Long range ballistics guru's???

[bowpro12]

Adjust your BC. Also, assuming you are shooting the same direction for all ranges. If you are shooting east on the 1000yd and west for the 800, coriolis can be this far off.

Bingo!

[Randy]

Adjust your BC. Also, assuming you are shooting the same direction for all ranges. If you are shooting east on the 1000yd and west for the 800, coriolis can be this far off.

Right here.

A lot of times the published bc isn't what the real world number turns out to be.

[bboswell]

Right here.

A lot of times the published bc isn't what the real world number turns out to be.

I have seen this and adjusted for it before but it always showed up sooner versus being on at multiple ranges and then just falling out.

I will keep playing with it and see.

Thanks

[Mike D]

24.3
37.1 actual (36.1 per chart)

My values come up a little different. What elevation are you shooting at? These are at 1650' ASL.




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[Scoobyh]

Dumb question, but I'm assuming hand loads?
What powder? And what time of year were they worked up?

I think you are fighting a transonic issue, it starts having affects around 1340FPS.

http://www.accurateshooter.com/ballistics/transonic-effects-on-bullet-stability-bc/

.248 G7 B.C
2660 FPS
This is close as I could get.

Scott

[bboswell]

Long range ballistics guru's???

Dumb question, but I'm assuming hand loads?

What powder? And what time of year were they worked up?



I think you are fighting a transonic issue, it starts having affects around 1340FPS.

http://www.accurateshooter.com/ballistics/transonic-effects-on-bullet-stability-bc/

.248 G7 B.C

2660 FPS

This is close as I could get.



Scott

That pretty much nailed it!

But doesn't match what mine calculates with same info in my weather.

Luckily we will get out there in time for some dope trueing prior to the shoot.



Thanks

[bboswell]

My values come up a little different. What elevation are you shooting at? These are at 1650' ASL.




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381' elevation here. Headed to 7500' to shoot

[Roosterpt1]

It's your BC. With loss in velocity you need to build a BC chart for your dope. That bullet does funny stuff at transonic and loses near all accuracy at subsonic. I consider .308 a great cartridge inside 700 beyond that yes you can hit targets but not with absolute consistency and accuracy. This is where the rise in popularity of the .260 6.5 creed and 6mm stuff comes into play. Higher velocity, higher BC and maintain supersonic speeds at greater distances. Build a bc chart for your extended ranges and reverse engineer what you know your dope is. I try and help this weekend if your there Friday.

[bboswell]

It's your BC. With loss in velocity you need to build a BC chart for your dope. That bullet does funny stuff at transonic and loses near all accuracy at subsonic. I consider .308 a great cartridge inside 700 beyond that yes you can hit targets but not with absolute consistency and accuracy. This is where the rise in popularity of the .260 6.5 creed and 6mm stuff comes into play. Higher velocity, higher BC and maintain supersonic speeds at greater distances. Build a bc chart for your extended ranges and reverse engineer what you know your dope is. I try and help this weekend if your there Friday.

This rifle will be in ladies & youth so hopefully it won't need to go past 750ish. We will be there Thurs.

[meltingfeather]

What would you do?

If it's a repeated pattern correct my dope chart and keep shooting.
Unless you're getting subsonic (likely at that range), in which case your ability to predict the behavior is going to fall off quickly.

[stxhunter]

Long range ballistics guru's???

This is as close as I could get 24.3 at 800 and 37.1 at 1000 . Starting velocity of 2680




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[Zen Archery]

apps get you close real world scenario gets you closer. Correct data in your hard data book and you're good to go.