Ditto on never having had to trim .45 ACP. Seems like the long out of print NRA book, "Handloading" had a good discussion on uniform head space and its effect on accuracy in the .45 ACP. Rod
Our Flag does not fly because the wind blows against it,
It proudly waves because a soldier's dying breath blows upon it.
USAF Forward Air Controller, 5th Spl Forces,
An Loc, lll Corps, RVN, 69-70, Vietnam Vet '69-'73