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# Allen Mag Shooters Group

#29
12-28-2006, 12:29 PM
 Silver Member Join Date: Dec 2005 Posts: 181
Re: Well, I\'ll think I\'ll do what Kirby says from now on......

Roy, so you are saying:

i @ y
y x 1m = tmy
i / tmy = tmoa
tmoa x C4 = tc

I'm brain dead after all that cyferin. I need a crash course in MOA for a dummy (me). Don't know why I can't grasp how many 1/4 clicks of MOA to inches needed to be moved to 1/4 MOA total clicks. Now I an confusing myself again just trying to explain. For example: 1MOA = 1.047. So if you divide 1.047 by 4 you get .26175 which rounded to .262. So, I know I need to move 48". So I (dummy) would think you would take the inches (48) divide that by .262 cause that's what a 1/4MOA click would be I think, and you get 183.2061. Noway A. OK, so let's try this 48"x.262=12.576, is that the total clicks, don't think so, now I'm really F'ed up.

#30
12-29-2006, 10:23 AM
 Platinum Member Join Date: Jan 2004 Location: Blackfoot, Idaho Posts: 8,876
Re: Well, I\'ll think I\'ll do what Kirby says from now on......

Tim/Tx it gets worse than that .....

From your above example shooting at 1150.

1 MOA @ 1150 is 1.047*11.50 or about 12"

Then 48/12= 4MOA or 16 clicks into the wind.

Here's one for ya.

Went to a yote spot w/son yesterday.
After the Dodge crew cab drove thru at about the 365 yard mark we decided to punch holes in snow (bustin rocks with a flair)

Seeing as how I hadn't shot the big girl beyond 500 meters I figured I see how the drop chart was working.
Was shooting the 169s @ 3250 and say 7 MPH cross wind.

I ranged a certain snow pattern with a rock in it at 634 yds. Clicked up 6.5 MOA per dope chart. Ignored the wind.

Son was spotting. First shot way low [img]/ubbthreads/images/graemlins/confused.gif[/img] Couldn't be? Second shot, same spot? Clicked up 2 MOA. Mind went to mush (read no calculator [img]/ubbthreads/images/graemlins/crazy.gif[/img]) Next shot still low. Ripper 'er up to 9 MOA. Shot was about 2" high (grooved the snow on top of the rock. We figured the rock was about the size of a clay pigeon maybe a bit larger)

No more clicks for the next shot, just got serious with the hold and trigger brake. Smack - dead on. Smiles cause I hit it. Frowns cause the drop chart was 2.5MOA off. (more on this later)

Sons turn. Shooting the 270 Win w/140 Hornadys @ 3200.

He asked what the range was, again. Our target was between the tops of two junipers. The Leica sighting square just fit in the opening. I told him 634 yds just as I got a 771 reading [img]/ubbthreads/images/graemlins/confused.gif[/img] After more careful ranging the target was @ 771yds, 134 yds beyond the trees.

Guess what. Drop chart said 9.1 MOA and I had to adjust to 9.0 to hit the target. I'd say drop chart is pretty much on . And that's using a bc of 0.74.

The very interesting part was I did not hold for the wind and it was blowing that little 140gr bullet a bunch. but once he learned how much affect the wind had he hit the target also.

Twas a good day, except for the Dodge. [img]/ubbthreads/images/graemlins/frown.gif[/img]
__________________
I may be the slowest guy on the mountain . . . . but . . . . I'm on the mountain!
#31
12-29-2006, 04:53 PM
 Gold Member Join Date: Feb 2005 Location: Texas born and raised Posts: 752
Re: Well, I\'ll think I\'ll do what Kirby says from now on......

Hey Roy,

I think Tim is about reaching info overload on the scope adjustments. He has gone from brain twisting the Mil dots in one scope to another using a ballistic plex but in IPHY, to now trying to calculate the drops using knobs and bars. He is a math whiz and this is eating him up.

Kinda fun to watch though. [img]/ubbthreads/images/graemlins/grin.gif[/img]
__________________
Later,
Mike / Tx

My Photo's

"Heck why would I lie, most folks don't believe the truth when I tell them"
#32
12-29-2006, 08:23 PM
 Platinum Member Join Date: Jan 2004 Location: Blackfoot, Idaho Posts: 8,876
Re: Well, I\'ll think I\'ll do what Kirby says from now on......

Yeah, I just gone through all of that Mils etc finally have gone with clicking. Just trying to remember to reset for different range......

Used to think mil dots were the cats meow but what ya really want is reticle in mils and knobs in mils or both in MOA. MOA would be much much easier.

Hey I can't get my 195s shooting worth a squat. The 169s are doing bug holes @ 200 and CD size things @ nearly 800.

195s are consistently inconsistent. Have gone through most of a hundred and have nothing shootable yet.
__________________
I may be the slowest guy on the mountain . . . . but . . . . I'm on the mountain!
#33
01-03-2007, 10:15 PM
 Silver Member Join Date: Dec 2005 Posts: 181
Re: Well, I\'ll think I\'ll do what Kirby says from now on......

Roy. try some WC872 with those 195's. Me and Mike ordered some WCC860 to try out. I'm still unhappy with the performance of the H-869. I was talking to a reliable source on the surplus powders today and he says the H-869 is most likely from the Nam era. [img]/ubbthreads/images/graemlins/frown.gif[/img]

Tim
#34
01-04-2007, 03:01 AM
 Platinum Member Join Date: Dec 2001 Location: Mukilteo, WA Posts: 1,092
Re: Well, I\'ll think I\'ll do what Kirby says from now on......

[ QUOTE ]
I was talking to a reliable source on the surplus powders today and he says the H-869 is most likely from the Nam era. [img]/ubbthreads/images/graemlins/frown.gif[/img]

[/ QUOTE ]
I have a hard time believing that.
#35
01-04-2007, 08:56 AM
 Silver Member Join Date: Dec 2005 Posts: 181
Re: Well, I\'ll think I\'ll do what Kirby says from now on......

Jon, the feller I talked to was Jeff Bartlett @ 800-714-6348. Give him a call, he really seems to know his business about the different powders I was quizzing him over.

I was trying to get him to nail down a burn rate for WCCC-860, which was designed for the 50cal. as it looks close to the rate of AA-8700 which I am having good sucess with in my 270AM.

The problem he said with surplus powders is that there is overlaps in the burn rates depending on the lott you get. In other words a fast lott of WC872, which is listed to be slower than WCC-860 may actually burn faster than the faster listed powder WCC-860, and visa versa. I also ask him about H-869 and that is when he told me that he thinks it was W-869 left over from the Nam era and was used in the 20mm.

Give him a call and let's see if you get different info then I got, but that's what the man told me.

Later Tim

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