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Thread: Question on modifying the front sight of a Spiller and Burr

  1. #31
    bobanderson is offline
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    Quote Originally Posted by Maillemaker View Post
    OK, Bob, I'm going to give it a go.

    I'm going to do some before and after load workup tests to see if I can definitively show improvement from the forcing cone alone.
    Suggestion,
    Slug the bore and compare that to the diameter of each chamber in the cylinder. Your problem might exist before the forcing cone.

    You might also check for misalignment where each chamber meets with the barrel.

    Do you have a Ransom Rest?
    Bob Anderson
    Ordnance Sergeant
    Company C, 1st Michigan Volunteer Infantry
    Small Arms Committee

    "I won't be wronged. I won't be insulted. I won't be laid a hand on.
    I don't do these things to other people, and I require the same from them."
    - John Wayne in "The Shootist", 1976

  2. #32
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    Hi Bob,

    I have slugged my revolvers before, I believe I do have one that needs the cylinders reamed out but most of the newer guns seem to have correctly-sized chambers. But I will double-check all of them as I work through them.

    I've also used my bore scope to take pictures of the various revolvers barrel-to-chamber alignment. Most of them are good:

    This is my Uberti 1858 stainless. It is the one I think has an under-sized chamber:
    https://www.youtube.com/watch?v=P2C7-zIcFzA

    This is a Pietta Colt. This one looks pretty good:
    https://www.youtube.com/watch?v=U17NDlvRFCw

    This is a cheap-o Walmart Blister Pack Pietta "1851 Navy" in .44 caliber. The barrel is canted relative to the frame, and as you can see the lock-up alignment is poor. You can see why these end up in blister packs in Walmart:
    https://www.youtube.com/watch?v=4oUtfKHl-u8

    Here is my Uberti Walker. It also looks pretty good:
    https://www.youtube.com/watch?v=i0ObGvxxofg

    I do not have a Ransom Rest. I just use one of these:
    https://www.midwayusa.com/product/68...-shooting-rest

    Steve

  3. #33
    bobanderson is offline
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    Your borescope works a lot better than mine, unless it's just because you're in a much shorter barrel. Never tried it.

    Not sure if you can see misalignment between the chamber and the barrel. I've seen one guy use a 7/16" drill bit, but that's pretty crude. What I'd do is buy the correct size minus plug gauge from Travers Tool and then see if it slips down the barrel and into the chamber when the hammer is at full cock. The good news here is that reaming the forcing cone will help a misaligned ball achieve a better entry into the barrel. At least that's what I suspect.

    A friend loaned me his Ransom Rest so I made a set of grip adapters for my 1858 Remington Tom Ball revolver. It showed me a lot about the accuracy potential of my load, but trying to reset the rest using only the crude sights of a revolver was difficult. I've since acquired a laser bore sighter that I'll use to reset it to the same spot at 25 yards, but that project has been delayed because Spring in Michigan has been delayed...big time!
    Bob Anderson
    Ordnance Sergeant
    Company C, 1st Michigan Volunteer Infantry
    Small Arms Committee

    "I won't be wronged. I won't be insulted. I won't be laid a hand on.
    I don't do these things to other people, and I require the same from them."
    - John Wayne in "The Shootist", 1976

  4. #34
    Join Date
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    The borescope is one of those cheapo-o Chinese jobbies. I bought it off of a facebook ad for $15. First one ran about 5 minutes and then produced static on screen. They replaced it. This one works fine. It's got like a 6 foot flexible cable that goes with it. It's kinda neet. It's waterproof. This weekend I'm going to use it to look inside my RV generator housing.

    Steve

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