I just took a quick look at some of my records for IMR-7383…
I had chronographed 4 different loads that I stay with using this powder…
My lot, LOT # RAD78L 47985, is slower than IMR-4064…
I used QL to attempt to determine which powder was closer to the actual burn rate of my IMR-7383 and got the following results…
6.8 SPC…~Reloder 17
30-30 Winchester…~CFE-223 or AA-2230
7-30 WATERS…~Reloder 17
308 WINCHESTER…~H-4350
I shot the charge of IMR-7383 over the chronograph and then used QL to determine what burn rate it would be by inputting IMR-4064 numbers into the QL and then adjusted the burning rate factor to get the actual velocity that my chrony recorded.
Example: 30 grains of IMR-7383 gave the same velocity as 30 grains of H4350 in the 308 Winchester. I did try that and the velocities were close enough to say it slower than the IMR-4064 recommended to start with. The other ones were verified except the 30-30 Winchester load as I had no CFE-223 at that time—years ago…
As I previously mentioned, this powder’s burn rate seems to be cartridge based. I did try it in the 270, but I shot one round and I pulled the bullets on the other few—I didn’t like what I heard, the primer, smoke for about 10 feet in front of the barrel, and just a “gut feeling”…
The results above were done with only one weight bullet/boolit per cartridge. Other weights might make much more of a difference in burning rate. Too tedious and time consumer for me to even care about that, due to the limited use I have for it…
Good-luck…BCB