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on saturday, i shot over the chrony.

here's my results; with bushmaster dissipator[16"] all [5] shot strings

pmp[south african] 55gr. ball

a.v.2975fps
extreme spread 92.26
standard deviation 41.89

m-855[ss109] 1999mf.
a.v.2902
e.s93.75
s.d 35.35

with d.r.200[k-2] [18" tube]
pmp
av 3016
e.s34.99
s.d.15.55

m-855[ss109]
a.v.2942
e.s54.63
s.d. 20.56
so you can see that 2" of barrel [longer] equated only 40 fps more.
[if it is an 18" barrel, it's kinda tough to measure with the psudo flash suppressor on it]
the d.r.200 shot the best with the 55gr. .223remington[i always knew there was a reason i liked humping/shooting VARMINTS with it]


thanks.

i did run a 90gr. projo in.270 winchester[ruger#1 sporter]
the first read was 3223fps, then #2 shot 'spun' the little chrony and threw it into error, i fired two more and they both clocked 3099fps
i was on tuef's board blowing off about this loading ,as i couldn't recall where it printed at 100 yards, i recall now! it's DEAD-NUTS ON[no scope adjustments required :dunce: ]
 
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