leadchucker
Member
I'm trying to work up a load, and I was looking at the data in two of my load manuals. Both manuals provide load data for the exact same bullet, at the exact same OL, but the powder charges differ significantly.
I'm looking at a 40 S&W 165 gr. bullet. The bullet used in both manuals is a Speer TMJ FN, Speer part # 4410. The OL in both manuals is 1.120".
The Lyman #49 manual, page 363, says that the maximum charge weight for Winchester 231 is 5.8 gr, for 1050 fps, and the suggested start charge is 5.2 gr.
The Speer #14 manual, page 918, says that the maximum charge weight for Winchester 231 is 6.3 gr, for 1031 fps, and the suggested start charge is 5.8 gr.
The start charge in the Speer manual is the same as the MAX charge in the Lyman manual. I realize that different primers, different cases, maybe minor barrel differences, etc., could cause variations, but this much?
If it helps here's what I'm trying to find a decent load for:
40 S&W Precision Delta 165 gr. FMJ FP, Winchester 231, Winchester WSP primers. S&W Shield.
I'm looking at a 40 S&W 165 gr. bullet. The bullet used in both manuals is a Speer TMJ FN, Speer part # 4410. The OL in both manuals is 1.120".
The Lyman #49 manual, page 363, says that the maximum charge weight for Winchester 231 is 5.8 gr, for 1050 fps, and the suggested start charge is 5.2 gr.
The Speer #14 manual, page 918, says that the maximum charge weight for Winchester 231 is 6.3 gr, for 1031 fps, and the suggested start charge is 5.8 gr.
The start charge in the Speer manual is the same as the MAX charge in the Lyman manual. I realize that different primers, different cases, maybe minor barrel differences, etc., could cause variations, but this much?
If it helps here's what I'm trying to find a decent load for:
40 S&W Precision Delta 165 gr. FMJ FP, Winchester 231, Winchester WSP primers. S&W Shield.