They can be used on 45 acp in a pinch. Just load towards the minimum charge as the primers a little hotter. I use the Winchester primers when I can find them for Standard and Magnum loads. Says both right on the box. I think they’re a little hotter than the CCI
Look it up on YouTube there’s a few videos on using magnum and rifle primers in handgun loads. Use what ya got when ya can’t find what you need. Just down load a little.
Never used magnum primers reloading 45ACP but there's plenty of feedback on 1911 forums from those who have and don't notice any difference.
I've used small pistol primers reloading 45ACP. A guy at the club was shooting some type of Winchester factory ammo with small pistol brass. I picked up what he shot (about 200) and reloaded with CCI small pistol 500 and W231. No difference in velocities. Shot just fine but I figured they'd somehow get mixed with my regular brass so I tossed 'em.
45ACP is relatively low pressure. Unless ya double charge it's hard to screw up real bad.