RE: muzzy 3 vs 4 blade
I used to use 4 blade 90 grn muzzys and have never had a problem wih them!
Although I have heard that 4 blades will not penetrate as well as 3 or 2 blade heads??
I really dont think you will gain anything from switching to a 4 blade from the 3 blade, I also dont think it will hurt you any as well??
Unless you are getting a good deal on the heads I would not bother with the switch but thats just my OPINION??