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| < 16ga. Guns ~ M37 chokes |
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 Posted:
Wed Nov 13, 2024 8:20 am
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Joined: 04 Mar 2019
Posts: 1948
Location: Central ND
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I have a nice, 1955 vintage M37. The barrel is 28" and it is marked modified it measures .012" tighter than the bore. I don't believe the choke has been touched and it does shoot modified patterns. What I never realized until now is that the choke (at least in this barrel) is conical (no parallel section).
I suppose I should get a book on the Model 37, but hopefully someone here knows if Ithaca made all M37's with conical chokes.
If anyone knows of a GOOD book on the M37, please let me know. |
Last edited by MSM2019 on Thu Nov 14, 2024 6:57 am; edited 1 time in total
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Mark...You are entitled to your own opinion. You aren't entitled to your own facts. |
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Wed Nov 13, 2024 8:10 pm
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Joined: 24 Jul 2016
Posts: 558
Location: Ohio
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| Mark try the Ithaca forum on Shotgun World or try PMing Walt Snyder. He wrote the book on 37's. His family actually made the barrel on your gun. They made all pre Rotoforged barrels. His book is available from Ithaca Gun Co for $79.95. |
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| Posted:
Thu Nov 14, 2024 6:53 am
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Joined: 04 Mar 2019
Posts: 1948
Location: Central ND
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| Thanks, that sounds exactly what I am looking for. |
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Mark...You are entitled to your own opinion. You aren't entitled to your own facts. |
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Thu Nov 14, 2024 1:26 pm
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Joined: 08 Feb 2009
Posts: 1369
Location: Western WA
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Just a side comment in M37 chokes, the second M37 barrel I acquired on ebay was marked Mod but pattered more like Light Full. I had it opened up for skeet but the gunsmith noted the choke had previously been backbored to give it a tighter pattern.
B. |
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Thu Nov 14, 2024 6:32 pm
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Joined: 24 Jul 2016
Posts: 558
Location: Ohio
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I will say as the owner of too many Ithacas their fixed choked barrels pattern extremely well and tend to be a little tighter than marked. Mark I have a 1958 RD 16 gauge that's marked mod but thinks it's a handicap Trap gun.  |
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| Posted:
Mon Nov 18, 2024 11:16 am
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Member
Joined: 31 Aug 2005
Posts: 1269
Location: Nebraska
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| Brewster11 wrote: |
Just a side comment in M37 chokes, the second M37 barrel I acquired on ebay was marked Mod but pattered more like Light Full. I had it opened up for skeet but the gunsmith noted the choke had previously been backbored to give it a tighter pattern.
B.
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B,
Mod to LFull is only 5% difference in pattern results, a pretty fine line. Do you remember if the gunsmith had said the whole barrel was backbored, or if he meant only a bit of the bore behind the choke was done? The results would theoretically be similar.
Brian Meckler tested a later M37 20ga 3" Magnum about 20 years ago, the Full choke came in at .025" and he had the barrel backbored in .005" increments, choke along with it each time to maintain .025" constriction. In original configuration .615" bore he got results of about IC with STS Remington loads of target shot, and around 35% patterns with 3" Remington Nitro Mag shells of 4s and 6s. The target rounds topped 70% at .625", the Magnums hit Full percentages at a .630" bore.
My 20ga M37 Full barrel came with .615" bore and .025" choke constriction, I didn't count holes but the patterns were dense at 25 yards, my 16ga gun of the same year is marked Full but at some point had to have been opened as the choke constricts only about .016". |
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Bore, n. Shotgun enthusiast's synonym for "gauge" ; everybody else's synonym for "shotgun enthusiast." - Ed Zern |
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Mon Nov 18, 2024 12:11 pm
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Joined: 08 Feb 2009
Posts: 1369
Location: Western WA
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The choke was backbored an inch or two behind the choke. The difference in patterns was definitely more than 5%, more like 10% if not more. I’ll look for some photos, think I might have some.
B. |
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Mon Nov 18, 2024 12:25 pm
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Joined: 08 Feb 2009
Posts: 1369
Location: Western WA
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The choke was backbored an inch or two behind the choke. The difference in patterns was definitely more than 5%, more like 10% if not more. I’ll look for some photos, think I might have some.
B. |
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| Posted:
Mon Nov 18, 2024 1:14 pm
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Joined: 04 Mar 2019
Posts: 1948
Location: Central ND
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| I guess my real question is are the original chokes parallel or conical? |
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Mark...You are entitled to your own opinion. You aren't entitled to your own facts. |
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| Posted:
Tue Nov 19, 2024 12:17 pm
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Member
Joined: 31 Aug 2005
Posts: 1269
Location: Nebraska
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| Brewster11 wrote: |
The choke was backbored an inch or two behind the choke. The difference in patterns was definitely more than 5%, more like 10% if not more. I’ll look for some photos, think I might have some.
B.
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I've twice had chokes done that way by Mike Orlen, a recess or jug choke alteration that has the effect desired. One was to restore a previously opened choke, the other when he cut a barrel for me and I wanted it to retain some choke effect. Great option to have in the world of shotguns. |
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Bore, n. Shotgun enthusiast's synonym for "gauge" ; everybody else's synonym for "shotgun enthusiast." - Ed Zern |
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| Posted:
Mon Nov 25, 2024 6:02 pm
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Joined: 08 Feb 2009
Posts: 1369
Location: Western WA
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Mark, I checked out the M37 vintage 330xxx with the original 26 1/8” barrel stamped MOD. Using an inexpensive bore mic (accurate but tedious) found as you indicated the choke is conical about 1 1/2” long with 11 and a half thou constriction, with .660” full length bore, no backboring.
B. |
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| Posted:
Tue Nov 26, 2024 7:06 am
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Joined: 04 Mar 2019
Posts: 1948
Location: Central ND
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| Thanks Bruce |
_________________
Mark...You are entitled to your own opinion. You aren't entitled to your own facts. |
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