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Post by Kyle on Jan 1, 2017 19:27:10 GMT -5
FOR INFORMATIONAL PURPOSES ONLY.
I have been doing some research on stainless steel and the pressures exerted on them relative to their bore and outside diameter. As one would expect, given the same bore diameter the amount of pressure a barrel can tolerate increases with greater outside diameter.
The formula that I have found to calculate an ESTIMATE of the pressure needed to BULGE a 416 stainless barrel is: 2 x 110000(yield strength) x (wall thickness in inches) / outside diameter in inches
The formula that I have found to calculate an ESTIMATE of the pressure needed to RUPTURE a 416 stainless barrel is: 2 x 135000(ultimate tensile strength) x (wall thickness in inches) / outside diameter in inches
If the BULGE formula is applied to a .450 cal barrel with an O.D. of 1.00", the following calculation is made: 2 x 110000 x .275" / 1.00" = 60,500 psi
If the RUPTURE formula is applied to a .450 cal barrel with an O.D. of 1.00", the following calculation is made: 2 x 135000 x .275" / 1.00" = 74,250 psi
One could take it even further and use the groove diameter to be on the side of caution even further. The strength of the action, primer and ignition system would also come into play for the shooter to consider. What is the limit on pressure for your gun? That is only for you and/or your manufacturer to decide. For me, I'm going to stay way off of the pressure needed to bulge a barrel! AGAIN THIS IS FOR INFORMATIONAL PURPOSES ONLY. BE SAFE IN EVERYTHING YOU DO WITH YOUR SMOKELESS MUZZLELOADER. |
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Post by Deleted on Jan 1, 2017 19:53:54 GMT -5
Excellent info. Thank you
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Post by dennis on Jan 1, 2017 19:54:46 GMT -5
Thanks for the information Kyle I for one am trying to stay safe. I have bulged a barrel,(my error) and had a cartridge failure in a 7mm mag that ruined a rifle. I am thankful that neither incident caused me harm. It is great that you and others take the time to research the safety factors for the rest of us.I for one am grateful.
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Post by kai on Jan 1, 2017 19:58:35 GMT -5
Kyle, That's interesting.
Thanks for sharing this info.
If the barrel has been chambered for a cartridge such as 45-70 the chambered section of the barrel might be thinner and weaker than the rifled section of the barrel.
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Post by longrange on Jan 1, 2017 20:34:53 GMT -5
Good info
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Post by buckdoehunter on Jan 1, 2017 21:53:24 GMT -5
Good info., I would have guessed the pressure to bulge/rupture a barrel to be higher.
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Post by Kyle on Jan 1, 2017 22:01:36 GMT -5
Good info., I would have guessed the pressure to bulge/rupture a barrel to be higher. Bulge / Rupture pressure is not an absolute number. It varies with each barrel. |
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Post by Deleted on Jan 1, 2017 22:20:29 GMT -5
So a double load is Bad accident 100%.... Go custom sml barreled gun or not at all is the safe way imo.....
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Post by elkman1310 on Jan 1, 2017 22:53:08 GMT -5
One thing you can do to increase your margin of safety is use a Chrome moly barrel. 416 does not have near the tensile strength of 4140 chrome moly. I have used both and a good chrome moly will not rust if you take reasonable care of it and wipe it down once in a great will. I have chrome moly barrels that were only polished that are 30 years old and they still look good.
If you check with some of the barrel makes they will tell you not to use a thin S/S barrel on a center fire in below zero temp's because they will fail so much for S/S
Bottom line is keep loads below 50K and you will be fine! A extra 100 feet of velocity always come at a price.
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Post by Richard on Jan 1, 2017 23:29:54 GMT -5
Another 100 fps is only a click or two away!  |
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Post by markb317 on Jan 2, 2017 1:11:48 GMT -5
Great information, thanks Kyle for taking the time to research this for the guys on the board.
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Post by speedrackin on Jan 2, 2017 7:02:30 GMT -5
Kyle great job .... Not only do u build a awesome bullet but you show your compassion for the sport to help keep us all safe !
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