Trouble with Bulletflight Iphone comeups

[kustomkoatings]

Yesterday I was working on my dope for my .338, and I wasn't able to get Bulletflight to give me the right numbers. @ 800. Could someone look over my info and tell me what I might be missing.

.338 LM 300 grain SMK @ 2830fps Zeroed @ 300 yards
85 deg
Baro 29.92
Elev 400ft
Wind 2mph from 11 oclock
Cosine 0

I was zeroed @ 300 yards and bullet flight called for 14 MOA up @ 792 yards and I was way over the plate I ended up with only needing 11.25 MOA . I had the same problem back in June in South Dakota shooting @ 947 I could not go from 600 yards up to 947 yards. If I used what Bulletflight called for I would be several minutes high. I have tried to fudge the numbers in every possible way but nothing adds up. I and 100 % positive that my muzzle velocity is right, I entered bullet bc with bullet database. I have played with the b.c. to try and get it right and nothing seems to get me close. I really need to get this figured out before I head back to South Dakota next month for muley season.

 

[nddodd]

My g5 drag model called for 12 min at 790 and the g1 model called for 14.

I've had better luck with the g5 model.


Nathan

 

[albert]

the bc in the bullet flight data base isn't always right. I believe that they use published bc's. compare with others and check. I have had better luck using a g7 bc. I have had good results using the bc's in brian litz's book.

 

[mo]

I had to adjust my velocity in my program. My rifle shoots around 2875 to 2900 I finally settled on 3150 fps in the ballistic program. I shot rifle at 500 600 700 800 yds and everything was dead on.

 

[RMulhern]

Totally amazing!!