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M-1 Turrets Explained (pictures)

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by Horsager , Posted to Fishing Buddy on 12/22/2010 8:32 PM | "Quote" | "Quick Reply" |

Horsager

Joined: 08/12/2003
Location: ND

M-1 turret sighted in and "zero'd". This rifle is zero'd for 200yds:

I want to make a hit at 500yds so I consult my drop chart:

Max Point blank range is 285 yds when zeroed at 243 yds.

Range
yds Path
in Come Ups
moa+clks Velocity
fps Windage
in Windage
moa+clks

Muzzle -1.5 Infinity 3010 0.0 NaN

50 0.5 -1 + 0 2869 -0.2 0 + 2

100 1.5 -1 + 2 2733 -0.9 0 + 3

150 1.3 -0 + 3 2601 -2.0 1 + 1

200 -0.2 0 + 0 2473 -3.7 1 + 3

250 -3.1 1 + 1 2350 -5.8 2 + 1

300 -7.6 2 + 2 2230 -8.6 2 + 3

350 -13.8 3 + 3 2113 -12.0 3 + 1

400 -22.0 5 + 1 2000 -16.1 3 + 3

450 -32.3 6 + 3 1890 -20.9 4 + 2

500 -45.1 8 + 2 1784 -26.5 5 + 0

550 -60.6 10 + 2 1683 -33.0 5 + 3

600 -79.2 12 + 2 1586 -40.4 6 + 2

650 -101.3 14 + 3 1495 -48.7 7 + 1

700 -127.2 17 + 1 1409 -58.2 8 + 0

750 -157.5 20 + 0 1330 -68.7 8 + 3

800 -192.8 23 + 0 1258 -80.4 9 + 2

With a 200yds zero (highlighted in yellow), based on this chart I need to make an 8.5MOA elevation adjustment. The scope has 1/4MOA clicks so this amount is expressed at 8+2 on the chart, that means 8MOA plus 2 more clicks.

Here's how the turret will look when properly adjusted for a 500yd shot:

No holdover, no guessing. Point, squeeze trigger, collect dead critter.

Any questions?

..............THIS SPACE FOR RENT..............

Re: M-1 Turrets Explained (pictures)

by taylorman_55 on 12/22/2010 8:46 PM | Reply #1 | "Quote" | "Quick Reply" |

taylorman_55
Joined: 02/24/2010
Location: ND

nice.. ive seen a few of these around... how much does scope like this run? Looking for something new on my 7mm Ultra

Re: M-1 Turrets Explained (pictures)

by Horsager on 12/22/2010 8:49 PM | Reply #2 | "Quote" | "Quick Reply" |

Horsager
Joined: 08/12/2003
Location: ND

Your Leupold + $90 for an elevation turret or $130 for elevation and windage. 5ish days shipping to Leupold, 3-5 days there, 5ish days home.

..............THIS SPACE FOR RENT..............

Re: M-1 Turrets Explained (pictures)

by mauserG33-40 on 12/22/2010 8:56 PM | Reply #3 | "Quote" | "Quick Reply" |

mauserG33-40
Joined: 05/24/2008
Location: Mo

I know this sounds dumb but you will have a chart for each load you are shooting right?

Re: M-1 Turrets Explained (pictures)

by Horsager on 12/22/2010 9:07 PM | Reply #4 | "Quote" | "Quick Reply" |

Horsager
Joined: 08/12/2003
Location: ND

mauserG33-40 Said:
you will have a chart for each load you are shooting right?

Yes. Typically I'm a 1 load/rifle shooter so I can build the load, print out the chart, tape it to the stock and run it. In a pinch this fall I used a sharpie and wrote the "come-up" data right onto my grey Kimber Montana stock.

..............THIS SPACE FOR RENT..............

Re: M-1 Turrets Explained (pictures)

by MOOSTRX on 12/22/2010 9:08 PM | Reply #5 | "Quote" | "Quick Reply" |

MOOSTRX
Joined: 12/09/2006
Location: ND

Or you can have a buddy standing next to you saying "you hit the rock below him, aim a little higher".

If you give Leupold your load data and say you are going to zero the rifle at 100 yds, can they put on an elevation turret that shows yardage marks rather than MOA? I know that would make the scope somewhat load and gun specific but it might be easier to turn to 300 yds rather than trying to look up the MOA on the table?

