accubond BC ?'s

[Ridge Runner]

changed the scope on my 7mm AM this week, now my shooting is 800 yds or less, and it seems it has always shot high using the 160 accubonds, by about 1/4 MOA. so today I shot at 630 yds, 44 degrees, 29.5 BP, this load chrony'd 3430 fps a week ago in simular temps. so today I shoot 3 shots and shot 1 was 2 moa high, I contributed this to a cold bore shot, now the next 2 were just under 1 moa high. so my ? is, have any of you ran the numbers on a nosler 160 accubond to find out what actual BC it is, if I change the BC in my programs from the published # of .531, to .620, then my chart comes very close to matching my trajectory. thanks for any input
RR

 

[AJ Peacock]

What kind of Chrono? Maybe you have a higher velocity as well? You might need to tweak velocity and BC to make the curve exactly fit your rifle.

AJ

 

[Ridge Runner]

I use a pact professional, will try a cold bore shot and check that.
RR