G1 vs G7 ??? Am I crazy 6.5 PRC

[Sierra Hunter]

I’m using the g7 as the input for BC, but the data I’m getting back makes me think I’m missing something. Am I really only getting reliable bullets expansion at 1,800 fps to 475 yds? Please help me learn here.

 

[BearGuy]

G1 is .625 on that round.

 

[deerhunter628]

The .315 is the G7

 

[Sierra Hunter]

But shouldn’t I be using the G7? Of .315?

 

[BearGuy]

You have G1 selected on your app as the drag function not G7

 

[deerhunter628]

But shouldn’t I be using the G7? Of .315?

Yes, but you are using G1.

 

[Sierra Hunter]

You guys caught the issue. Thank you

 

[8nbait]

.315 is very optimistic, you may need to lower that a little as your target distance increases

 

[wind gypsy]

.315 is very optimistic, you may need to lower that a little as your target distance increases

This. Their mach 2.25 BC is for distances where BC is a much smaller factor. Applied Ballistics' measured BC aligns with Hornady's mach 1.75 BC (0.294).