They work extremely well in any unthroated 1911. I load mine to 1.230 OAL. Since the slugs have no shoulder so common in most 200grn. .45 cal. lead auto bullets they slide right into the pipe with ease. Have loaded them with about any and all powders for use in a .45 ACP and accuracy has been above average. Plenty good for any of the action shooting sports. Oregon Trail's have been stellar performers for me.