Though I do not recommend anyone doing this at home...
When a round is coming up from the magazine it is tilted slightly upward. It will come under the extractor as it rises. It will need space to straighten out as it goes forward.
First, the rim must fit between the extractor and the breech face. I made the side of the extractor (not the claw yet) angled to enhance this induction. I polished and rounded the approach angle and deepened the space in the claw to allow for variations of rims.
Next, the casing must come up past the claw’s lower edge and fall into the curvature in the extractor claw.
The claw on a .45 Storm is much shorter than that of a 9mm or .40. This is because the slide is cut out farther to house the .45. The 9mm & .40 are higher pressure rounds and need more breech face depth. This means that the extractor claws are longer, often too long in the wrong spot, if not manicured.
I created an induction curve and reduced the bottom protrusion of the claw and polished it. The top of the claw will space and retain the cartridge sufficiently, as will the center. By reducing the lower point of the curve and polishing it, friction and the need to overcome the spring are greatly reduced.
This made for smooth sailing for all cartridges of any brand. This also allows the strangely shaped bullet that occasionally comes up to have the space to readjust as it hits the top of the chamber.
I hope my explanation was not too confusing. It is a fine tune type of operation. Metal tempering was not affected.