Mystic Precision
CGN Ultra frequent flyer
- Location
- Summerland, BC
Velocities can also be misleading. I used to think this as the golden solution.
Apparently, a simple change in primers can lead to very spicy pressures WITHOUT changing speeds. This was tested and reported in an older Handloader mag and they did use pressure/strain gauge gear.
I was very surprised. SO when the manual says, no substitution of parts, they actually mean it.
Now once we have a change in component lots, all this goes out the window so.....
I still use velocity as a guide. At least, that is more then likely to tell the truth about my pressures.
Speaking of indestructible brass, one brand is touting how strong their stuff is leading shooters to suggest loading OVER 70,000psi as SAFE.
WOW, a disaster in the making. Proof pressure loads are around 75 to 85,000psi. Each commercial action must be test fired and survive this once, BUT at this pressure, the metal in the action in strained leading to greatly reduced service life.
a steady diet of proof pressure ammo is going to drop safe action life from hundreds of thousands to 10's or maybe just a few thousand rds. Once the steel passes its elastic limits, you got a bomb waiting to fragment.
The brass company forgot to mention the above.
There is no free lunch in internal ballistics. If someone is able to report performance significantly better then all the reloading manuals and millions of rds tested by the factories, you might want to run the other way....
YMMV
Jerry
Apparently, a simple change in primers can lead to very spicy pressures WITHOUT changing speeds. This was tested and reported in an older Handloader mag and they did use pressure/strain gauge gear.
I was very surprised. SO when the manual says, no substitution of parts, they actually mean it.
Now once we have a change in component lots, all this goes out the window so.....
I still use velocity as a guide. At least, that is more then likely to tell the truth about my pressures.
Speaking of indestructible brass, one brand is touting how strong their stuff is leading shooters to suggest loading OVER 70,000psi as SAFE.
WOW, a disaster in the making. Proof pressure loads are around 75 to 85,000psi. Each commercial action must be test fired and survive this once, BUT at this pressure, the metal in the action in strained leading to greatly reduced service life.
a steady diet of proof pressure ammo is going to drop safe action life from hundreds of thousands to 10's or maybe just a few thousand rds. Once the steel passes its elastic limits, you got a bomb waiting to fragment.
The brass company forgot to mention the above.
There is no free lunch in internal ballistics. If someone is able to report performance significantly better then all the reloading manuals and millions of rds tested by the factories, you might want to run the other way....
YMMV
Jerry
