Velocity vs Powder Charge GRAPHS

[DoctorBill]

I have been thinking of doing various powder charges (with filler) and
Chronographing the velocities I obtain in order to see what kind of
GRAPH I get.

Being a Chemist, I am used to looking for relationships in graphical form
and wondered if one gets a nice line or curve with varying powder
charges with everything else held constant.

Well - I found an example while surfing reloading information:

http://www.mynetimages.com/77fb1a084b.jpg

Nice !

Interesting how all the powders there, except one, have much the
same slope to them.

I also wonder if the use of a filler would change the slope of any one
particular line ? i.e. the line with and without filler - how would the line change?

I am sure many, many of you could do this same thing with data you
have already accumulated building up your experimental loads !

Gives one a feel for what to expect with any particular powder...

Does anyone know where we might find more of this kind of data ?

I want to do this for my Fav'es (when I find them).

DoctorBill

[MtGun44]

I have plotted many different cartridges when I don't have any loading data for a
particular powder. I take a rollover or other deviation from approximately straight
line as a sign to stop going higher, and that the powder is either vecoming inefficient
(rolloff) or spiking the pressure (curving upward).

For an unknown powder (milsurp, usually) I start WAY low with two loads, plot and
then extrapolate upwards a 'reasonable' amount and then test that one and add it
to the plot. Slowly working upward as long as the slope stays reasonable.

Bill

[Larry Gibson]

Doc

The only thing you'll find with the filler (depending on type of filler) is that given equal loads the velocities will move to the right,I.E. the velocities will be higher.

Larry Gibson

[TCLouis]

Could/would yo republish that with about 1/2 the data on each graph.
It get too jumbled to discern any useful info in that one area.

[DoctorBill]

As I said in the post, TCLouis, that is not my graph but from the site shown on
the graph itself.

http://www.gmdr.com/lever/lowveldata.htm
click on
30-30 Ackley Improved
170gr RNFPnn

All the data is there if you scroll down....

I do not have a graphing program to regraph that data, unless I used MS's "Excel" program
...and I'm too tired right now to try to relearn the use of it.

I do want to generate some of that type of data myself, however.

DoctorBill