I just changed calibres on my Fx impact M4 from a 700mm .25 to a .30 cal 700mm, i kept the same tune as i had when it was .25cal ( reg 160bar,macro 16,micro 4.25,valve 14mm) shooting 41g zans at 960fps and now that its in .30 cal its shooting .30 54gn H&Ns at over 1000fps and pretty consistant to, my question is this to fast?? Does the .30cal like to go slower? So far i havent managed to get out and see if it groups well.
Fx impact .30 cal velocity to high???
- Thread starter Redwolfpaul25
- Start date
That how I have my impact .30 setup it was originally a .35 cal. I use .30 NSA 54gn slug with just over 1100fps and very consistant.
tight group at 75 yards which is the length of my shhoting lane. Take it out, find out, and make a dope chart.
tight group at 75 yards which is the length of my shhoting lane. Take it out, find out, and make a dope chart.
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