16" AR question???

what are the average diferances in drop and velocity out at say 300 and 400 yds,,,,i like to shoot some prarie dog towns as well so imight want the longer barrel for the extended range, noise is and aint a factor, i dont want somthing thats going to be extreamly loud but a gun shot is a gunshot so i dont think it will matter. i seen some of you said you ware hearing protection while hunting, im going to start a new thread asking about hearing protection because i have some seperate questions about that.
 
Velocity loss depends on the load. With fast burning powders like 4198 with light bullets 30-40gr.about 70-80 fps. diff. between my 20" last time I chrony'd when working up loads with 30gr. Bergers and 40 VMax's.

Probably 150fps or so with 50-55gr. loads. I've been shooting the little Bergers since they came out. There nice for Chuck's inside of 250yds.and do very well with 1-9 twist.
 


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