tlc,
I surprised no one has asked for a clarification, I cannot find any info about a 355Magnum.

I can guess; however, assuming is not a good idea. It does make a difference. How much if any you lead would depend on whether we are talking pistol velocities (1300fps) or beefed up magnum velocity (3000fps).

Please check again, what is the cartridge the firearm is chambered for: 357mag? 35 Whelen? 350 Magnum? It the difference between the tortise and the hare.

EKM