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Old 11-19-2019, 02:51 PM
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Old 11-19-2019, 04:20 PM
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I drilled the holes by using calipers to locate them, no jig. Don't remember the number but can explain how if anyone is interested.
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Old 11-19-2019, 06:15 PM
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I would be interested in how you located rear hole and size. Iíve often though that it could be done. Would appreciate your info. Thanks
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Old 11-19-2019, 09:45 PM
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OK, I've been shooting on and off for a number of years, and since I retired 5 years ago, have had time to get back into it a bit more. What is the purpose of this modification? To avoid potential damage to the barrel crown?
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Old 11-20-2019, 12:06 AM
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Quote:
Originally Posted by Mnlefty View Post
I would be interested in how you located rear hole and size. Iíve often though that it could be done. Would appreciate your info. Thanks
I'm a retired machinist so this kind of thing is easy for me.

Have you used your calipers for depth measurements?

With the barreled action out of the stock, you need the scope base mounted on the receiver for a flat working surface.
1. Depth measure (just in front of the base) from the top of the base to the top center of the receiver. Hold the calibers square.
2. Move down to depth measure from the top of the receiver to the top of the barrel.
3. Measure the diameter of the barrel at that spot and divide by two.
Add the three numbers together and lock your calipers at that dimension.

Flip the receiver upside down and lay the scope base flat on a table.
You can slide the lower of the "inside" caliper jaws along the table and move the receiver up to them so the top jaw scratches a mark.
Measure the width of the receiver and divide by two. Set the calipers to that, lay the receiver on its' side and mark the same way.
Center punch and drill, I use a 1/4" bit, carefully keeping the drill in line with the bore.

Reads much more complicated than it is and .001 precision really isn't necessary.
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Old 11-20-2019, 09:36 AM
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OK, this has gone far enough...Closed thread.
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