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Nikon new BDC reticle |
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encoreguy
Optics GrassHopper Joined: March/05/2006 Location: United States Status: Offline Points: 24 |
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Posted: March/06/2006 at 08:59 |
I saw on their web site that they are offering a new BDC reticle on many of their scopes. Has anyone seen one? What are your thoughts?
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Dale Clifford
Optics Jedi Knight Joined: July/04/2004 Location: United States Status: Offline Points: 5087 |
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all BDCs are a compromise of how well the rounds you just bought match the "distancing" in the reticle. Thus if you had say a 30-06 with a BDC that was set for the velocities obtainable in a 24 in barrel but you decided to use it on your DSA 16" the scope would be way off. This is why ACOG has two scopes, one for 20s and one for M4s. No BDC can be as well matched as handloads, chronographed and then "dialed in". It is possible to cross match . Given the ballastic curve of the BDC, find all bullets and velocity combinations following that shape with the Ballastic coef. of other calibers or at least close to it, then use handloads to duplicate that ballistic profile. Programs such as Sierra's and Ohlers make this pretty easy. Mil-dot type systems approach this problem by eliminating the progressive drop as distance increases. Nikon hasn't gotten into many reticle wars for who knows what reason. This hind sight on their part may prove a smart move afterall as laser rangefinders "outdate" all in scope ranging reticles.
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encoreguy
Optics GrassHopper Joined: March/05/2006 Location: United States Status: Offline Points: 24 |
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My ballestic plex reticles in my Burris scopes have worked very good for me in hunting situations. I simply shoot my favored load and come up with my own chart on the marks. I use a range finder, then adjust to the proper tick mark and squeeeeeeeeze. In coyote hunting I just don't feel that I have time to "dial in" but you bring up a good point that doing so is by far the most accurate way. I was just curious what people thought of the looks and layout of their new reticle.
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Urimaginaryfrnd
MODERATOR Resident Redneck Joined: June/20/2005 Location: Iowa Status: Offline Points: 14964 |
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That's the secret you have known fixed points (lines inside the scope) and you shoot enough to determine what distance those fixed points in the scope represent with your ammunition..
P.S. Laser rangefinders are great until the battery goes out at the worst possible time. |
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"Always do the right thing, just because it is the right thing to do". Bobby Paul Doherty Texas Ranger |
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catusbill
Optics Apprentice Joined: July/07/2005 Location: United States Status: Offline Points: 161 |
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You fellows may find this interesting. I'm trying to find loads in .223
and .308 with close trajectory to optimize my BDC on Burris FF-II .
Federal American Eagle Full Metal Jacket AE223N AE308D WT 62 150 BC 307 408 100 1.6 1.8 200 0.0 0.0 300 7.5 7.9 400 22.4 23.0 500 46.6 46.8 Maximun difference is .6 of an inch. With all things considered this is usable on a BDC scope. You just need to test fire at range and chart the scope hash marks to the distance. |
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sscoyote
Optics Journeyman Joined: October/05/2004 Status: Offline Points: 328 |
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Usually for my applications i apply a "tactical" system with the reticle, since the handguns i'm using don't match std. trajectories well. Besides that if i wanna use a mil-dot reticle i want a system that gives me exact zeros, and then interpolative for the in-between ranges. Here's the system i use--
1) Convert stadia subtensions from inch per hundred yds. to MOA
2) Run ballistics program for load.
3) Match up MOA calcs for reticle zeros.
4) Check each zero at range
5) Note difference (in MOA) between ballistic profile and real world shooting for stadia zeros.
6) Adjust BC or muzzle velocity of load in ballistics program until i get the best reticle-trajectory fit.
7) Calculate interpolative zeroing between stadia.
8) Calculate the same for windage.
9) Make range sticker for gun and laser.
10) Recheck occasionally. |
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Steve
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