Help with my first mod

[HatterMaster]

Okay so I know my idea and how to execute it, but to make sure scaling is right I need a mod resource for a anti material rifle magazine that can be loaded into blender 3D so I can scale my gun to the size of the bullets. Alternatively if someone can just give me what size it'll register at in 3D software because my whole gun relies on this, since I can use a tweaked 44. animation or at least get someone to tweak it for me. Its not to complicated a mod and the 3 load barrel has been done before with the RHINO gun, so it'll use very similar animation, except a swing cylinder instead of a crack action, so like I said it should be possible just to change the 44.'s animation looks to fit perfectly.