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Old 12-09-2017, 09:24 PM
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HM2 crown bad?



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Does this crown look bad? My eyes aren't what they should be but it looks to me like rough wear/handling inside the red I marked on the photo. This is a 2009 American I bought used over a year ago and didn't shoot until earlier this summer. I shot it at 50 yards then when I moved the target to 100yds it looked like a shotgun sprayed the target. After a box of ammo I gave up and quit. I never looked at the crown until a few days ago when I got another scope I wanted to mount on it and looked at it through a loupe. It looks ragged to me but I'm no judge of what is acceptable wear. Anyway, here it is...

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Old 12-09-2017, 09:43 PM
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Needs a bit of touching up, you might try the old brass screw and lapping compound approach.
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Old 12-09-2017, 09:59 PM
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I thought about that but wasn't too sure about doing it on a 17.
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Old 12-09-2017, 10:09 PM
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Works on the 17, did one that had the visible chamfer.
Cleaned it back to a sharp edge with a minimum of effort.
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Old 12-09-2017, 11:00 PM
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I'd probably touch it up. It costs next to nothing to do yourself. Just make sure you get a brass round head screw small enough for a 17, and ensure you lap evenly. If you're using the hand drill method, gyrate the drill so you don't preferentially apply pressure to one spot or maintain the same off-axis angle. All will be fine.

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Old 12-10-2017, 12:55 AM
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I have an HM2 that has a chunk of the bore lining/rifling missing. You can clearly see it with the naked eye, its that bad. BUT for whatever reason the rifle still shoots lights out.
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Old 12-10-2017, 08:35 AM
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If it were mine I'd have my 'smith touch it up.
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Old 12-10-2017, 08:51 AM
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After firing some rounds how does the pattern at the end of the barrel look that is made by the escaping gas?
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Old 12-10-2017, 10:45 AM
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Quote:
Originally Posted by jaia View Post
Works on the 17, did one that had the visible chamfer.
Cleaned it back to a sharp edge with a minimum of effort.
And I also on my 17HMR. IMA I see a bit of a ding on the right edge Old Tricks. I use phillip head brass screws, after polishing em first with a drill with fine emery cloth, for addressing crowns. My way.
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Old 12-10-2017, 01:23 PM
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Quote:
Originally Posted by Mr GAP View Post
After firing some rounds how does the pattern at the end of the barrel look that is made by the escaping gas?
I didn't see a pattern after shooting the 50 rounds. I'm not sure I'd be able to on that finish.

Quote:
Originally Posted by Al the Infidel View Post
...IMA I see a bit of a ding on the right edge Old Tricks...
I saw that too. I thought about bringing attention to it but I figured someone would see it and say something.
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Old 12-11-2017, 12:16 PM
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I've seen worse, but with the 17, it won't take much to affect the group size. If you have a tool for recrowning, it's not hard to do. I know some folks do ok with a brass screw, but I'd rather see a good gunsmith or get a Manson reamer.
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