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View Full Version : Cast Boolit Fit In Revolvers


pietro
07-24-2019, 03:29 PM
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(Courtesy of NRA Publications - Aug 2019 American Rifleman)


https://i.imgur.com/pkAUaFxl.jpg

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Outpost75
07-24-2019, 04:12 PM
Less informative and far sketchier on the technical whys and wherefores than our "sticky".

Seems as if author didn't really understand either and it was a case of the ignorant leading the blind...
DougGuy
07-24-2019, 04:25 PM
The perfect fitment for all centerfire revolver calibers is boolit sized .001" to .002" greater than groove diameter, cylinder throats sized .0005" to .001" greater than boolit diameter.
mdi
07-25-2019, 11:13 AM
K.I.S.S. has worked for me for about 30 years; size bullets the same diameter as the cylinder throats...
luvtn
07-25-2019, 12:31 PM
BINGO!
luvtn
fredj338
07-25-2019, 12:32 PM
In revolver its almost more important to get the cyl throats right. Does little good to go 0.001" over groove dia then have throats 0.001" smaller than groove dia.
fredj338
07-25-2019, 12:33 PM
K.I.S.S. has worked for me for about 30 years; size bullets the same diameter as the cylinder throats...

Unless the throats are 0.001" smaller than groove dia. My RBHSS had 0.4505" throats on the avg. It shot ok, leaded early. After opening them to 0.452", accuracy was about 50% better & now no leading.
DougGuy
07-25-2019, 12:56 PM
K.I.S.S. has worked for me for about 30 years; size bullets the same diameter as the cylinder throats...

This only works if the throats aren't already too small.

What are you going to do if you cast, size and lube a batch of boolits sized to the throats, then they sit for a year and suddenly the ammo won't chamber because the boolits have gained .0003" as they age hardened?

Ruger single action revolvers are notorious for uneven throat diameters. Can't size to uneven throats. Well, you *could* but that certainly flies in the face of the K.I.S.S. ideology.

There are good reasons why the arrangement I mentioned is near perfect for a revolver.
mdi
07-26-2019, 11:28 AM
Unless the throats are 0.001" smaller than groove dia. My RBHSS had 0.4505" throats on the avg. It shot ok, leaded early. After opening them to 0.452", accuracy was about 50% better & now no leading.

Yep. But I slug the barrels and measure the throats of all my guns before I shoot any lead. One important factor for shooting lead bullets is to know your gun. Otherwise it's just a WAG...