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thoughts on the leupold mark ar 3x10-40

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/01/2009 at 23:42
jdrichie View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/01/2009 at 23:45
jdrichie View Drop Down
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tell me what you think. i think im going with the mark ar for my rock river. 
or should i upgrade to a vxiii, 4200, monarch, all 3x10-40?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/02/2009 at 02:41
danjojoUSMC View Drop Down
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I don't think a single one of those is 3-10x40

Leupold AR series the bdc is calibrated for 55 grain loads.  All jacked up....

Why have a scope with a bdc for some of the worse loads possible?

It would be better to just get a cheaper Leupold and have the custom shop do bdc knobs for the load you like.  Most of the common bdc reticles out there match the better 75-77gr. loads pretty good already.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/02/2009 at 02:47
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Maybe if you was lucky enough to stack up on a lot of M193 before prices started to shoot up it would be ok for lots of plinking and varmint hunting.

Not right for you if you want it to match good loads for hunting larger animals, people, or long range targets.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/02/2009 at 23:03
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really the only thing ill be shooting @ is targets and varmints. coyotes mostly, i like calling them in to about 200 yards, then it gets tougher for me. is it ok to shoot 75+ grains in a 1:8 twist. i thought the heavier grain bullets (65 and over?) needed a 1:12 or so. 
im new to rifles. this rock river .223 20" bull is my first rifle. i grew up bird hunting in iowa so i dont know much other than what i read or hear from others. 
tell me what you think i should get for it. i thought the mark ar would be good and easy.

thanks usmc
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/02/2009 at 23:38
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If its just targets and varmints out to 300 yards the Leupold AR scope would be fine.  55 grain bullets have very crappy ballistic coefficiency, they lose velocity very quickly and velocity is the only thing for them that does damage. 

If you check out pages like this http://ammo.ar15.com/project/Self_Defense_Ammo_FAQ/index.htm#.223

you see heavy bullets are best....pretty much the same for every caliber, rifle or handgun...they fly better through the air with high ballistic coefficiency and smack harder, penetrate better, or if they fragment it's more bullet exploding in the body.

Some 75 grain rounds are recommended at 1:8 and some say ok at 1:9....the heavier the bullet the faster the twist to properly stabilize them.  A longer barrel with more velocity can often do it with a slow twist still.  1:12 twists common to older 223 bolt actions and AR's are set up for 55gr. 193 nato ammo and the similar spec'd varmint loads.

Hornady 75 gr.  Tap & Match, and Prvi Partisan 75gr. Match are considering the best buys for the money.




Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/03/2009 at 00:14
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Your 20" should shoot everything up to 77grains very well.  If it was a 16" some people would say you might need a 1:7, but you will be good with 1:8 twist.

Just always keep in mind the lower the number the faster the twist, even though it seems kinda backwards at first.  It is saying one full twist in however many inches.

Go to http://www.jbmballistics.com/~jbm/cgi-bin/jbmtraj-5.0.cgi

Pick out some different .224 bullets from the list and put in the other info where you see fit and check out how they will generally act at the distances you shoot.  If you will shoot at all 300-400 the wind is a huge difference from 55gr-75gr loads.

Check out the 55 grains at 3150, 62 grains at 3000, and 75 grains at 2700...you might get lower or higher velocity but it will show you how much a difference the longer 75/77 grain bullets make.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/03/2009 at 00:31
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Aimpoint 9000SC 30mm Red Dot Sight 2 MOA Dot Aimpoint 9000SC 30mm Red Dot Sight
Stock # - AIIM11417
  • Matte
  • 2 MOA Dot
  • 30mm
  • Free Aimpoint Bikini Lens Cover w/ Purchase
$373.95 
Add Aimpoint 9000SC 30mm Red Dot Sight to Cart
I'd call SWFA and ask if this mount would fit  if not Warne should:
SWFA S.S.A.L.T.  30mm / 1 SWFA S.S.A.L.T. 30mm / 1" Scope Mount
Stock # - SS30HSSALT
  • Picatinny MIL-STD-1913
  • Matte
  • Comes with 1" Inserts
$59.95 
Add SWFA S.S.A.L.T.  30mm / 1 Scope Mount to Cart 
I shoot an AR all the time zeroed at 200 with a  69 gr SMK with a 2moa dot and at 300 you would just hold about 10 inches high.   This will work for you even in very low light at night for coyotes.

Edited by Urimaginaryfrnd - September/03/2009 at 00:32
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/03/2009 at 21:15
jdrichie View Drop Down
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thanks usmc. youve been a lot of help. i know all that ballistic junk if its in a table of some sort. so ill try the horndays tap and match and see what works best, cant wait.
by the way, i see your in san diego, ever been to mc p's or danny's?

thanks, jd
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/03/2009 at 22:45
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jdrichie, Just an FYI. I talked to Rock River about what bullet weights work best in their 1:8 twist. i figured they would know what worked best in their AR's. They said for both my 16" and 24" bull barrels 68 to 72 gr. I have used both 68gr (Do not recall what bullet type though) and the 69gr SMK's. The 69gr SMK's shoot very well. So that is all I buy now.

As far as the scope selection I would strongly take a look at the SS 3-9. They are similar in price to what you have listed, but a real step up in every respect from those you listed. Also I think they are still offering that scope in a package with a mount as well as other useful items.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/03/2009 at 23:11
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MC P's and Danny's are bars?  I haven't been out for a long time...when I got out the Marine Corps I spent a year and half going out almost every single night and spending all the money I had saved up....then I met my wife and I don't do jack but raise the babies and shoot at the pistol range twice a month.

Been to almost every bar or club in this area but don't remember those names...unless they are something else Smile

Urimaginaryfrnd and Sparky bring up some good stuff to look at.

Check out Berger bullets too if you are going to reload, anybody I've talked to about them says they love them and up to their 82grain is recommended for 1:8 twist (you would single load).  My friend I get to talk to every now that lives in Wyoming only uses Berger bullets...talks about them like they are the love of his life.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/04/2009 at 05:49
jdrichie View Drop Down
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well thanks all for the info. 
we spent our honey moon on coronado island, the only good bar we found was danny's. small navy seal hang out. cool place. mc p's just up the street. 
so if this was your set up what scope would you buy?

rock river 20" bull barrel.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/04/2009 at 10:30
danjojoUSMC View Drop Down
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I would wait to see if SWFA does set up a SS with Horus reticle.  The Variable that so many mention already as being great with their AR would be perfect for me with that addition.

I just put in for Coronado Police Department a few days ago....hope it falls through.  Coronado was one of the few places I never did go to for nights out on the town, it's a beautiful place though.

I'm not sure what I would put on the Rock River right now if I had it....the pro's here probably have better ideas.  I've been looking more for optics for close quarters carbines/shotguns and for 308/30-06 bolt action rifles.

I've seen a lot of animals and people shot though and I can help with the bullets thing more, less with optics.


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