Interesting experiment with a word of caution
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Interesting experiment with a word of caution


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Old 08-09-2015, 08:30 PM   #1
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Default Interesting experiment with a word of caution

I have a Thompson Contender with a bunch of different barrels. One of the barrels is a 45 Colt/410 Shotgun. When shooting 45 Colt it is not very accurate because the bullet has to jump a big gap before it reaches the rifling. That is obviously because the 410 is a much longer case. Well I have been thinking of a way to make an extra long case to use with my 45 Colt loads. I have tried a few cases without success. But I was in a pawn shop the other day and saw a ziplock bag with 10 long cases in it. Out of curiosity I picked it up to take a look. 460 S&W!!!!!! I bought the bag for $2.00 just to play around with it. When I resized the case it slid right into the chamber of my Contender. So I loaded up 10 rounds of 250 grain bullets with magnum primers and 6.5 grains of Titegroup. That is a very low pressure load for a Contender. My Hodgdon book shows a starting load of 8.0 for a 240 grain bullet. So I have no doubt this will be safe. I hope to get to the range to test it out later today. But I thought I would post this as a word of caution to anyone that owns a Judge or a Governor. I was able to chamber a 460 Smith & Wesson in the chamber similar to what you have. I would be concerned that if someone inexperienced were to be with you while at the range had access to a 460 S&W round they could easily blow up your gun. Here are a couple of photos just for a comparison.
File Type: jpg DSC01347.jpg (38.1 KB, 54 views)
File Type: jpg DSC01350.jpg (42.6 KB, 52 views)
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Old 08-09-2015, 08:38 PM   #2
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Waiting for your report sir!
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Old 08-09-2015, 09:04 PM   #3
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Why would it matter what happens before the bullet enters the barrel? Wouldn't the rifling stabilize it?
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Old 08-09-2015, 09:40 PM   #4
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There is such a difference in lenght that the bullet can get all the way out of the case and engage the rifling slightly canted and causing a slight wobble. Typically in my reloads the bullet is just a few thousands from engaging this gives it a chance to start moving before it encounters resistance.
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Old 08-09-2015, 10:09 PM   #5
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Are .38s in a .357 less accurate?
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Old 08-09-2015, 10:25 PM   #6
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I'd think it will be less accurate at a distance, because of the lower velocity. Long time ago Nagant closed the cylinder gap entirely, and that didn't do much. That said, hooray to Rick for doing real research, and I hope he beats us critics
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Old 08-09-2015, 11:06 PM   #7
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IMO, you're taking a chance.

If a load is not listed in a manual with a particular case, it's not a good idea to use it. Factories have expensive pressure-testing equipment that you don't have access to, so the safety of a load can't be verified.

The powder charge is not the only factor in pressure. Some fast-burning powders (like Titegroup) can detonate instead of burn when there is too much air space in the case. That can cause a pressure spike that can destroy the gun (as well as your hands & eyes). Not worth it.

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Old 08-09-2015, 11:20 PM   #8
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Titegroup was made for use in large cases with a lot of unused volume. That is why coyboy action shooters use it.
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Old 08-09-2015, 11:21 PM   #9
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Pasquanel I could not have said it better myself.
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Old 08-09-2015, 11:24 PM   #10
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You are probably right about less velocity Mercater. But I don't want to start with anything higher until i test it. The Contender can handle much higher velocities. But I am going to start out easy.
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