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Rifles, Reloading, Optics, Equipment
Gunsmithing
Muzzle break threading 300 win mag
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<blockquote data-quote="J E Custom" data-source="post: 1312463" data-attributes="member: 2736"><p>I hear everything you are saying and agree that these things do exist. as far as the pressure at the muzzle of a rifle or pistol It is normally somewhere between 10,000 to 17,000 psi at the muzzle,</p><p></p><p>Chamber pressure is much higher and this is where the SAMMI pressure specification is set. on revolvers it is normally lower because of the gas loss between the cylinder and the barrel. Most revolvers fail at the cylinder from the max pressure. The fluted cylinders normally have the flutes between the cylinder bores so as not to weaken the cylinder. Most shotguns fail just in front of the receiver where there is no extra support. Rifles generally fail near the muzzle (About 2/3 rds from the action and continue to the muzzle. If the barrel splits soon enough and can relieve most of the pressure,</p><p>a muzzle device can sometimes stop the barrel from splitting all the way, but often as not it just shoots the brake off if the barrel wall is two thin.</p><p></p><p>Here is a link to some barrel failures that proves that it does happen and can be prevented.</p><p></p><p><a href="https://www.google.com/search?q=rifle+barrel+failures&tbm=isch&imgil=QinRpilg-jdB2M%253A%253B_dct8E1d-E9kNM%253Bhttp%25253A%25252F%25252Fwww.wideopenspaces.com%25252Fgood-guns-go-boom-catastrophic-gun-failures%25252F&source=iu&pf=m&fir=QinRpilg-jdB2M%253A%252C_dct8E1d-E9kNM%252C_&usg=__c6_Rr82aAA5PVh9qAgYmyB3joE8%3D&biw=1120&bih=567&ved=0ahUKEwiSgdGgxfjTAhVIOSYKHZ_jAbMQyjcIOw&ei=ZhodWZK2FcjymAGfx4eYCw#imgrc=yQ5P6r7G5K3djM:&spf=1495079543300" target="_blank">https://www.google.com/search?q=rifle+barrel+failures&tbm=isch&imgil=QinRpilg-jdB2M%3A%3B_dct8E1d-E9kNM%3Bhttp%253A%252F%252Fwww.wideopenspaces.com%252Fgood-guns-go-boom-catastrophic-gun-failures%252F&source=iu&pf=m&fir=QinRpilg-jdB2M%3A%2C_dct8E1d-E9kNM%2C_&usg=__c6_Rr82aAA5PVh9qAgYmyB3joE8=&biw=1120&bih=567&ved=0ahUKEwiSgdGgxfjTAhVIOSYKHZ_jAbMQyjcIOw&ei=ZhodWZK2FcjymAGfx4eYCw#imgrc=yQ5P6r7G5K3djM:&spf=1495079543300</a></p><p></p><p>I was worried about wall thickness when I found a rifle that had a bulge in the bore of only .004 to .006 thousandths about 8'' from the muzzle. You could not see it but while cleaning it you could feel the patch get loose and then tight again. It was a fluted barrel that the flutes were two deep and did/could not support the pressure. I replaced the barrel with a non fluted barrel and later decided to cross section the barrel, the web between the bottom of the flutes and the bore was less that .100 thousandths. (Of course the pressure would be higher at this point but the failure occurred anyway.</p><p></p><p>I have seen many of these failures but never had one of my weapons fail except for the one mentioned, and I considered it was caused by a very bad fluting job and for many years I would not own a fluted barrel because of it. Once I talked to the favorite barrel maker he convinced me that proper fluting was not the problem but poor fluting and not enough wall thickness. (This is why most barrel makers will not flute or warranty fluting on a barrel below a certain contour because of the wall thickness issue.</p><p></p><p>I am probably to conservative but It has served me well and I don't want to be one of those shooters in the link that found out the hard way. or find out that some of the work that I performed failed and possibly hurt someone. </p><p></p><p>Over the years I have declined to do something that I though was marginal because of my concern</p><p>with it and to date have a 100% clean record from failures, and will stick with my philosophy. Why take a chance, Murphy is always out there and ready to pounce.</p><p></p><p>Just My Opinion</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1312463, member: 2736"] I hear everything you are saying and agree that these things do exist. as far as the pressure at the muzzle of a rifle or pistol It is normally somewhere between 10,000 to 17,000 psi at the muzzle, Chamber pressure is much higher and this is where the SAMMI pressure specification is set. on revolvers it is normally lower because of the gas loss between the cylinder and the barrel. Most revolvers fail at the cylinder from the max pressure. The fluted cylinders normally have the flutes between the cylinder bores so as not to weaken the cylinder. Most shotguns fail just in front of the receiver where there is no extra support. Rifles generally fail near the muzzle (About 2/3 rds from the action and continue to the muzzle. If the barrel splits soon enough and can relieve most of the pressure, a muzzle device can sometimes stop the barrel from splitting all the way, but often as not it just shoots the brake off if the barrel wall is two thin. Here is a link to some barrel failures that proves that it does happen and can be prevented. [url]https://www.google.com/search?q=rifle+barrel+failures&tbm=isch&imgil=QinRpilg-jdB2M%253A%253B_dct8E1d-E9kNM%253Bhttp%25253A%25252F%25252Fwww.wideopenspaces.com%25252Fgood-guns-go-boom-catastrophic-gun-failures%25252F&source=iu&pf=m&fir=QinRpilg-jdB2M%253A%252C_dct8E1d-E9kNM%252C_&usg=__c6_Rr82aAA5PVh9qAgYmyB3joE8%3D&biw=1120&bih=567&ved=0ahUKEwiSgdGgxfjTAhVIOSYKHZ_jAbMQyjcIOw&ei=ZhodWZK2FcjymAGfx4eYCw#imgrc=yQ5P6r7G5K3djM:&spf=1495079543300[/url] I was worried about wall thickness when I found a rifle that had a bulge in the bore of only .004 to .006 thousandths about 8'' from the muzzle. You could not see it but while cleaning it you could feel the patch get loose and then tight again. It was a fluted barrel that the flutes were two deep and did/could not support the pressure. I replaced the barrel with a non fluted barrel and later decided to cross section the barrel, the web between the bottom of the flutes and the bore was less that .100 thousandths. (Of course the pressure would be higher at this point but the failure occurred anyway. I have seen many of these failures but never had one of my weapons fail except for the one mentioned, and I considered it was caused by a very bad fluting job and for many years I would not own a fluted barrel because of it. Once I talked to the favorite barrel maker he convinced me that proper fluting was not the problem but poor fluting and not enough wall thickness. (This is why most barrel makers will not flute or warranty fluting on a barrel below a certain contour because of the wall thickness issue. I am probably to conservative but It has served me well and I don't want to be one of those shooters in the link that found out the hard way. or find out that some of the work that I performed failed and possibly hurt someone. Over the years I have declined to do something that I though was marginal because of my concern with it and to date have a 100% clean record from failures, and will stick with my philosophy. Why take a chance, Murphy is always out there and ready to pounce. Just My Opinion J E CUSTOM [/QUOTE]
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Muzzle break threading 300 win mag
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