An easier way to cut carb base gaskets

I've had to make a few gaskets for small engines over the last few months. To make nice round holes for bolts I've used empty steel 7.62 x39 cases. I run my chamber tool on the outside and inside of the case a few times then whack with a hammer.
Cuts holes nicely in gasket material and a good use of old steel empties from the AK.