Re: M-1 Turrets Explained (pictures)

by Jiffy on 12/22/2010 9:12 PM | Reply #6 | "Quote" | "Quick Reply" |

Jiffy
Joined: 01/08/2002
Location: ND

I've never been coy so I'll just state that anybody that uses anything other than M1s or the likes are just putting themselves behind the 8 ball. There isn't any reason NOT to if one desires to actually learn turrets. Nevertheless I am an elitist bastard....

Re: M-1 Turrets Explained (pictures)

by KurtR on 12/22/2010 9:25 PM | Reply #7 | "Quote" | "Quick Reply" |

KurtR
Joined: 04/16/2007
Location: SD

MOOSTRX Said:
Or you can have a buddy standing next to you saying "you hit the rock below him, aim a little higher".

If you give Leupold your load data and say you are going to zero the rifle at 100 yds, can they put on an elevation turret that shows yardage marks rather than MOA? I know that would make the scope somewhat load and gun specific but it might be easier to turn to 300 yds rather than trying to look up the MOA on the table?

you could but dont know why you would want to pigeon hole your self like that. Is it really that hard to see 8.5moa and turn to the big 8 and go another 1/2 a minute. In situations like this when you are shooting long range you have the time to get set range check chart dial and shoot.

Please Watch http://cryingwolfmovie.com/

Re: M-1 Turrets Explained (pictures)

by Allen on 12/22/2010 9:40 PM | Reply #8 | "Quote" | "Quick Reply" |

Allen
Joined: 01/09/2002
Location: ND

Clay, I am curious as to the windage on your charts. I see adjustment values, but none for wind speed. What is the wind speed for this particular load? About 10 mph cross wind?

“Sometimes I wonder whether the world is being run by smart people who are putting us on or by imbeciles who really mean it.” ~ Mark Twain

Re: M-1 Turrets Explained (pictures)

by Horsager on 12/22/2010 9:50 PM | Reply #9 | "Quote" | "Quick Reply" |

Horsager
Joined: 08/12/2003
Location: ND

MOOSTRX Said:
If you give Leupold your load data and say you are going to zero the rifle at 100 yds, can they put on an elevation turret that shows yardage marks rather than MOA? I know that would make the scope somewhat load and gun specific but it might be easier to turn to 300 yds rather than trying to look up the MOA on the table?

If you're into paying more and getting less, the above route is your huckleberry.

..............THIS SPACE FOR RENT..............

Re: M-1 Turrets Explained (pictures)

by Horsager on 12/22/2010 9:52 PM | Reply #10 | "Quote" | "Quick Reply" |

Horsager
Joined: 08/12/2003
Location: ND

Allen Said:
Clay, I am curious as to the windage on your charts. I see adjustment values, but none for wind speed. What is the wind speed for this particular load? About 10 mph cross wind?

10MPH is correct. If wind is constant (which it never is, hence the need for voodoo lessons) it's a linear extrapolation as it's based on time of flight. 5MPH, cut the values in half. 20MPH, double them.

..............THIS SPACE FOR RENT..............

Re: M-1 Turrets Explained (pictures)

by parker503 on 12/22/2010 9:53 PM | Reply #11 | "Quote" | "Quick Reply" |

parker503
Joined: 10/25/2004
Location: ND

I plan on sending in the leupold on my 300 wsm within the next year to get this done. I have done a little bit of looking around at different turrets but I will probably just end up sending it into the custom shop there at Leupold. I do reload and would have no problem settling on one load to stick with for all hunting situations with that particular gun/scope combo. So since I don't own any ballistics software or even a chrono, what is the best way I should go about getting an accurate chart?

I am also not crazy about the windage turret because once dialed in it seems like it would be pretty tough to make adjustments "on the fly" if the wind were to gust or let down a little at the last second. I feel like if the wind/range scenario was too much for me account for and hold over on....I should probably not be shooting. I have no experience with turrets, so maybe there is something I am missing here? If it were you, would you put elevation and windage turrets on.....or just an elevation turret?

Re: M-1 Turrets Explained (pictures)

by Horsager on 12/22/2010 10:09 PM | Reply #12 | "Quote" | "Quick Reply" |

Horsager
Joined: 08/12/2003
Location: ND

parker503 Said:
I plan on sending in the leupold on my 300 wsm within the next year to get this done. I have done a little bit of looking around at different turrets but I will probably just end up sending it into the custom shop there at Leupold. I do reload and would have no problem settling on one load to stick with for all hunting situations with that particular gun/scope combo. So since I don't own any ballistics software or even a chrono, what is the best way I should go about getting an accurate chart?

