Load optimization for Mrad

[Creekfisher]

Hello everyone, lurking on and off for a while but this is my first post.

After messing around with a ballistic calculator i started wondering if a certain combination of ballistic coefficient, velocity, and zero range could be manipulated to use the Mrads as holdover points. Similiar to a BDC reticle but using the standard mrads.



Theoretically

 

[Huskydriver]

This is the whole idea of a holdover style reticle is that you shoot your rifle at set distances then "memorize" the mil hold required for that distance.

The slang word dope used in the phrase know your dope means data on previous engagement. Meaning we record what hold our rifle requires at a certain distance with a given set of environmental conditions.

Once you have your rifle doped, you can then choose to dial the correct mils or just hold over the correct mils in the scope. Google a few mil reticles to get an idea of what I'm talking about, tremor 3, ebrc2c or 7b, skmr3, h59.

 

[Creekfisher]

Yeah, i was just wondering if a certain combination of bc, velocity, and zero distance would be able to exactly or very nearly match the existing mrads. Kind of like this table almost does.

Its off on 200, 600, 700, and 800 yards. No decimals or fractions required for basic 100 yard increments and splitting the difference would be very simple for actual ranges in between.

 

[308pirate]

Yeah, i was just wondering if a certain combination of bc, velocity, and zero distance would be able to exactly or very nearly match the existing mrads. Kind of like this table almost does.

Its off on 200, 600, 700, and 800 yards. No decimals or fractions required for basic 100 yard increments and splitting the difference would be very simple for actual ranges in between.

You're making this harder than it needs to be.

 

[Deleted member 113831]

Yeah, i was just wondering if a certain combination of bc, velocity, and zero distance would be able to exactly or very nearly match the existing mrads. Kind of like this table almost does.

Its off on 200, 600, 700, and 800 yards. No decimals or fractions required for basic 100 yard increments and splitting the difference would be very simple for actual ranges in between.

This is commonly done. The subtensions will not change because a mil is a mil and cannot be anything else. But what can be done is cheat your 100 yard zero to make the trajectory of your round fall evenly on the mil dots.

For instance, with a 308, if you zero 0.3 mils high at 100, then 300, 400, 500, 600 fall right on the dots.

With different cartridges you may need to cheat a little more or less, or even use a 200 yard zero. But most can be set up this way.

 

[Creekfisher]

You're making this harder than it needs to be.

Its a complicated math problem t

This is commonly done. The subtensions will not change because a mil is a mil and cannot be anything else. But what can be done is cheat your 100 yard zero to make the trajectory of your round fall evenly on the mil dots.

For instance, with a 308, if you zero 0.3 mils high at 100, then 300, 400, 500, 600 fall right on the dots.

With different cartridges you may need to cheat a little more or less, or even use a 200 yard zero. But most can be set up this way.

For 308, what weight(bc), sight height and velocity did you get these results?

 

[Deleted member 113831]

175 Sierra Matchking, @ 2650 fps with 1.8" sight height. That is about as standard as it gets for 308.

 

[fdkay]

MRAD is short for milliradian.
Do you mean the mil-dots or hashes?
If so, download strelok on your phone, it has a catalog of different reticles in it and will plot your holdovers and give you a picture.

 

[308pirate]

Its a complicated math problem t


For 308, what weight(bc), sight height and velocity did you get these results?

I don't know what you're talking about

 

[highhope]

This is the whole idea of a holdover style reticle is that you shoot your rifle at set distances then "memorize" the mil hold required for that distance.

The slang word dope used in the phrase know your dope means data on previous engagement. Meaning we record what hold our rifle requires at a certain distance with a given set of environmental conditions.

Once you have your rifle doped, you can then choose to dial the correct mils or just hold over the correct mils in the scope. Google a few mil reticles to get an idea of what I'm talking about, tremor 3, ebrc2c or 7b, skmr3, h59.

thx a lot. learned

 

[Conaso]

Try Strelok (free) and once your rifle and cartridge data is entered select RETICLE. I use a labeling machine for my hunting scopes for 50 yard increments up to the the cartridges max. effect range, e.g., *250 **360 ***540, etc

 

[morganlamprecht]

ive done it before with 223 and 6creed like skookum mentioned above...i cant remember the exact numbers and zero set up but i wanna say it ran from 300-700 or 800 all within .1

the 223 was 80 vlds going like 2700-2750

the 6 creed was 108 eld going like 2650

those numbers may not be perfect, trying to remember years back, but theyll get you close at sea level...i ran it in a couple matches at places that only used 100 yd increments, but most of the places i shoot use various distances so i didnt mess with it long...not worth the effort IMO unless youre always shooting 100 yd increments

 

[Deleted member 113831]

The real benefit of using that way of zeroing is snap shooting multiple moving targets out to 600 yards. That is the reason it was employed in the first place. Out to 600 yards with a 308, your danger space is still deep enough to accomodate some largish errors in range estimation on a man sized target.