Some thoughts on Pressure Tracing.........
Jan 19, 2017 23:09:20 GMT -5
linebaugh, dennis, and 1 more like this
Post by Richard on Jan 19, 2017 23:09:20 GMT -5
First of all, I want to thank Jerry for taking on this huge endeavor!
What I hope I don't see is people inquiring as to what load is safe in their barrel? Jerry does not make the barrels and I doubt he can say for a fact what load or what pressure is safe. The PT shows what pressure is produced with his load in his barrel at whatever pressure his bullet goes down and how hard he seats it. 60,000 psi in my barrel which is 1.250" over the chamber area could be very safe but in your skinny tube, it might be marginal? We see CF rifles like those magnums produced by Weatherby and others with listed pressure for their loads in the 65K range and these are very often fairly thin sendero type barrels. I believe most of the barrels we are using for conversions, even the thinner ones, with easily hold 65K! The big problem is "Double Charging!"===========been there and done that. The load that bulged my 1.250 Brux barrel was PT't by TG at around 53K. But I had loaded an additional charge of 72 gr. (total duplex) plus another 300 gr. bullet. That meant 672 gr. of bullet/powder which crossed my chronograph at 3485 fps. Way, way more pressure than what was shown blowing up those muzzle loaders in the video. (on the other thread) The result? my barrel expanded .024" in the area just ahead of the where the first bullet seated. NO disaster as that phony video showed.
It is nice to know what pressures are generated but for the most part, that number is not what blows a barrel...................its the double charge which Scat cannot reproduce. And were I Jerry, I would never tell anyone what load is safe in their rifle!...................................Simply show what the pressure was on his gun with his load and leave it up to the viewer to decide if he/she wants to shoot it in their rifle. Just be aware that it IS the double charge that will get you in trouble and that, Jerry has no control over. We must all be responsible for our own actions and accept the consequences. The PT is ONLY a rough guide.
What I hope I don't see is people inquiring as to what load is safe in their barrel? Jerry does not make the barrels and I doubt he can say for a fact what load or what pressure is safe. The PT shows what pressure is produced with his load in his barrel at whatever pressure his bullet goes down and how hard he seats it. 60,000 psi in my barrel which is 1.250" over the chamber area could be very safe but in your skinny tube, it might be marginal? We see CF rifles like those magnums produced by Weatherby and others with listed pressure for their loads in the 65K range and these are very often fairly thin sendero type barrels. I believe most of the barrels we are using for conversions, even the thinner ones, with easily hold 65K! The big problem is "Double Charging!"===========been there and done that. The load that bulged my 1.250 Brux barrel was PT't by TG at around 53K. But I had loaded an additional charge of 72 gr. (total duplex) plus another 300 gr. bullet. That meant 672 gr. of bullet/powder which crossed my chronograph at 3485 fps. Way, way more pressure than what was shown blowing up those muzzle loaders in the video. (on the other thread) The result? my barrel expanded .024" in the area just ahead of the where the first bullet seated. NO disaster as that phony video showed.
It is nice to know what pressures are generated but for the most part, that number is not what blows a barrel...................its the double charge which Scat cannot reproduce. And were I Jerry, I would never tell anyone what load is safe in their rifle!...................................Simply show what the pressure was on his gun with his load and leave it up to the viewer to decide if he/she wants to shoot it in their rifle. Just be aware that it IS the double charge that will get you in trouble and that, Jerry has no control over. We must all be responsible for our own actions and accept the consequences. The PT is ONLY a rough guide.
So EVERYONE can be safer when they pull the trigger....