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September 21, 2010
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I recently discovered my early 7445 (1990) has chamber throats smaller than .429.
I am sure this is the cause of pressure problems I always had with this gun,
especially with converted rifle brass. I quit shooting it after DW fixed it the second
time for excessive cylinder endshake.
I would like to find a good gunsmith that specializes in this kind of work.
Know any?
MagNaPort did an excellent action job on a S&W 629 of mine including recutting
the barrel throat. I have asked them if they have a DW expert, but so far no reply.
Thanks for any information! .....Nemo.....
February 11, 2010
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Are you able to get the cylinder off ? Remove grip, push in trigger assembly
lock button behind trigger guard, remove trigger assembly, remove crane
lock and pull out crane and cylinder. I would contact Eric at EWK arms.
I bet he can do it. If not any good machinist should be able to open up
those cambers, I would not think they would have to be an expert on
Dan Wessons
-Blacktop
September 21, 2010
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Thanks for the info. I have been in contact with Eric.
MagNaPort has recommended Ron at American Arms Engineering so I will give
him a call as well.
An example of what a barrel throat re-cut from MagNaPort looks like and the
shooting results. Not shown is the 26 grain target which was as good and I settled
upon for use in all the magnums.
I am not considering a barrel mod for the 7445 as it almost looks like it is chrome
plated. Is that true? My Beretta shotguns are and I like it!
February 11, 2010
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Nemo said:
I recently discovered my early 7445 (1990) has chamber throats smaller than .429.
I'm confused 
so it's the barrel and not the cylinder throats ?
If so what about a new barrel ? Or is the .429 a DW standard ?
-Blacktop
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December 4, 2011
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Aren't all 44 caliber actually .429"? Thats what I thought I read in my reloading manual. Kind of like 38 cal is .357".
Anything worth doing is worth doing well.
My father
If a man designed it, and a man built it, then a man can fix it.
My grandfather
September 21, 2010
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It's the chamber throats. I included that last picture just as an example of the
kind of work MagNaPort can do. A regulation jacketed bullet will not go thru
the chamber throats. I don't plan on doing anything to the barrel as it looks
like it might be chrome plated.
....Nemo....
September 21, 2010
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Scorpio:
The bullets are supposed to be .429 although I have some cast SWC's that
are as large as .432.
The chamber throats are all over the place going as high as .432 in S&W's made
in the 80's. I have several of these hence the larger cast numbers. S&W
chamber throats have gotten smaller over the years and are now right about
minimum. The Charter Bulldog I just got is right at .429. A jacketed bullet
just barely will go thru the throats.
Having chamber throats too small is obviously a bigger problem than having them too large.
....Nemo....
February 11, 2010
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DW barrels are not chromed lined like Beretta's , If you really want
the throat opened up it can be done. If you don't want to do that
you can purchase a new barrel from DW for $105 and have Keith
measure the throat before he sends it if you really want to fix the
problem.
-Blacktop
September 21, 2010
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Thanks for the idea. My problem is with the cylinder chamber throats being too
small BUTT: I did not realize the barrels were still available. Stocking one
or 2 to play with might not be a bad idea. Be interesting to directly compare
a 17° barrel throat with the factory one.
...Nemo...
February 11, 2010
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It would be easy enough to get the cylinder off and send it to have
the work done. That would save alot of moneys over shipping the
whole gun UPS overnight.
-Blacktop
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