Validation issue with 6.5 CM and 143 ELD-X

Lpart

Well-Known Member
Joined
Jun 28, 2010
Messages
339
Location
Powell, Wyoming
I was out yesterday helping a friend pull data together for his 6.5 CM in a Ruger Precision Rifle. Using the 143 ELD-X and 42.1 gr H4350. Labradar gave me a velocity of 2650 with SD about 10. Applied Ballistics gave me a come up of 13.5 moa with a 100 yd zero. We then set up a target at 600 yards and shot a 5 shot group with this come up. Group was at 1 moa but 20 inches high. I had to adjust the velocity all the way up to 2994 to get the correct solution. I have never had such a large adjustment before (I usually only need an adjustment of 50fps or less when doing this). Can you see any reason for this result? My own 6.5 CM with a 24" Barlein #4 comes in at a validated 2800 fps.
 

An Idahoan

Well-Known Member
Joined
Mar 26, 2016
Messages
82
Location
Boise, Idaho
I don't want to insult you, but is the distance between the optical axis and line of departure (bore) entered correctly? Applied Ballistics has a default that must be changed to each setup.
 

Lpart

Well-Known Member
Joined
Jun 28, 2010
Messages
339
Location
Powell, Wyoming
I believe so. He has a 56mm scope and has very high rings. I measured it at 2.5 inches and did put that into the program.
 

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