OK here is where I was wrong, yes pressure is the factor to back thrust. But what increases pressure is a combination of things. Powder charge and or bullet weight. It is when people try to push heavy bullet at higher velocities, do they get the higher pressure therefor causing higher back thrust. You have to have a projectile in the case to produce pressure. It takes more pressure to propel a heavier bullet forward than it does a lighter bullet.

There are reasons people that develop cartridges use certain bullet weights. It aids in keeping the pressures of the case to where in will operate properly and safely in there intended gun. It is when someone wants to increase bullet weight, than the pressures can spike and destroy a gun.

Tell me this, who actually knows what pressure they are using in there guns if they reload? I don't know one guy here that has the tools to measure the pressure they are developing. Do you know of any?

If you load bullets that are heaver then intended for a gun, what do you use to tell you, you are in a safe operating pressure and not above it.

Also tell me what changes the case pressure, more powder, heavier bullets. Also even a primer can change the pressure in a case.

http://www.jamescalhoon.com/primers_and_pressure.php

quote:

Originally posted by Redhawk1: I don't know one guy here that has the tools to measure the pressure they are developing. Do you know of any?

My Oehler Model 43 PBL measures pressure via strain gauge.

So now you know one.

quote:

Originally posted by onefunzr2:

quote:

Originally posted by Redhawk1: I don't know one guy here that has the tools to measure the pressure they are developing. Do you know of any?

My Oehler Model 43 PBL measures pressure via strain gauge.

So now you know one.

Yep, now I know one..

When I open the loading gate, my empties fall out and primers are normal. Why do I need to know more? I load for accuracy, not velocity.
I load my .44 from 240 to 330 gr boolits and they all seem to fall from the chambers, all are accurate and all fired brass looks and measures the same.
Funny that my .475 with 350 to 460 gr boolits does the same thing.
Proper loading procedures seems to keep all pressures in safe limits.
Going to a heavier boolit demands a lower powder charge and even though velocity is lower, pressure remains the same.
I don't understand where you are going Redhawk? Back pressure on the recoil plate of a revolver is far less important then on bolt lugs of a high power rifle. Consider that modern revolvers can take more pressure then a lot of rifles.

quote:

Originally posted by bfrshooter:
When I open the loading gate, my empties fall out and primers are normal. Why do I need to know more? I load for accuracy, not velocity.
I load my .44 from 240 to 330 gr boolits and they all seem to fall from the chambers, all are accurate and all fired brass looks and measures the same.
Funny that my .475 with 350 to 460 gr boolits does the same thing.
Proper loading procedures seems to keep all pressures in safe limits.
Going to a heavier boolit demands a lower powder charge and even though velocity is lower, pressure remains the same.
I don't understand where you are going Redhawk? Back pressure on the recoil plate of a revolver is far less important then on bolt lugs of a high power rifle. Consider that modern revolvers can take more pressure then a lot of rifles.

You may load and stay in a safe range as I do. But we both know, there is a lot of guys out there that like to push there guns to the max. Those's are the guys I refer to. I also go for accuracy over velocity. I use published loads that I know are safe in my guns.
If you don't understand where I am going with this, and it does not affect you, don't worry about it. I am not going to go into more detail. The above explains it well enough.

Redhawk,

I do not believe I have ever posted or suggested anyone use a load above posted max in a published manual. One of the reasons I use chronographs is to check consistency between lots of powder, bullets or primers. IMR 4350 was pulled from the market years ago because of extreme differences between lots.

I have no reason to firewall any of my revolvers. If I need more than it can safely produce, I just pick up a larger caliber.