will I have to trim after each time the case is fired?
I know the 45acp is no comparison to the 30/06 but I have not had to trim the 45acp yet.
.45 acp. . . I've never had to trim one, yet. Never.
.30-'06. . . Usually, every other time, to after the third time loaded, I'll trim them. I load in 'batches'. If one batch needs trimming, I'll watch the others.
I have an old friend that used to load a near maximum charge of IMR 3031 in the '06, and he had to trim cases after ONE firing. (Rifle was a Remington pump. . . 760, I think.)
Well, he was preparing to go hunting and asked me to load him some of his 'favorite' loads. (He had to work O.T. and couldn't get his loads ready.)
When I read what he was charging the cases with, my only reaction was
He was 4 grains OVER maximum!!!!!
No wonder he was stretching the snot outta his cases!
I worked up a really accurate load for his rifle. One that was nowhere near maximum!!!!!!!
(BTW, he took an 8 pt whitetail at 125 yds, one shot, with my loads that I worked up for him. I'm kinda proud of that.) That buck dropped where he was hit.
Bottom line. . . I don't load for maximum velocities. I load for accuracy and to hit the sweet spot of around 2800 fps.
Trimming should be done when needed and probably not after every loading.
IHTH.