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Joined: Feb 2008
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Sidelock
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Can someone please tell me which is correct?

Double shotguns have a swamp in the barrels. Meaning there is a very slight curve down the barrel from the breach to about mid length. Then there is a slight curve upwards to the muzzles.

If you measure the drop at comb and at heel with a long precison straight edge that contacts the rib at the muzzles - not resting on the top of the bead, you will get a certain measurement for the drop at comb and at heel.

But if you use a shorter straight edge that only extends to the mid point of the rib on the barrels. You will get different measurements for drops at the combs and at heel. The measurements might be as much as 1/4 inch MORE at the heel.

I assume the long straight edge method is proper? Thanx.

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Sidelock
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NE - you assume correctly. The drop measure is from "line of sight." An easy way is to lay the shotgun upside down on a large, flat table and measure up from the table top to the stock.

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Also make sure the front bead is hanging off the edge of the table so you don't get a false measurement

CJ


The taste of poor quality lingers long after the cheap price is forgotten.........
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If the gun has a mid-bead, just prop the front and rear of the rib on a pair of wood blocks, measure from the comb and heel to the table surface, and subtract the thickness of the blocks.

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Is line of sight at the base of the front bead or over the top?

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Sidelock
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I've always used the base of the bead/rib surface for the front and the rib surface at the reciever.

I've seen some ribs below the barrels at the muzzles, so laying it on a table would not give an accurate account of that type.

Also, I have checked my dinner table and breakfast nook table for flatness. Only certain parts of them are acceptably flat for measuring a gun for drop. It's amazing how curved some table surfaces are. Frankly, I like using a straightedge to get a good reading.

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And once we've determined these numbers to our satisfaction, what do they mean?


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Do you like talking in riddles?

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I would say the these drop measuring procedures would be correct, but you said in your first post that there is a slight curve upward to the muzzles. Someone might want to correct me if I am wrong, but not all barrels bend upward. If I remember correctly, the Model 21s made prior to 1960 had a slight downward bend which made them shoot "dead on". This was changed in 1960. I don't know how many other makes were made in this manner other than the 21s. But I think the earlier 21s were.

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Mike,
Msasurments like this are useful in comparative assessments by us in determining whether or not a gun will shoot well for a given shooter with known positive experience with a set of dimensions. However, there are some variables that the basic drop/LOP/cast don't account for. Granted, they are more subtle than the big basic dimensions above. But you knew all this.

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