New guy with a question - Shooting Sports Forum


Ruger Mini-14 and Mini-30 Ruger Mini-14 and Mini-30 family of rifles

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Old 11-07-2013, 08:47   #1
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New guy with a question

Hey guys new member here, i've read here forever just never joined, its a great site anyways i have a 580 series ss ranch and will be using it to hunt this year here in fl the deer are small, i will be using hornady 75 gr bthp ( a guy that used to work were i work used to use those and he said everytime he hit a deer it went down)the question is i just put a scope on it so to sight it in can i do it at 25 yds and be good out to 100 yds or should i sight it in at 100 yds.
Thanks for your replies
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Old 11-07-2013, 08:50   #2
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2 inches high at 25 yards will be close to dead on at 100 yards. At least it is on my AR 15.
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Old 11-07-2013, 09:10   #3
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I would sight it in at the maximum distance you think you are likely to be shooting a deer at. At short distances your scope sight-in is more effected by the distance between the bore of your rifle and the centerline of the scope, so sighting at 100 yds. when your only shooting at 25 yds could be off a couple of inches. You would do well to have the lowest ring hieght possible without your scope interfering with the rifle action. I would go with a 1-4x power and 32 mm glass diameter scope in your situation.
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Old 11-07-2013, 10:53   #4
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Originally Posted by Offshore2 View Post
Hey guys new member here, i've read here forever just never joined, its a great site anyways i have a 580 series ss ranch and will be using it to hunt this year here in fl the deer are small, i will be using hornady 75 gr bthp ( a guy that used to work were i work used to use those and he said everytime he hit a deer it went down)the question is i just put a scope on it so to sight it in can i do it at 25 yds and be good out to 100 yds or should i sight it in at 100 yds.
Thanks for your replies
Like Nascar was explaning, you would have an issue with paralax if you sight in at 25yd and take a shot at say, 200yd.

Sight in at 100+
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Old 11-08-2013, 18:38   #5
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Most of the ballistics tables ASSUME the center of the scope is 1.5" above the bore. I do not own ANY rifles with a 1.5" distance of the sights above the bore. some are 1.2 others are 2.5" higher than the bore. If you sight in at 25 yds with the scope 2.5" high over the bore that bullet (55gr SP @2800FPS) is still going higher at 100 yds. It'll be 5.5" high @100yds and 7.6" high @200yds. It'll return to zero a little after 300 yds. I don't think you want that. So, sight it in at the max range you will be shooting. Here is a great ballistics calculator from Hornady. All you need to know is the ballistic coefficient of the bullet and the velocity at the muzzle to calculate its trajectoery.
Ballistics Calculator - Hornady Manufacturing, Inc
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Old 11-08-2013, 18:38   #6
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Most of the ballistics tables ASSUME the center of the scope is 1.5" above the bore. I do not own ANY rifles with a 1.5" distance of the sights above the bore. some are 1.2 others are 2.5" higher than the bore. If you sight in at 25 yds with the scope 2.5" high over the bore that bullet (55gr SP @2800FPS) is still going higher at 100 yds. It'll be 5.5" high @100yds and 7.6" high @200yds. It'll return to zero a little after 300 yds. I don't think you want that. So, sight it in at the max range you will be shooting. Here is a great ballistics calculator from Hornady. All you need to know is the ballistic coefficient of the bullet and the velocity at the muzzle to calculate its trajectoery.
Ballistics Calculator - Hornady Manufacturing, Inc
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Old 11-08-2013, 19:40   #7
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25 yards is good for battle sight zero on an AR. Your going to need to figure out what's right for your mini. I also live in central Florida. Typically a 100 yrd zero and figure out 200 and 300. I can't see any distance past that. Learn your hunting grounds and find the medium distance you will most likely take a shot.

Find battle zero on the mini and you should be within 2" any shot you take here in the flower state.

I have my AR at battle zero, 25/300 and my mini 30 at 50/200. Perfect for FL.
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Old 11-08-2013, 20:39   #8
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Hi new guy;

Here's a ballistics calculator that lets you input your BC and scope/sight offset then does the computations: Handloads.Com Ballistic Calculator

FWIW I use the 36 yd zero, same as on my AR. Second crossing with M855 green tips is going to be about 300m. Better if you can use known distance ranging and then calculate your own ballistics tables based on experimental data (i.e. shoot groups at 20 yds, 50 yds, 100 yds, 200 yds, etc and record your data).

Good luck and enjoy your mini 14!

Best,
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Old 11-08-2013, 21:18   #9
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I forgot to add to my post that you also need to measure the height of the center of the scope above the center of the bore (in addition to the BC and velocity) to get the trajectory.
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Old 11-09-2013, 00:14   #10
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Originally Posted by Hellgate View Post
I forgot to add to my post that you also need to measure the height of the center of the scope above the center of the bore (in addition to the BC and velocity) to get the trajectory.
I think I basicly said that in post #3.
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Old 11-09-2013, 08:08   #11
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I put a GG&G rail on my ranch and sighted in at 25yds

BUT then, I backed off to 100 yds to check the table assumptions for centerline height calculations and they were very close indeed. Because of the rail, scope center is like 2.5" above the bore as I recall, and the impact at 100 was 5 inches and change. I did adjust the poi down as I will never shoot the mini past 200 at a coyote. Always benchmark at 100 yards after a 25 yard sight in.
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Old 11-10-2013, 09:50   #12
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Thamks guy i'll sight it at 100 yds
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