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Post by jfscott on Jan 29, 2013 21:34:45 GMT -5
I have a 24v 223/20 and when I fire the 223 barrel the action opens. I can see a slight swelling of the fired cases too. Cannot see any noticable part damage, and all surfaces are clean. Any ideas?
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Post by cas on Jan 30, 2013 0:51:04 GMT -5
You obviously have a lock up issue you need to have looked at by someone who knows break action shotguns.
Curious are you shooting .223 or 5.56?
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Post by jfscott on Feb 1, 2013 18:43:44 GMT -5
Have used both .223 & 5.56. also reloads with military brass. Only breaks open with rifle barrel, not shotgun.
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Post by cas on Feb 2, 2013 17:49:16 GMT -5
Well the rifle rounds are a lot more pressure, and higher up on the frame so the geometry/leverage is different. Probably a simple fix for someone who knows what they're doing…. of course the trick is finding that person.  |
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Post by jfscott on Feb 2, 2013 18:22:59 GMT -5
Always thought this would be the best survivalist gun. Rifle(22lr insert option), and shotgun with shot or slugs. Guess i'll stick with my trusty mini-14 if it comes to that! Thanks for the input.
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Post by oldfotoman on Feb 13, 2013 15:48:59 GMT -5
Could be any of several things. First off you should pay close attention to when it does this and what ammo you're using. If it only does it using 5.56 or reloads, it may be a pressure issue caused by the wrong ammo. 5.56 has about 5,000 psi more pressure than most223s. It also uses a longer lead in the barrel chamber, so using 5.56 in a 223 chamber can raise the pressure by an extra 15,000 psi. If you reload 5.56 mil brass, you must be aware that it is thicker brass than 223, reducing the inside case measurements, so you need to reduce 223 loading data by about 10% to begin with. Most modern guns are chambered in between 223 and 5.56 becuase manufacturers figure someone may use them interchangably. If it doesn't have this trouble using actual223 ammo, then your ammo loads and pressure may be the problem.
However, since you say you also have some swelling in the cases, your chamber may be cut wrong. You need to have it checked for tolerances if all of the rifle cases swell.
Lastly, you may simply have a lock up issue, probably caused by wear on the locking mechanism. Especially possible if this is an older gun that has been use quite a bit.
Could also be a combination of some of these things. As cas points out, the rounds are in the top barrel and the combination of the added pressure and the higher leverage point may be causing an issue not seen with the shotgun barrel.
The case swelling would bother me the most because that would indicate to me that the chamber was not within specs. Unless it's swelling because it's backing out when the lock up loosens, either diameter, length, or shoulder angle almost has to be wrong. You could try clamping or some other method to make sure the lock up stays in position and then firing some regular 223 rounds. If they don't swell when the lock up stays in place, then your chambers are probably within spec, and I'd look at the other possibilities.
Hope this gives you a couple of ideas to look for and is some help.
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Post by sisterjim on Mar 24, 2013 11:29:15 GMT -5
I had this problem when pushing the boundaries with cast bullets in a 30-30/20. I would be careful to start low and build up in small increments when developing loads. The action locks at the bottom but the top barrel creates the most pressure. I keep my full house loads for the Merkel.
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