Lyman 454424 Crimp Location...

[mehavey]

For the last 40 years I've been crimping my 45 Colt into the (apparent) crimp
groove of Lyman's 454424 bullet -- which gives me an OAL of 1.660" -- far longer
than the listed 1.575" in the manual

Tonight I read the actual fine print in my older Lyman's 3rd Cast Handbook that
I'm supposed to ignore the crimp groove and "... crimp on the foward edge of
the first driving band."

What gives here? (and does it make any real difference?)

[Nick_C_S]

I'm not an expert in 45 Colt. But speaking generically, I think you're just fine as long as long as the cylinder is free to rotate and the round is performing consistently.

I would have never given it a second thought either, and crimped it in the crimp groove; just like you did.

Hmm, crimping in the crimp grove <-- seems logical to me.

[dahermit]

For the last 40 years I've been crimping my 45 Colt into the (apparent) crimp
groove of Lyman's 454424 bullet -- which gives me an OAL of 1.660" -- far longer
than the listed 1.575" in the manual
Tonight I read the actual fine print in my older Lyman's 3rd Cast Handbook that
I'm supposed to ignore the crimp groove and "... crimp on the foward edge of
the first driving band."
What gives here? (and does it make any real difference?)

The Lyman 3rd is just keeping within the maximum (1.600), specified O.A.L. for the .45 Colt. When SAMMI determined the max O.A.L. for the .45 Colt, the .45 bullets of the day were much shorter and Elmer Keith had not been invented yet. They (Lyman) has to follow SAMMI specifications, whether or not current practices such as using the crimp groove is safe or not.
As the previous post stated, if your cylinder still turns, I do not see that there is any problem with what you are doing.