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Author Topic: new blackhawk cylinder throats  (Read 648 times)

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Offline hillbill

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new blackhawk cylinder throats
« on: October 05, 2010, 03:26:20 PM »
just got my new blackhawk and was looking at the cylinder throats, on my tired old chink dial calipers they measure bigger than .450 and i can push a .452 lead bullet thru them with a dowel rod fairly easily. they dont fall thru but can be tapped thru without too much effort.the gun seems fairly accurate no more than ive shot it with 200grn lead .452 bullets.does this mean i wont need a trip to the cylindersmith?any opinions from yuall would be greatly appreciated!
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Offline tacklebury

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Re: new blackhawk cylinder throats
« Reply #1 on: October 05, 2010, 04:06:19 PM »
Sounds like your's has pretty decent throats.  8)  The other aspect of accuracy is how the throats compare to the lands of the barrel in relation to the throat size.  If you are getting good accuracy right away, I'd say you're pretty safe.  8)  It did take me about 100 rounds before things kinda leveled out for break-in.  I'd shoot a few different style bullets through it too, just to make sure everything works the way you want it too.  Congrats though on your new piece!  ;)
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Tacklebury --}>>>>>    Multi-Barrel: .223 Superlite, 7mm-08 22", .30-40 Krag M158, .357 Maximum 16-1/4 HB, .45 Colt, .45-70 22" irons, 32" .45-70 Peeps, 12 Ga. 3-1/2 w/ Chokes, .410 Smooth slugger, .45 Cal Muzzy, .50 Cal Muzzy, .58 Cal Muzzy

also classics: M903 9-shot Target .22 Revolver, 1926 .410 Single, 1915 38 S&W Break top Revolver and 7-shot H&R Trapper .22 6" bbl.

Offline Bigeasy

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Re: new blackhawk cylinder throats
« Reply #2 on: October 05, 2010, 04:26:01 PM »
What does your bore slug at?  Ideally your throats and bore will be the same.  Usually, .001 to .002 over throat / bore diameter results in best accuracy and least leading when using cast bullets.  If you use a fairly soft bullet .002 over you should get good accuracy with minimal leading provided your barrel is not way under or oversize.  Hard cast can work great, but they have to be used in guns with matching throat / barrel diameters, otherwise you will get gas cutting and subsequent leading.  A slightly oversize soft bullet will, under pressure, "slug up" to form a good fit, with minimal leading, though they may lead some at max velocities if you are loading to "Ruger only" specs.  Some guns do better with a gas check bullet at high velocities.  If your throats are significantly over bore diameter, there is not much you can do (a problem I have with one of my Colt .45 SA's).  If they are significantly tighter then the bore, the the cure is easy, just have them opened to match the bore.

Larry
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Personal opinion is a good thing, and everyone is entitled to one.  The hard part is separating informed opinion from someone who is just blowing hot air....

Offline ole 5 hole group

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Re: new blackhawk cylinder throats
« Reply #3 on: October 06, 2010, 08:22:01 AM »
I've seen a couple new accursport Ruger Bisleys that have cylinder throats measuring right at 0.452 with pin gauges.  Bore appears to be tighter (smaller) than the throats.
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