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Old 03-28-2013, 08:06 PM   #11
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sorry for all the noob questions, but if my barrel slugs at say .430 do i wanna cast and size some .431s? and would the same go for a jacketed bullet? thanks

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Old 03-28-2013, 09:44 PM   #12
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Yes, maybe. It depends on the cylinder dimensions. If a round loaded with a .431 bullet will chamber properly, then yes.

Did you use a good micrometer to obtain this measurement? .001 is really small. Perhaps w/in the margain of error for your measuring tool.

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Old 03-29-2013, 03:17 AM   #13
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The reason you want an oversize lead slug, is to make sure you have a good bullet to bore seal. Hot gasses during the acceleration down the barrel can vaporize and deposit lead on the bore if it leaks by. Copper, being harder and melting at a much higher temperature is not so fit critical, however, copper deposition does and can occur, especially in over-sized bores, at faster velocities, meaning higher temperatures.

Make sure you are measuring land to land across the slug, when you make the bore size determination.

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Old 03-29-2013, 12:34 PM   #14
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good info! is the "land" the rifling? and so i'd size to .001 above the lands?

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Old 03-29-2013, 05:08 PM   #15
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The grooves on the slug pushed through the barrel are made by the rifling. The "lands" are the result of the slug forming to the overall barrel diameter. Many drive the test slug part way in from the muzzle and another just past the throat, to find if there is any wear, which will show up in the throat area. Of course, it's going to be tough to do the throat (or forcing cone), test on a revolver.

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Old 03-29-2013, 05:40 PM   #16
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ok so the "lands" on the slug will be thickest part of the sides of the slug, assuming the slug ends up being an oval shape?

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Old 03-29-2013, 05:56 PM   #17
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Well, hopefully you will end up with a cylindrical slug that has grooves inscribed in it. There have been experiments with odd shaped bores, even triangular, but modern barrel manufactures try to produce highly cylindrical bores.

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Old 03-30-2013, 04:52 AM   #18
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The grooves provide the greatest dimensions. The lands provide the bore dimensions. The number .429 refers to the distance across the bore from the bottom of the two opposing grooves. Measuring from the top of two opposing lands will give you a bore dimension. This could be .423 or .006 below groove measurements.

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Old 03-30-2013, 12:45 PM   #19
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ok, so i had it backwards on what the ''lands'' are. couldn't i take my calipers and measure the id of the muzzle? most calipers will measure id as well as od

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Old 03-30-2013, 08:08 PM   #20
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Quote:
Originally Posted by Ricochet View Post
ok, so i had it backwards on what the ''lands'' are. couldn't i take my calipers and measure the id of the muzzle? most calipers will measure id as well as od

Sure, but remember your caliper isn't as accurate as a micrometer.
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