Well, I just finished my 4th batch of 1k rounds (.40 S&W). As usual, before I get started on reloading what I have, I double check the published reload data, do a little online searching for info, go over my notes from the last batch, and spend an hour or so verifying everything on my progressive press like primer seat, powder charge, COL, and crimp.
This round I found some info on reloading my .40 about what powder (burn rate) is best. The first & second time I went economical (lowest charge) to stretch my powder out, the third time I used what I could get (during the component shortage crisis - #5 IIRC), and this last time I went cheap again since it seemed to work.
The article I found stated that a slower burn powder requiring a bit more of a charge is better (wish I had found that before I bought my powder).
This and the last batch were Accurate #2 @ 5.28gr, Wolf Primers, Precision Delta FMJ RN 180gr bullets, 1.135 COL. No chrono so I have no idea what velocity I am getting. Planning on buying one in the next few months.
I have been having accuracy issues that I thought were me (lack of sufficient range time) but may actually be my reloads.
I know I know how to be accurate (been able to keep 8" group @ 100m bench shooting, and 6" @ 30yd freestyle), and I know my gun is accurate. These were using my reloads but not sure of the powder at the time. Might have been #2 or #5
At what point/distance does the powder charge & burn rate start to significantly impact handgun accuracy?
If you are reloading .40 with FMJ 180gr in an effort to match your SD carry rounds as far as felt recoil, I would really love to hear your recipe. I know a lot of people load cheap and light but carry hot and heavy (READ - practice and compete using low gr. bullets/loads, carry high gr. SD rounds)
NOTE- The bolded items are the answers I am seeking, the rest is my usual dribble that I spew when posting.