Help with 3D modeling So I'm new to blender, but I've gone through the Blender Guru video series and did all that fun stuff.

So I've set out to make a mod for Fallout 4, but I've run into a couple of issues with my mod that I'm hoping someone here can help with.

So my goal is to overhaul all the bullets, cases, and cartridges with HD versions and so far it's going good, but there are a couple of aspects of my meshes I wish to improve on.

So first off, how would I go about making the type of crimp goorves seen in this bullet? I'll add a comparison of my high poly mesh as well for comparison. The crimp is very complicated and I'm not sure what method I could use to replicate it in my mesh.
Create a black and white Displacement Map in image editing software.



Add six Edge Loops CTRL+R. Then select the two inner Edge Loops and Scale them in press S and then SHFT+Z to keep them from moving on the "Z" axis.



Using Cycles create a new material and bring the Displacement Map in to the Image Texture Node (Set this to Non Color Data).



UV Unwrap your bullet using Cylinder Projection. Open your Displacement image then Scale and position the UV Map to fit the image.