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Re: When a shotgun is marked "Not for Ball"
WBLDon #538757 02/22/19 05:16 PM
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AZ but dreaming of KS
Drew Hause Offline
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AZ but dreaming of KS
Miller is correct; .2 mm = 0.00787"
I corrected my post.

https://sites.google.com/a/damascusknowledge.com/www/home
Re: When a shotgun is marked "Not for Ball"
Drew Hause #538758 02/22/19 05:16 PM
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The Great State of Tennessee
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I guess you just got caught up in your copy and pasting....
Re: When a shotgun is marked "Not for Ball"
2-piper #538780 02/22/19 06:59 PM
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Iowa
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Originally Posted By: 2-piper


The misunderstanding of this was one of the major reasons for changing the marks from "Not For Ball" to "Choke" As I recall most proof laws required one of these marks, depending upon time frame, on any gun having 0.2mm (0.008") of choke or more. It was I believe optional on a gun with any lesser amount of choke. A cylindder bore was of course unmarked.


That is correct under British rules of proof. Guns with a minimum of .008" constriction had to be marked Choke. But the person submitting the gun for proof could request that it be marked Choke if it had as little as .004" constriction.

Last edited by L. Brown; 02/22/19 07:00 PM.
Re: When a shotgun is marked "Not for Ball"
ellenbr #538806 02/22/19 11:19 PM
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North Alabama
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Originally Posted By: ellenbr
Originally Posted By: 2-piper
.....gun having 0.2mm (0.008") of choke or more......


Miller:

That would be 0.2cm or 2 mm.


Miller that is 0.2mm.....


Cheers,

Raimey
rse
Re: When a shotgun is marked "Not for Ball"
WBLDon #538812 02/22/19 11:55 PM
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Lynchburg TN
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Yes, 1 mm = 0.3937" or under the "Old" standard a full choke. I normally use the reciprocal of 1" = 254mm so 0.2 /25.4 = 0.00787 or rounded to three decimal places 0.008".

Miller/TN
I Didn't Say Everything I Said, Yogi Berra
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