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What's up with the crowns on all my ruger pistols?

This is a discussion on What's up with the crowns on all my ruger pistols? within the Ruger Double Action forums, part of the Pistol & Revolver Forum category; For some reason the last 3 ruger pistols I have purchased has lines the go all the way around my crowns like little race tracks.....why? ...


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Old March 17th, 2017, 03:18 PM   #1
 
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What's up with the crowns on all my ruger pistols?

For some reason the last 3 ruger pistols I have purchased has lines the go all the way around my crowns like little race tracks.....why? Does this affect accuracy? Is it just sloppiness? It's hard to see them in the pictures due to phones camera. All advice and opinions welcome.
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Old March 17th, 2017, 04:11 PM   #2
 
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I have a SP 101 with pronounced such line; it does not affect accuracy.
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Old March 17th, 2017, 04:35 PM   #3
 
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Originally Posted by Nutty Ned View Post
I have a SP 101 with pronounced such line; it does not affect accuracy.
How did they get there?......were they not just polished out?
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Old March 17th, 2017, 04:54 PM   #4
 
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Those lines are not critical to accuracy. What is critical are the edges and corners of the rifling. That is where the bullet transitions to flight. Any issues on those edges will impact accuracy. If I am seeing what you are looking at it's probably just tool marks.
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Old March 17th, 2017, 05:00 PM   #5
 
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no problem if accuracy good.
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Old March 17th, 2017, 05:54 PM   #6
 
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Looks like tooling marks from the machining. I wouldn't worry about it.
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Old March 18th, 2017, 12:27 AM   #7
 
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Lol, come on Taconator! Have a snickers!

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Old March 18th, 2017, 08:44 AM   #8
 
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As the others have said, those tool marks are completely unimportant. Time to relax.
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Old March 18th, 2017, 08:51 AM   #9
 
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Those marks are normal for Ruger. I've seen worse.
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Old March 18th, 2017, 08:51 AM   #10
 
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really?
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Old March 18th, 2017, 09:22 AM   #11
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Crowns .... the very purpose of a crown is to release the bullet from the bore with equal pressure on the entire circumference of the bullet. If exit pressure is NOT equal, the bullet can literally be blown off course. There are many styles of crowns from a 45 deg cone to a 90 deg flat surface and they can all do their job quite well.

Crowns are the most critical when velocity is high and bullet weight is low. A good example of a critical crown is a 22-250 rifle ..... 50gr bullet at 3800 fps. As velocity is reduced or bullet weight is increased, crowns are way less critical. A good example of a non-critical crown is a 38 Special revolver .... 158gr bullet at 850 fps. Probably the least critical crown is on a 45 Colt revolver .... 255gr bullet at 860 fps. Fact is .... for most handguns, the primary reason to have a crown is for cosmetic purposes. The best crown for a handgun is called a "protected crown". It has the last 1/4" of the barrel counter bored then a slight bore taper. If the gun is dropped and lands muzzle first, it will likely cause a ding in the outer barrel but the actual crown is unaffected.

Taconator87, Your crowns in the above photos look pretty normal. They could have been finished a bit nicer but it wouldn't affect accuracy at all .... just cosmetics.
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Old March 18th, 2017, 10:41 AM   #12
 
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Those "LINES" do absolutely nothing regarding accuracy as the bullet NEVER TOUCHES the front of the barrel. The CROWN is the inside part cut and polished as you can see there are no lines on the inside. If it bothers you a lot and those are STAINLESS you could buff them out with some fine polish like FLITZ or MCGUIRES....

PS - if you want PERFECTLY POLISHED GUNS FROM TIP TO STERN THEN BE PREPARED TO SPEND MUCHO MORE MONEY!! Manufacturers like RUGER put there manufacturing processes and dollar spent on THE RIGHT STUFF THAT MATTERS . . GLITZ is just that...

GB45

Last edited by Golfbuddy45; March 18th, 2017 at 10:45 AM.
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Old March 18th, 2017, 12:09 PM   #13
 
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Thanks for the advice, wasn't throwing a hissy, I was just wondering. Ruger that I had in the past were nice and polished in that area. I guess it's just a sign of the times as they say. You should see the crown area on my SR1911 though, lol it is way chattered up. However, this gp100 does shoot quite nice.
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Old March 18th, 2017, 12:11 PM   #14
 
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Quote:
Originally Posted by Golfbuddy45 View Post
Those "LINES" do absolutely nothing regarding accuracy as the bullet NEVER TOUCHES the front of the barrel. The CROWN is the inside part cut and polished as you can see there are no lines on the inside. If it bothers you a lot and those are STAINLESS you could buff them out with some fine polish like FLITZ or MCGUIRES....

PS - if you want PERFECTLY POLISHED GUNS FROM TIP TO STERN THEN BE PREPARED TO SPEND MUCHO MORE MONEY!! Manufacturers like RUGER put there manufacturing processes and dollar spent on THE RIGHT STUFF THAT MATTERS . . GLITZ is just that...

GB45
I though about buffing it out with jb bore paste, however I'm afraid of the polish on the edges of the rifling.....any advice with that?
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Old March 18th, 2017, 12:14 PM   #15
 
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Quote:
Originally Posted by Iowegan View Post
Crowns .... the very purpose of a crown is to release the bullet from the bore with equal pressure on the entire circumference of the bullet. If exit pressure is NOT equal, the bullet can literally be blown off course. There are many styles of crowns from a 45 deg cone to a 90 deg flat surface and they can all do their job quite well.

Crowns are the most critical when velocity is high and bullet weight is low. A good example of a critical crown is a 22-250 rifle ..... 50gr bullet at 3800 fps. As velocity is reduced or bullet weight is increased, crowns are way less critical. A good example of a non-critical crown is a 38 Special revolver .... 158gr bullet at 850 fps. Probably the least critical crown is on a 45 Colt revolver .... 255gr bullet at 860 fps. Fact is .... for most handguns, the primary reason to have a crown is for cosmetic purposes. The best crown for a handgun is called a "protected crown". It has the last 1/4" of the barrel counter bored then a slight bore taper. If the gun is dropped and lands muzzle first, it will likely cause a ding in the outer barrel but the actual crown is unaffected.

Taconator87, Your crowns in the above photos look pretty normal. They could have been finished a bit nicer but it wouldn't affect accuracy at all .... just cosmetics.
Thanks for the information, I figured it was just cosmetic, I just need some reassuring second opinions. Would I be able to polish it out by hand and NOT hurt the crown? Maybe using jb bore paste?
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