Impact MK3 slugs?

Matthew, you are correct in your readings of conflicting information. Plenty of it, but, there is good information as well. Your M3 has some "basic" settings that FX sends them out of the factory shooting a "standard pellet weight at a general +-FPS". FX publishes these settings and we can always go back to the benchmark and start over. That being said, why not shoot some slugs that are the same weight as the factory published pellet FPS weight? Never know until you try 😁 Your liner, your "factory tune", your slug...All make a difference in Your M3! No "Magic dust Tune" compared with my M3 tune that will necessarily work in your M3. Start where you are , not where I am.
As always, have fun.

Patrick
 
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