Brent
Well-Known Member
I`m shooting a 416wby in a Ruger mag. Scope is a Leopold 3.5x10x40 I`m using 400gn Barnes XLC`s over 115gns of RL22 and GM215M primers w/ oal 3.755". Velocity is 2550 producing .300"-.700" groups verses 1.7" at 2650 fps.
Advertised BC is .546 and at 2550 fps bullets hit as follows.
2.25 moa at 200
5.25 moa at 300
9.00 moa at 400
14.00 moa at 500 this is where things deviate
19.25 moa at 600
24.50 moa at 700
31.75 moa at 800 was 15" low still ( 3 shots )
The chart goes like this (JBM and LOAD FROM A DISK programs )
2.31 moa at 200 yds
5.39 moa at 300
8.94 moa at 400
12.89 moa at 500
17.30 moa at 600
22.20 moa at 700
27.65 moa at 800
33.69 moa at 900
40.44 moa at 1000
If I change the velocity to 2450 or something lower like that to coinside with the 500 to 1000yd moa end that puts my 100 to 500yd shots high on the target.
So after 150 dollers on two boxes of bullets and 1.75lbs of powder I have an accurate chart for this bullet, etc. but am left wondering what variable would cause this.
Is the BC changing around 400yds because of velocity dropping, and if so do the programs account for this? If I change the BC to .350 after 500yds the table falls real close to mine.
Any insights on this before I go back to 1000yds?
Advertised BC is .546 and at 2550 fps bullets hit as follows.
2.25 moa at 200
5.25 moa at 300
9.00 moa at 400
14.00 moa at 500 this is where things deviate
19.25 moa at 600
24.50 moa at 700
31.75 moa at 800 was 15" low still ( 3 shots )
The chart goes like this (JBM and LOAD FROM A DISK programs )
2.31 moa at 200 yds
5.39 moa at 300
8.94 moa at 400
12.89 moa at 500
17.30 moa at 600
22.20 moa at 700
27.65 moa at 800
33.69 moa at 900
40.44 moa at 1000
If I change the velocity to 2450 or something lower like that to coinside with the 500 to 1000yd moa end that puts my 100 to 500yd shots high on the target.
So after 150 dollers on two boxes of bullets and 1.75lbs of powder I have an accurate chart for this bullet, etc. but am left wondering what variable would cause this.
Is the BC changing around 400yds because of velocity dropping, and if so do the programs account for this? If I change the BC to .350 after 500yds the table falls real close to mine.
Any insights on this before I go back to 1000yds?