Calibrated Ballistics Turret is NOT Matching POI

[waveslayer]

How does a person calculate the BC?

I'm not going to answer directly because it's a little mathematical and has been covered extensively by professionals. Do some research and you can get the formulas. Best is to take the inflated advertised BC's and adjust from there. BC's are becoming things of the past and now we are using Drag Coefficients from Doppler Radar. You match your bullet with these and they will get you out past the transonic range.

I guess I'm one of those guys that thinks I'm Tacticool.. I guess the old school Kentucky Windage is more accurate. If you can dial and can have more precision in your shooting that's a bad thing?... that's referring to someone's other lame post.

 

[Ingwe]

It sounds like you ordered a turret based off calculations? If that is the case that was your first mistake. That would be the equivalent of pulling a rifle out of the box and zeroing it then expecting to hit a game animal at 1000 yards. Yes it is possible but not guaranteed. You needed to validate data by shooting before ordering the turret.

I just entered all of the requested data on the Swarovski program

 

[Ingwe]

I'm not going to answer directly because it's a little mathematical and has been covered extensively by professionals. Do some research and you can get the formulas. Best is to take the inflated advertised BC's and adjust from there. BC's are becoming things of the past and now we are using Drag Coefficients from Doppler Radar. You match your bullet with these and they will get you out past the transonic range.



I guess I'm one of those guys that thinks I'm Tacticool.. I guess the old school Kentucky Windage is more accurate. If you can dial and can have more precision in your shooting that's a bad thing?... that's referring to someone's other lame post.

I would love to be able to sit down with a guy like you and try to understand this stuff.

Jokes aside, I think that the solution for hunting conditions is a bit of both unless you can sit at a distance and have the time to do your calculations/entries and take an un-rushed shot.

 

[waveslayer]

I would love to be able to sit down with a guy like you and try to understand this stuff.

Jokes aside, I think that the solution for hunting conditions is a bit of both unless you can sit at a distance and have the time to do your calculations/entries and take an un-rushed shot.

I hunt a lot and do a lot of long range shooting. If you know your rifle and trust your loads you will build confidence and know that you can take one shot one kill at moat distances... granted the wind is played right.

I use a Horus 59 Reticle or a variable of it. I know my point blank range, which most people should know when you are hunting. Then I know how Mils or MOA I need to hold 300 yards out... if the animal or target is past 600 or even 800... you will most likely have time to adjust turrets. Not many guys take shots off hand at those distances..

I would also invest in a good Tripod like Really Right Stuff, this way I can quickly remove my spotting scope and lock down my rifle and take a supported shot.

But back to knowing your rifle and Dope. I usually just hold overs from my reticles. This way if I spot my impacts and miss, I know how much to adjust because my reticle just told me. I can get a follow up shot off rather quickly.. hopefully it is enough to put down the animal before its 5 canyons over!

 

[RockyMtnMT]

bc will vary from rifle to rifle with the same bullet. This is why we must validate our drops before we take our app out hunting or order a ballistic turret.

An absolute dead nuts zero just also be established. This is critical to accurate drops at distance. Much of the error in this particular turret can be compensated for by zeroing at 500y and dialing backwards. Should keep the op in moa of deer.

There is a reason that Oehler is marketing a bc calculation system. It isn't for a few bullet makers like us.

 

[Swiftkill]

That is very correct!

 

[Crunchy]

Save yourself some heartache like last couple post state. Zero at four or five hundie toss turret on and run it.

 

[FURMAN]

Since we are on the topic and many will most likely read this custom turrets are not a great long range solution. You are far better off either getting a range finder like the ABS 2400 or BR2 or just using an app with a cheaper range finder. The turrets are only slightly better than a bdc reticle. Pressures change, temps change the turret WILL be off.

 

[Deleted member 8840]

Would you show what bullet you used and the fps and what sight in you used. There may not be anything wrong but the sight in. Maybe the info you sent in to have to turret made.

 

[Deleted member 8840]

Would you show what bullet you used and the fps and what sight in you used. There may not be anything wrong but the sight in. Maybe the info you sent in to have to turret made.

Also tell me the moa click at every 100 yard on the turret that was made.

 

[MarkA]

You still know nothing until you tall target test your scope. At 100 yards setup 36" or so tall target, shoot a shot with your 100 yard zero at near bottom of target then dial up at least 15 moa and shoot again with same point of aim measure the actual poi difference between the 2 shots.

If they don't measure near exactly 15.70 inches you have a dial problem with the scope itself. Use your original turret not the custom one. My guess is dialing more or higher per moa than 1.047 inches at 100 yards.

I personally use 20 moa dialup for scope testing which should measure 20.94 inches 21 inches is great!!

I draw a good plumb magic marker line up the target which can also tell you if scope is dialing straight up, if it does not dial straight the line then either the scope has an issue or your not mounted level and plumb above bore.

What ever you are "off" at a 100 yds exponentially will be 10 times that at 1K.

 

[waveslayer]

You still know nothing until you tall target test your scope. At 100 yards setup 36" or so tall target, shoot a shot with your 100 yard zero at near bottom of target then dial up at least 15 moa and shoot again with same point of aim measure the actual poi difference between the 2 shots.

If they don't measure near exactly 15.70 inches you have a dial problem with the scope itself. Use your original turret not the custom one. My guess is dialing more or higher per moa than 1.047 inches at 100 yards.

I personally use 20 moa dialup for scope testing which should measure 20.94 inches 21 inches is great!!

I draw a good plumb magic marker line up the target which can also tell you if scope is dialing straight up, if it does not dial straight the line then either the scope has an issue or your not mounted level and plumb above bore.

What ever you are "off" at a 100 yds exponentially will be 10 times that at 1K.

You don't need to shoot a tall target test.. you are implementing shooter error, ammo error etc..

All you need to do is dial the scope and test the tracking. Dial up and dial down, dial windage etc.. google search a tall target test and the instructions are pretty easy to follow. The hardest part is how much do you want to spend on a scope mount that won't move as you dial. Also ensure you are at exactly 100 yards or 100 meters.. if you shoot then you should do a Box Test

 

[Ingwe]

After reading all off these (excellent) posts and recommendations, I have been thinking that the simplist solution would be to "prove" my impacts at 100 yard increments, then make my own markings on the turret....what do you all think?

 

[waveslayer]

After reading all off these (excellent) posts and recommendations, I have been thinking that the simplist solution would be to "prove" my impacts at 100 yard increments, then make my own markings on the turret....what do you all think?

I think you are on the right path!!! Maybe use your old turrets? What scope is it again?