One load for 1 rifle forever sounds like a good plan, a plan I attempt to follow myself as often as possible. That said, what happens when your chosen bullet or powder is altered or discontinued? What happens when you want to go on a trip somewhere only to find out that lead-free ammo is you're only option (see culling in TRNP as an example)?

Ballistics software is free on the web, here you go:

http://www.biggameinfo.com/index.aspx?page=%2fbalcalc.ascx

http://www.jbmballistics.com/cgi-bin/jbmtraj_simp-5.1.cgi

Make friends with someone who owns a chrono.

parker503 Said:
I am also not crazy about the windage turret because once dialed in it seems like it would be pretty tough to make adjustments "on the fly" if the wind were to gust or let down a little at the last second. I feel like if the wind/range scenario was too much for me account for and hold over on....I should probably not be shooting. I have no experience with turrets, so maybe there is something I am missing here? If it were you, would you put elevation and windage turrets on.....or just an elevation turret?

Leupold's duplex reticle in a 3.5-10x40/50 or 4.5-14x40/50 subtends 5.4MOA on 10x/14x to the duplex intersection.

In simpler terms, with either of the above listed scopes, turn them to the highest power. On the horizontal crosshair where the fat and skinny part meet, that distance is 5.4MOA. With the above listed chart, marked in red is 5.0MOA of wind drift meaning you could use the horizontal duplex intersection in a full-grade 10MPH wind and be less than 2.5" off betwee POI (Point of Impact) and POA (Point of Aim). Chart calls for 5MOA, reticle affords you a known 5.4MOA subtension. .4MOA @ 500yds is less than 2.5". Few folk can hold steady enough in the field to discern 5.4MOA from 5MOA @ 500yds.

I'm also not much for dialing wind because it's not constant. Windage and accurate correction for same is only learned via popped primers IMO. It's never more than an educated guess, so one might as well obtain all the education possible (again referring to popped primers).

..............THIS SPACE FOR RENT..............

Re: M-1 Turrets Explained (pictures)

by Geothermal on 12/22/2010 10:17 PM | Reply #13 | "Quote" | "Quick Reply" |

Geothermal
Joined: 07/14/2009
Location: ND

I like to pay close attention to the top knob and kentucky the wind and mirage.

Re: M-1 Turrets Explained (pictures)

by parker503 on 12/22/2010 10:48 PM | Reply #14 | "Quote" | "Quick Reply" |

parker503
Joined: 10/25/2004
Location: ND

Very helpful.....thanks Horsager.

Re: M-1 Turrets Explained (pictures)

by Whisky on 12/23/2010 00:56 AM | Reply #15 | "Quote" | "Quick Reply" |

Whisky
Joined: 10/06/2010
Location: ND

It's not that complicated, as long as you have the correct ballistics to begin with. Tape a chart to your stock with drop and windage for 5-whatever mph wind, and your are set. You can dial, or holdover,whatever you want. I my self am not the greatest with math in the head in a quick situtation, so I have drop for each guns effective range taped on it, as well as windage for 5-30mph full value winds in 5mph increments. On my longer range 308, with M1's, I also have number of clicks listed right next to inches so I don't have to figure that out in my head under pressure.

If I'm hunting, I"ll more than likely holdover vs dialing. It's quicker and once you gain experience and confidence in your info, it'll work great for you. If you have the time to dial, by all means do it. But you won't always have time to consult your chart, make adjustments, and shoot. Depends on your game and situation.

I also learned last weekend, the hard way, to not fully trust the online ballistics software. JBM as an example, with my load, gave me 6" of drop at 350 with my 22-250 load. WRONG. I held on the forehead and hit the coyote in the leg. It was more like 11" of drop. My buddy who has developed and hunted with this load for years, shot the load at various distances and recorded drop. Had I accounted for an 11" drop (his info) vs a 6" drop (JBM ballistics info), it would have been a dead dog.......

Something to think about.

56 Replies | Page 1 of 41 2 3 4 Next Page >> | Top of Page | Bottom of Page

Posted By: Horsager
Posted On: 12/22/2010 8:32 PM

2250 Views, 56 Comments

Tags: m-1, pictures, turrets, explained, zero, chart, zero'd, 0, 200yds, elevation
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Region: North Dakota

Categories: Hunting > Guns and Ammo - Shotguns, Rifles, Airguns, Handguns

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