Originally Posted by trueblue
Thanks to everyone for taking the time to respond. Since I will be shooting the heavier bullets out of this rifle I will be looking at the 300RUM, as JE CUSTOM recomended. I also liked the comments made concerning the 300 Jarrett having to operate at higher pressures with less powder to get the same velocities as the 300 RUM. Something I didn't know. Very good info from all, and well appreciated. One question though concerning the comment made by JE CUSTOM on case design.
How does case design give you more consistant burn rate and does the angle of the shoulder come into play ? Maybe should ask this question on a new thread, but ....
I will try to explain it the best I can .
The case design can have an effect on burn rate and pressure curve consistency buy
directing pressure waves back towards the geographic center of the case causing a
more uniform burn of all the powder.
A strait sided case tends to blow all of the powder forward, A steep shouldered case
like the 6mm ppc and the ackley improved cartriges tend to redirect the pressure and
flame front back producing a more complete burn before exiting.
This is the reason for the short fat cases with 40o or more of sholder.
The benchrest guy's can probably explain it better than I have but thats the jest of
J E CUSTOM