Completed a 2 part tutorial series for my channel. Thought I’d share the final result. I made two images, with subtle differences. Would love to know which you like best.
Click on the images for better viewing.
Sweet, but the grooves are going the wrong way 
BTW I like the first one better.
Wow, I think you are right. The reference I was looking at was different form the ones I just saw now :0. Will get that fixed. Thank you for pointing that out!
Just for reference.
Note the sharpness on the case lip as well as the tight cut where the case bevels down to the extractor lip.
@Anthony C
Thanks! As for the case lip, I was having trouble getting it any sharper. Crease is at max, and putting it on flat shading shows faceting in the renders.
I’d use an inset on the bullet end of the casing to help sharpen that edge. the same can be done on the bottom when cutting in the primer pocket to help avoid the rippling a sub surf will add to the cylinder.
Ah inset! Thank you Anthony, very helpful!