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Joined: Jun 2020
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To know the exact measurement of the chambers in a quick and easy way, without tools, there is a way that I imagine many of you know.

We need a stick, a wax candle and a ruler. We will make the measurement in one of the two chambers, if the shotgun is SxS or O/Y. First of all, we will make a block with newspaper and we will put it in the barrel at a distance of about 10 cm from the extractor. This will act as a stop for the wax.

The first thing to do is to place the barrel vertically with the breeches facing upwards. Tape both barrels, leaving a gap in which to test. Optionally, the inside of the barrel can be lightly oiled.

[Linked Image from i.ibb.co]

Fill the barrel with wax.
[Linked Image from i.ibb.co]

Wait for it to cool and solidify.
[Linked Image from i.ibb.co]

Cut it so that it is level.
[Linked Image from i.ibb.co]
[Linked Image from i.ibb.co]

With the help of a stick and through the front barrel, we will remove the wax candle with small blows.

Measure the length of the chamber.
[Linked Image from i.ibb.co]

This is the chamber length of my W&C Scott & Son, that surprise me with 70 mm!

PD: Sorry for my bad english and regards!


28 ga, hammerguns and all shotguns and rifles made by hands.
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campero, I love it. Never thought of using candle wax. But I think it would be a little tricky on the floor of a gun show with a gun I have not yet bought.

I'll post a photo of my solution, though it has a few more coats of finish to go and it needs to be cut from the stock yet. Marks are for 2", 2.5", 2.75" and 3". The shoulder is 3.5".

The idea for this came from a photo texted to me, by another member here. Many thanks for that.

[Linked Image from i.imgur.com]

Last edited by BrentD, Prof; 03/08/23 04:41 PM.

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Originally Posted by Karl Graebner
KY Jon - Brent,
I've been in same boat since the disappearance of RST shells and the like. Kent shots hells had some 2 1/2" available, but with only 3/4 oz. of shot. I've recently scored a bunch of Fiocchi and Rio 2 3/4 " shells loaded with 7/8 oz. shot at 1200 fps. I've shot them in my 2 1/2 " chambered Churchill with great results. The hulls show no harm at all to the ends, and they feel better than the RST's did. Perhaps just reloading the shortest 2 3/4 " measured shell to the 20 gauge equivalent would work. I have to admit, I haven't missed the 1 oz. that I normally shot.
Hope this helps,
Karl

Karl, I have 1 flat left of those same RIO loads. They are really nice to shoot and I don't suffer any damage to my scores either.

I have been reloading near equivalents of that load as well using American Select powder and some others. I'll be adapting that to the 2" gun, if and when I find one.


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Crude, but it works for me

[Linked Image from live.staticflickr.com]Gauge by FGP1154, on Flickr

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Originally Posted by BrentD, Prof
Originally Posted by Karl Graebner
KY Jon - Brent,
I've been in same boat since the disappearance of RST shells and the like. Kent shots hells had some 2 1/2" available, but with only 3/4 oz. of shot. I've recently scored a bunch of Fiocchi and Rio 2 3/4 " shells loaded with 7/8 oz. shot at 1200 fps. I've shot them in my 2 1/2 " chambered Churchill with great results. The hulls show no harm at all to the ends, and they feel better than the RST's did. Perhaps just reloading the shortest 2 3/4 " measured shell to the 20 gauge equivalent would work. I have to admit, I haven't missed the 1 oz. that I normally shot.
Hope this helps,
Karl

Karl, I have 1 flat left of those same RIO loads. They are really nice to shoot and I don't suffer any damage to my scores either.

I have been reloading near equivalents of that load as well using American Select powder and some others. I'll be adapting that to the 2" gun, if and when I find one.

Brent,
Loaded as such, the pressure feels low and the ends of the hulls in 2 1/2 " guns have no burns/splits or damage what so ever. I suspect that the shot string is improved as well. The solution for your proposed 2" gun would be quite different I'm sure.
Karl

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Brent, your solution is great and very usefull but hard to do for all gauges. Mine is easy and it show how is the chamber and the first part of barrel, but as you said is not for do in a gun show.

Regards!


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Edd how would you check the barrel for the 30,,90 measurement at a gun show .??????????

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A very easy way to check chamber length on any shotgun is to use a index card, roll it lengthwise and insert it in the chamber and let it conform to the chamber size. Then gently slide it until it stops, mark it and try it again. Works every time and is simple to do anyplace.

Jon, years ago I only shot 20 gauge and started reloading for skeet. I used only Winchester AA compression formed 2 3/4" hulls. They all seemed to be consistent in length. I shot them out of a Winchester 101. Since then I have not reloaded any 20's but still have components to do so, but again they are 2 3/4". Since I started shooting and collecting doubles, mostly L.C. Smiths, the chambers for 20 gauge until sometime in the middle 1930's was 2 1/2", after that they went to 2 3/4". So I cannot say anything about loading short 2 1/2" 20 gauge, however I do reload 2 1/2" 16 gauge. The chambers for 16 gauge L.C. Smith's until late 1939-40 were 2 9/16" chambers. I use a Mec 600 Jr. and use a 1/4" spacer under the 3-5 stations to raise the hull for powder/shot, start crimp and final crimp. I use mostly Cheddite hulls, some Federals and a few black Remingtons cut to 2 1/2" .
From all the shooting you do you probably use a progressive machine like the Mec 9000. Not sure how short 20's are done in that.


David


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Originally Posted by David Williamson
A very easy way to check chamber length on any shotgun is to use a index card, roll it lengthwise and insert it in the chamber and let it conform to the chamber size. Then gently slide it until it stops, mark it and try it again. Works every time and is simple to do anyplace.
.

Brilliant!


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KY Jon Offline OP
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Well I now have about 3,600 Remington 20 gauge hulls that are at or under 67mm. Measured and sorted. I adjusted my Spolar loader last night and loaded 800 with 7/8 ounce shot, 8,000 Psi, 1150 fps. I was more interested in keeping the pressure under 8,000 than getting velocity up to 1,200 fps. I have used this load in the past and know it patterns beautifully. All with standard wads and powder on hand. If the weather hold Sunday I’m going to shoot these in my 20 bore, 2 1/2” Pape hammer gun.

I am a happy fellow. Next up will be finding a 12 gauge equivalent hull and load. Goal will be 1 ounce, 67mm, with pressure under 7,500, maybe 6,500 for Summertime use and anything around 1100-1150fps. Again it has to be with common available wads and powder on hand. I know I could just load 2 3/4” and most likely never worry about shooting them in my guns, but 67mm in a “65”mm chamber is easier to accomplish than I thought. I have 5,000 Fiocchi and 3,000 B&P hulls to start with. I might just load up a couple loads and have them tested if I can’t find a listed load. But I think there are plenty to pick from, between the two. If not, I still have Remington, AA, Federal paper and Federal plastic to look at.

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