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Post by quest4170 on Nov 21, 2020 20:26:55 GMT -5
What's a good way to no your bullet is .015 to .020 off the rifleing lands when reloading
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Post by ET on Nov 23, 2020 8:46:47 GMT -5
What's a good way to no your bullet is .015 to .020 off the rifleing lands when reloading I use the old school method to measure land clearance. I take and shove a bullet up against the lands. Then using a small diameter aluminum rod I insert it into the bore until it contacts the bullet. Then I put my first mark on the ramrod. Now I take a dummy round with recommended OAL and load it. Repeat use of rod and again mark the rod. By measuring the distance between the two marks this will tell you how far you are from the lands. Lets say you are .040" from the lands. You would need to increase the OAL of the dummy round by .025" to obtain a .015" clearance from the lands. Then it's just a matter of double checking before loading your live rounds. |
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Post by pposey on Nov 29, 2020 0:10:21 GMT -5
I do the same thing, get a loaded round max length to the lands the same way, I put a couple of layers of painters tape on the rod and use a razor blade flat on the muzzle to mark the rod,
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Post by reloader22 on Nov 29, 2020 5:07:42 GMT -5
I get the principle of this method but wonder how precise it is if making hand drawn marks on the rod. Since we are talking thousanth's of an inch here, what to you do , using this method to ensure that level of accuracy? I would assume that the marks made on the ramrod are several thousanth's of an inch wide.
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Post by pposey on Nov 29, 2020 9:50:05 GMT -5
The cutting edge of a razor blade is pretty fine, and shows up well in painters tape. Flattened on the muzzle I'd say its repeatable as well.
There will be more variance in bullet shape leading to discrepancies I believe.
But it does give you a starting point.
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Post by billc on Nov 29, 2020 12:32:09 GMT -5
I use a Hornady OAL gauge.
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