fnbrowning
Member
After a pause in reloading for a many months, I reintroduced myself by reviewing data on loads for my favorite calibers. I came across the new Hodgdon Powder Burn Rate Chart and, ***! the positions of some favorite powders have changed!
Looking at a Hodgdon Powder Burn Rate Chart not more than 3 years old, W-748 is listed faster than Varget. Varget and AA-2520 are neighbors, and are faster than Reloder 15.
Now, AA-2520 is listed faster than any of the powders I've mentioned! Reloder 15 is faster than W-748?? IMR 4320 is now between former neighbors Varget and W-748!
What has happened?? Is there been a change in the science of powder burning test methods, or have the majors mixed up new chemistries?
For instance, that 24-month old canister of W-748 in my workshop - - was it always faster than AA-2520 & Reloder 15, or was it always slower, being the previous burn rate data was wrong
Or, or, is that 24-month old canister of W-748 now an obsolete chemistry that will cause myself (and all the data publishers like Sierra & Lyman) to have to retest all the shooting data because new batches of W-748 is a slower powder now
Looking at a Hodgdon Powder Burn Rate Chart not more than 3 years old, W-748 is listed faster than Varget. Varget and AA-2520 are neighbors, and are faster than Reloder 15.
Now, AA-2520 is listed faster than any of the powders I've mentioned! Reloder 15 is faster than W-748?? IMR 4320 is now between former neighbors Varget and W-748!
What has happened?? Is there been a change in the science of powder burning test methods, or have the majors mixed up new chemistries?
For instance, that 24-month old canister of W-748 in my workshop - - was it always faster than AA-2520 & Reloder 15, or was it always slower, being the previous burn rate data was wrong
Or, or, is that 24-month old canister of W-748 now an obsolete chemistry that will cause myself (and all the data publishers like Sierra & Lyman) to have to retest all the shooting data because new batches of W-748 is a slower powder now