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#65470 - 02/28/10 09:31 PM

Drop compensation??

TCTex.
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I am working on ballistic tables for a 30-06 shooting a 150 projectile. I want to use my mil-dot as a “ballistic plex.” The only way I know how to do this is by set up targets at the actual intended ranges with corresponding drops. EG, have a box set up at 400 yards with blue tape indicating the proper drop and then view the target threw the scope and count the mil’s.

I plan on doing this out to 500 yards, but is there another way to figure out drop charts and mil dot placement.

Thanks in advance

Duanec

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#65474 - 02/28/10 10:04 PM

Re: Drop compensation?? [Re: TCTex.]

Dan B.
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I've been using the JBM Trajectory Calulator lately and it is working great! You'll need to know you parameters (alt, temp, fps, bc, scope height, etc, etc)

Plug those in then run the calc's. You select how you want the data displayed...MOA, inches, mils. Run yours in mils and it will tell you what mils relate to yardage. Then go out and shoot to confirm the results.

JBM Calculator

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#65482 - 02/28/10 10:31 PM

Re: Drop compensation?? [Re: Dan B.]

s4s4u
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Great link Dan, thanks.

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#65495 - 03/01/10 08:43 AM

Re: Drop compensation?? [Re: TCTex.]

KRal
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Another good calculator is.....http://www.handloads.com/calc/
but, confirmation is still important.

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#65507 - 03/01/10 02:00 PM

Re: Drop compensation?? [Re: KRal]

TCTex.
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Originally Posted By: KRal

Another good calculator is.....http://www.handloads.com/calc/
but, confirmation is still important.

Your 100% right... I would like to do it both ways. It also helps when you trying to shoot at an odd ball range. I would like to get several ranges confirmed manually AND try to figure out the trajectory threw math…

My goal is to be practicing this summer on armadillos!! (insert sinister laugh here)

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Democracy is two wolves and a lamb deciding what to have for dinner. Liberty is a well armed lamb contesting the vote

Benjamin Franklin

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#65534 - 03/01/10 08:14 PM

Re: Drop compensation?? [Re: TCTex.]

TCTex.
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Registered: 09/01/07
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Dan... I owe you one!!!!!

I started playing around with that sight and all I can say is that I am a sponge!

THANK YOU VERY MUCH!!!

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Democracy is two wolves and a lamb deciding what to have for dinner. Liberty is a well armed lamb contesting the vote

Benjamin Franklin

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#65535 - 03/01/10 08:18 PM

Re: Drop compensation?? [Re: TCTex.]

rlb
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Registered: 02/22/09
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If you're practicing in the heat of the summer just remember the load will more than likely shoot different in the hunting season so make sure you go back and check velocity on your load and make necessary corections on your chart. Especially if you are using a temp sensitive powder.

Just a thought.

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#65537 - 03/01/10 08:40 PM

Re: Drop compensation?? [Re: rlb]

Dan B.
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No problem buddy. I did this with my .260R Striker then a 7mm RSAUM and 300 RUM rifle. After running the tables and zeroing at a known distance, I ran the dials to various ranges from 200 to 500yds and all three were DEAD ON!

I can't wait for about three FEET of snow to melt so I can stretch out my .308W Competitor and do some more work with JBM.

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#65543 - 03/01/10 09:07 PM

Re: Drop compensation?? [Re: Dan B.]

TCTex.
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Registered: 09/01/07
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Thanks RLB, I haven't gotten that far... yet...

I got spoiled with my Wife's 30-06 and a Burris Ballistic-Plex. I am wanting to learn the Mil-Dot for both ballistic compensation and rangefinding!

Wow I feel like I just got my feet wet...

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Democracy is two wolves and a lamb deciding what to have for dinner. Liberty is a well armed lamb contesting the vote

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