Author Topic: How to determine caliber of rifle?  (Read 3489 times)

radar

  • Guest
How to determine caliber of rifle?
« on: February 02, 2013, 03:12:06 AM »
I am new to this site (and to flintlocks).  Just purchased a rifle built by Art Holly and has Bill Large barrel.  Very pretty old rifle and does not appear to have been shot much.  I was told it was a .32 but I can insert a .358 diameter rod in the muzzle.  Measured muzzle with calipers and get around .405.  I'm leaning toward a .40, but it may be funneled as I have read on this site Mr Large did this sometimes.  Any help/ideas greatly appreciated.

Offline Bob Roller

  • Hero Member
  • *****
  • Posts: 9454
Re: How to determine caliber of rifle?
« Reply #1 on: February 02, 2013, 04:22:48 PM »
If you have a "funneled"Bill Large barrel,I can tell you now that Bill didn't
do the funneling. Find a machinist with a set of small hole gauges and have it
checked properly.Dial calipers are erroneously called "Verniers" but a lot
of us called them "Verynears".

Bob Roller

Offline Dennis Glazener

  • Administrator
  • Hero Member
  • *
  • Posts: 19406
    • GillespieRifles
Re: How to determine caliber of rifle?
« Reply #2 on: February 02, 2013, 05:18:01 PM »
Quote
I am new to this site (and to flintlocks).  Just purchased a rifle built by Art Holly and has Bill Large barrel.  Very pretty old rifle and does not appear to have been shot much.  I was told it was a .32 but I can insert a .358 diameter rod in the muzzle.  Measured muzzle with calipers and get around .405.  I'm leaning toward a .40, but it may be funneled as I have read on this site Mr Large did this sometimes.  Any help/ideas greatly appreciated.
I assume you want to verify that it is in fact a .32 bore? If so an easy way to do this is by gently inserting a 5/16th drill bit, using the smooth end not the cutting end of the bit. The 5/16th bit is .315" and should slip into the bore beyond any cone/funnel cut in the muzzle.
Dennis
"I never considered a difference of opinion in politics, in religion, in philosophy, as cause for withdrawing from a friend" - Thomas Jefferson

oldarcher

  • Guest
Re: How to determine caliber of rifle?
« Reply #3 on: February 28, 2013, 07:06:40 PM »
I am sure that there are many more knowledgeable people on the Forum than I, but this is how I measure bore diameter.
Make sure that the barrel is clean, then lightly and thoroughly lube the barrel. Select a lead ball slightly larger than the barrel and gently tap the ball completely into the barrel making sure that it contacts the grooves completely around the barrel. Carefully insert a ball puller into the ball and remove it. This will give you an accurate slug that can be measured with a Mic or Vernier. I always do this with a new barrel, or one new to me, so I can determine a base to start my load workup. Hope that this helps. Good luck with your rifle!