Burris custom Turret

[DON]

I'm ordering a custom turret for my Burris C4 Scope as it was free with the deal.
Filling out the on line form there is an area that ask for altitude. I'm torn as what to put there as I live at 800 ft and normally hunt at 9500-10,000 ft. My gut tells me put the altitude I hunt at.

Can anyone enlighten me here? HELP!!!!!

Don

 

[SJB358]

I'd do it where you hunt at if it were me. Either way you'll have to verify it Don, so really it's six and one/half dozen.

 

[JD338]

Call Burris and ask them.
I live at 1500' and had my CDS dials set at 3000'. Not any real difference out to 800 yds that I shoot out to.
You could run your ballistics in the JBM program and compare the altitude differences.

JD338

 

[DON]

Thanks JD,
I will try that with JBM.

Don

 

[DON]

Called Burris,
They suggested I go with the elevation I hunt in when ordering the custom turret. Makes sense.
Anyway that's resolved, now just waiting till it arrives.

Thanks JD,

Don

 

[wildgene]

...a lot of little things go into your "Altitude Density", cold air is denser, higher el. is less dense, etc. The larger change in el. is probably going to be the biggest factor, & still not much of a change out to 500yds. Go high el., true your data for the extra drop @ your home el.

 

[DON]

Wildgene,
Thanks that"s good information.

Don

 

[Guns & Glass]

Worked out concept data on 'BDC Reticle Error Range' since many shooters (optics reps included) struggle with how they work and how easily POA & POI can coincide. But not ready to publish yet till it's final review of how easily read and understood.

Seen big movement back to good old fashion shooting style I call "clicker shooting" thanks to comPHEWters, and custom turrets, so sticking with your application.

Don, no mention of your cartridge, but here's some data based just on "clicking" aka dialing in shots used one factory load and standard Defaults to help you 'dial in'.

Cartridge: 30-06
Bullet: Nosler Partition 165 gr.
Barrel: 24"
Scope: 1.5" average 40mm
Muzzle Velocity: 2830 FPS
Temp: 59* F
Xwind: 10 MPH Xwind
Elevation: 800' & 9500'
Zero: 100 & 200 yds.

100 yd. Zero @ 500yds
800'........9500'
-55"........-49" 6" difference

200 yd. Zero @ 500 yds.
800'......9500'
-49"......-46" 3" difference

These are mathematical figures, but as you can see, there are enough differences that can account for a miss, or a poorly placed shot that none of us ever want.

There's another factor seldom brought into the 'complete shooting equation' and it's a hard one. Wind, and I don't mean 'breaking wind'.

At 100 or 200 yard Zero it remains the same, butT at different Elevations......
800' it's.....22"
9500' it's................15"

Combine the deviations of both Elevation, and Windage so you have accurate bullet placement which is a medley of actions all working together in harmony to produce, "Happy Bullet Holes".

 

[wildgene]

...well contrary to magazine writers, flashy advertisements, & 'popular belief' there ain't no such critter as 'dial & shoot'. 29* @ 9500' instead of 59* would make the difference in drop 1" instead of 3", about the same w/ a 50fps. change in MV...

...the CDS is a 'Baseline' calculated from the specifics you give. You still need to understand the ballistics of your rifle/ ammo & the effects of 'Altitude Density' on your shot under current conditions. The strong point is it's a lot quicker & easier to dial '500yds.' directly, then add/ subtract 1-2 clicks to match the ground conditions than to count 33-34 clicks under hunting conditions. You still have to shoot 'em, you still have to verify your loads, you still need to understand the effects of temp, humidity, elev, et al, but the dials will get you on target very quickly...

 

[DON]

Well,
Just received the custom turret from Burris on Saturday. Had it in 1-week. Amazing :shock:
Anyway, I will get it installed soon then set out for the range to give her a check out session.

More later,
Don

 

[DrMike]

That is a good turn around, Don. It will be interesting to see your assessment of this turret. Everyone is getting into the act with turrets.

 

[DON]

Dr. Mike,
Got the turret installed, cleaned the gun and went to the range to double check everything at 100 yards. It's printing at 2.5 " high at that range. I will get to a different area very soon to check it at 300 and 400 yards.

Don

 

[OldMan]

The C4 does not have a zero stop so you can get a turn off if you aren't careful! What i did was take off the dial and found a M.O.A. dial under it. Got a windage cap from Burris and it screws on like a regular cap. When i need to dial, I just remove the cap and use the M.O.A. dial. If they would have put a zero stop on it things would be good as the damn things seem to track well. Leupold went the extra mile on their VX6 with not only a stop, but a lock on the dial! If you find you have a problem with your C4, just cap it and enjoy the scope!