45 Super Brass in a 1911?

Would probably need to reduce your load somewhat to account for the lower case volume. How much to reduce is the question.

.45 super case walls are thicker iir correctly.

No problem as long as you adjust your powder volume to compensate for the thicker brass. When times were hard (I was poor) I cut off range pick-up .30-06 and .308 to make 45 ACP. The case walls are thicker on those, too.

Problem would be seating the bullet. Unless you inside neck turn or use an undersized bullet.

jski said:

Any problems with extraction?

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None that I remember. It might require a slight extractor adjustment due to the small difference in rim diameter, but there are fairly wide variances even in 45ACP cases, so that's not really a big deal.

Atavar said:

.45 super case walls are thicker iir correctly.

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Starline says the web is thicker, not the upper case walls. They also use a different brass formula and heat treating. This has been my experience, I’ve been shooting/loading .45 super for a long time.

Bullets for both .45 ACP and .45 Super are the same diameter and finished load external case diameters are the same as .45 ACP loads using .45 ACP dies.

They also say internal case volume is “similar”. This is where I would reduce a bit to play it safe.

https://www.starlinebrass.com/45-super-brass

Other than the headstamps, the loads will be dimensionally similar on the outside. To be double sure you’re all good, lower the charge by 10 pct and work up to your desired .45 ACP load.

Stay safe.