I am attempting to eliminate the leading and sometime tumbling that we get in my daughters Browning Hi Power. The current mold that I use is a Lee 356-124 RF, which drops a finished bullet at .357 to .358.
The barrel slugs at a little over .358.
I use a charge of W-231 anywhere from 3.8 to 4.2 grains, with a COL of 1.115.
With that bullet and COL it gives me a seating depth of .228.
I am considering the use of a Lee 358-125 RF bullet (I already have the mold) which drop at .358- .359. In order to get the cartridge to head space properly it is necessary to set the bullet at a COL of 1.015, which gives me a seating depth of .278.
I am looking for some advise on starting charges of W-231 with a bullet seated to that depth.
I hope that I have explained my problem properly.
It would be nice if loading manuals gave the dimensions of bullets.