Looks like a 30-06 Ackley. Remind me of what the parent cartridge is? I love wildcats but I need to better select my applications. Necking, trimming, forming, and neck turning 500 cases to shoot ground squirrels with is a lot of work.
The parent case is a 3006. I've tried 270s and 8x57 but the 3006 is the easiest. The cartridge is based off of a lengthened 300 savage. It is a 30 degree shoulder 30 cal at 2.25 length.
To make the case I simply run a 3006 thru a 300 savage die and push the shoulder back to where it needs to be and trim it to 2.25. The 20 I made last night I trimmed a little short but they have to be fireformed so It should stretch out a little!