What's your favorite target crown on your ppc or Br and why?

[PGW Steve]

I have my own crown 'theory'. The smaller the bullet, the more critical the crown. A slight imperfection at the muzzle that results in a gas distribution anomaly, will have a far greater effect on a 20gr .17 vs a 300gr .338.

If an 11* crown is applied to a barrel that isn't perfectly centered, there will be a deviation along the axis of the bore of the contact point. Same goes for a chamfer applied that is off center, one 'side' of the barrel will be in contact longer, thus gas escaping out of the other side first.

If the muzzle is 90*, the contact can only be equal, regardless of how it was centered. For protection, a slightly recessed muzzle will fill that purpose, this is my personally preferred method. Next up, I've drawn the bores of all the different calibers, and created a brass sphere of the correct radius to provide a 45* edge break. I'll lightly lap the muzzle, spinning in the lathe, with the specific sphere until I've broken the edge of the groove to the 90* face.

I have excellent results on 17's, and this would translate into anything larger than those based on the crown 'theory'.

 

[FrankG]

I really doubt bronze can hurt stainless.

If the body of the brush is bronze, or the jag is bronze or stainless you would have to prove to me you can take a divot of stainless with bronze.

It’s not just the brush…. The brush and the fouling mixed in with it etc… is/can be the issues. Why can water erode rocks?

Or using a brush in conjunction with abrasive type cleaners even the liquid ones.

Also you ever watch how some shooters clean their guns? The amount of force I’ve seen people exert on the cleaning rod even if using a rod guide…might as well beat on it with a hammer.

 

[urbanrifleman]

It’s not just the brush…. The brush and the fouling mixed in with it etc… is/can be the issues. Why can water erode rocks?

Or using a brush in conjunction with abrasive type cleaners even the liquid ones.

Also you ever watch how some shooters clean their guns? The amount of force I’ve seen people exert on the cleaning rod even if using a rod guide…might as well beat on it with a hammer.

Well sure.

I was just talking about the pictures of the "chunks" or divots taken out of the crown. I'm saying that looks like something steel did that.

 

[Dimner]

Weird idea.

A bore guide type thing, that has a port to apply liquid and a doohicky that provides the function of a plunger (like a syringe) and the setup comes with a bore plug.

Idea being... soak the entire bore with the confidence of no leaking.