Every deer ive shot has been with Excalibur bolt cutters each one has killed and given a great bloodtrail, cant go wrong with them. 150g is going to give more penetration which is great, dont need to worry about more speed with xbow there fast enough.
I would never use mechanicals, too many what iffs. IMO mechanical are for people shooting compound bows that cant or too lazy to broadhead tune.
For a xbow theres no argument for not using fixed blade just sight in where broadheads are patterning and youre set.
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