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Discussion in 'Reloading' started by tlk, May 18, 2009.
Is there an optimal speed or speeds for .308 bullets?
There are (more times than not) optimum velocities for any given bullet. Much of this depends on barrel twist. Also as with most other things, most bullets perform better when they arent "hot rodded".
Also each bullet is its own...as in some can be pushed hard and others not.
It depends on they're makeup.
For terminal performance, yes. The construction and velocity at impact are major determinants. The same is applicable for other calibers.
What does optimal mean? Accuracy? External ballistics? Terminal ballistics?
There are a lot differently designed bullets designed for differnt purposes and applications. If we are talking Long Range Hunting, you want a high BC bullet that will give good terminal performance down range. For LR... basically, the faster the better, assuming accuracy is acceptable.
Optimal means " The accepted best practice or performance for the situation involved "
External ballistics is the science of what happens to a bullet from exiting the barrel to just before it hits a target or the ground.
Internal ballistics is the science of what happens inside the cartridge case and the barrel during firing.
Terminal ballistics is the science of what happens when a bullet strikes a target .
A high BC will aid good External ballistics not Terminal ballistics.
Optimal Terminal ballistics is aided by correct bullet construction for the intended target and the final impact velocity .
If you do a web search on "Secrets of the Houston Warehouse"
It will help you to know what to chase and what didn't matter much.
It was more for bench rest type shooting but a good read!
Secrets of the Houston Warehouse by Virgil King was very interesting read .
However when you boil it all down there is nothing really ground breaking in it.
It mainly deals with finding the true accuracy potential of a gun by removing the wind factor.
It does confirm the accuracy improvement of neck turning and tight neck and fitted neck chambers.
That was pretty much known back then but not as widely as now .
It did confirm that a fitted neck with no clearance at all would produce one hole groups in his gun .
Thats the little secret Virgil talks about but never actually says that.
He mentions that he finds this secret out at the end by using a small piece of fine emery paper but does not say anymore.
The secret was that he used the emery paper to polish the case necks in a lathe so they just squeezed into the gun with a bullet seated.
It is not a practical way to load ammunition and only an experiment to show that neck concentricity and bullet concentricity in the chamber is very important.