what,he is working out a deal and his post gives him ammunition to get a refund or whatever...I think it is a smart move...butt sooner or later he should tell us the outcome and the brand.