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10-20-2009, 07:20 PM
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An older Parker 10 will have circa .040-.042 for "full" chokes. At least the dozen or so I've owned have been thus. In reality, .035 is plenty to produce very good close patterns with a short Ten.
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| The Following User Says Thank You to Don Kaas For Your Post: |
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10-20-2009, 08:50 PM
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Parker guns were bored "to deliver"; because of this there is no dimension that will verify that an individual gun is full choke, or any other choke except cylinder. Parkers made in Meriden were bored with a "nut borer" that was used to ream material from the choke until the desired pattern was obtained. This produced an "ogee" choke taper( ie two merged radii). Most of the time, the final boring produced a choke taper that was minimum diameter a few thousandths of an inch behind the muzzle.
Measuring and plotting this ogee curve in a few guns will soon show this pattern. Determining if an individual barrel has had a dent removed, or filed to square the muzzles requires both experience and luck, in all but extreme cases. Best, Austin |
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| The Following User Says Thank You to Austin W Hogan For Your Post: |
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10-20-2009, 11:04 PM
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Russ, some barrels are exactly the length that the records show while others are only close. I've had three Damascus Parkers where the barrels were shorter than what they lettered at by 1/8" or a whisker more while one set was longer by about 1/16". Barrels may have been trimmed or squared because of minor damage to the muzzles or some other acceptable explanation but personally I wouldn't worry about a 1/4" difference.
When you say "no matting" do you mean there is no matting whatsoever on the top rib? Is it a hammer gun from the early period in which ribs were not matted? An 1870's gun perhaps? |
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10-21-2009, 05:27 AM
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Dean; Yes an early gun with no rib matting just the Damascus pattern , Nov.1885 . Russ
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10-21-2009, 07:19 AM
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Russ,
My early 10 gauge Parker hammer guns have .804 bores! I did not have a bore gauge and mic'd the muzzel on the #2 frame lifter with about 30" barrels at about .774 and thought the gun was choked cyl and cyl. I shot the gun at the Southern a few years ago and while there Jent Mitchell measured the barrels and solved the mystery. I have measured the barrel lenghts on these Parkers, but can't recall exactly. I do think some vary from 1/16 to 1/4 of an inch. Harry |
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10-21-2009, 08:55 AM
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Harry, your 10 has .804 bores now. It probably left Meriden with bores closer to .790. Most of my early 10s have been around that figure as most early 12s are around .750. My last project, a 36" GH 10 from 1912 had pitted bores of .779 and chokes of .042 when I bought it. It now has clean bores of .790 with the chokes remaining at .042". With 1 3/8 oz of Bismuth #4s in an SP-10 shot cup it patterns "full and full"...
Last edited by Don Kaas; 10-21-2009 at 10:44 AM.. |
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10-21-2009, 10:31 AM
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Don,
You are probably correct. The gun, I was told, was restored by Del Grego and could well have been skim bored (if that's the phrase). It still showes some vey light pitting. Harry |
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10-21-2009, 12:49 PM
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Austin
Do you know of any gunsmith that still usess that method for chokes. I have a sleaved 20ga hammergun that I need the chokes opened and do not trust someone to just open them up and hope the shot pattern is good. David |
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