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Re: Scope question [Re: Leftlane] #6995046
09/19/20 11:21 PM
09/19/20 11:21 PM
Joined: Dec 2006
Posts: 34,144
Minnesota
330-Trapper Offline
trapper
330-Trapper  Offline
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Posts: 34,144
Minnesota
Originally Posted by Leftlane
They have phone apps that will do all the math for you now.

It won't help me....to Old syndrome grin


NRA and NTA Life Member
www.BackroadsRevised@etsy.com




Re: Scope question [Re: Mike in A-town] #6995176
09/20/20 07:28 AM
09/20/20 07:28 AM
Joined: Mar 2012
Posts: 2,346
meadowview, Virginia
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EdP Offline
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meadowview, Virginia
I have several second focal plane scopes that are equipped with subtended reticles (Vortex and Leupold). A graphic showing the mil/moa dfference for each subtension as compared with the crosshairs (at max magnification) was available on line from each mfg's site.

Re: Scope question [Re: Mike in A-town] #6995187
09/20/20 07:37 AM
09/20/20 07:37 AM
Joined: May 2012
Posts: 4,567
michigan,USA
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seniortrap Offline
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seniortrap  Offline
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Posts: 4,567
michigan,USA
In measuring degrees there is a reference. Using a circle at 360 degrees.

For every inch (1) a degree is .0175". That's of an inch. 12 inches of one degree measures .21".

One degree at 120 inches its 25.2" So at 100 yards a degree is moving 63 feet. 1/4 moa is 15.75.

Now everyone can figure that out further.

Last edited by seniortrap; 09/20/20 08:05 AM.

Vietnam--1967 46th. Const./Combat Engineers

"Chaotic action is preferable to orderly inaction."
"After the first shot, all plans go out the window!"
Re: Scope question [Re: Mike in A-town] #6995264
09/20/20 09:28 AM
09/20/20 09:28 AM
Joined: Sep 2013
Posts: 7,185
Green County Wisconsin
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GREENCOUNTYPETE Offline
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Green County Wisconsin
Originally Posted by Mike in A-town
Yes Pete, that's it. And I am using the MRAD reticle with the dot in the center... I believe it's reticle #1 in the link you shared.

Mike

being digital I am not sure the conventional rules apply the same

as a second focal plane unless otherwise stated generally highest magnification is where the recital is calibrated

I think I would set up a calibration square of say 30 centimeters place that at 100 meters and then proceed to see how the calibration actually is in the scope


America only has one issue, we have a Responsibility crisis and everything else stems from it.
Re: Scope question [Re: Mike in A-town] #6995289
09/20/20 10:05 AM
09/20/20 10:05 AM
Joined: Jan 2011
Posts: 2,923
Indiana
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keystone Offline
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Indiana
Originally Posted by Mike in A-town
Originally Posted by keystone
So you have to think about the target changing size as you increase and decrease the magnification, the reticle does not change size. When your sighting in for 700yds you have to use the exact holdover mark at the exact magnification that you will always use at that particular distance. The distance between your holdover marks stays the same since your reticle doesnít change size but your target gets much larger at higher magnification.




I think I understand what you're saying. Here's what I'm trying to wrap my head around...

When I zoom from 4x to 32x my target gets 8 times bigger. This was evidenced by my little 5 yard experiment.

Now if I'm at 700 yards and using 4x power and hitting with 5.5 mils of holdover and I zoom to 32x my target is now 8x bigger than it was at 4x. So is it correct to think that I would divide my 5.5 mil holdover by 8 to account for that? The math would seem to make that right but that's assuming it's proportional.

Or is it easier/more accurate to move back to 100 yards and rezero at 32x and go from there?

Mike


Like you said as long as your holdoverís are proportional that would make sense but i would definitely think it would be easier to move back and zero at 32 power, or whatever power you would feel you would use from say 300 out to 700. SFP is perfectly fine when adjusting with the turrets, when using the holdover it becomes a pain in the butt, especially because the holdovers donít account for wind. Instead of having a 4-32 power scope itís like you have a 4 power and a 32 power. Or a 4 power and whatever other power you choose. Thereís to much complication in between.

Re: Scope question [Re: Mike in A-town] #6995291
09/20/20 10:07 AM
09/20/20 10:07 AM
Joined: Mar 2010
Posts: 2,714
MT
Boone Liane Offline
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Boone Liane  Offline
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MT
Ahhh, an electric scope.

It would not be out of the realm of possibilities to be a true mechanical (or in this case, electrical) issue.

OLED reticle and all.

Re: Scope question [Re: Mike in A-town] #6995293
09/20/20 10:09 AM
09/20/20 10:09 AM
Joined: Mar 2010
Posts: 2,714
MT
Boone Liane Offline
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Boone Liane  Offline
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MT
Personally, Iíve never looked through a FFP scope where the reticle was actually usable across the entire magnification range.

To small and worthless to see at low power, large, cluttered, and obtrusive to the sight picture on high power.

Re: Scope question [Re: robert.d12] #6995333
09/20/20 11:28 AM
09/20/20 11:28 AM
Joined: Feb 2014
Posts: 5,802
Ky
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jbyrd63 Offline
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Ky
Originally Posted by robert.d12
Yes, your reticle change as you change the magnification. Usually a reticle is designed for max magnification, but on a 32x scope it might not be. What brand and model is it? You should be able to google what magnification the reticle is set for


WHAT !!! About this time last year I had the same problem but not at that distance and I was told no way. Changing magnification doesn't effect zero....

Re: Scope question [Re: Mike in A-town] #7015052
10/11/20 08:52 PM
10/11/20 08:52 PM
Joined: Sep 2013
Posts: 8,125
Northeast Oklahoma
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Mike in A-town Offline OP
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Mike in A-town  Offline OP
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Northeast Oklahoma
Quick update...

It looks like the biggest problem was the ammo. I stated earlier that I was using Federal American Eagle 150 gr FMJ. They just don't shoot well in the gun. So I worked up some hand loads with Nosler 150 gr. Ballistic Silvertips. Best group was about 1.5" at 100 yards. Still not good enough.

So I researched and asked around. I was told to try heavier bullets so I picked up some Sierra Match King 168 HPBT. I loaded 10 to try out... 5 at the starting load and another 5 loaded at the mid range. Went out and shot them at 100 this afternoon...

Still have to fine tune the load some but the groups were much better. I had a few fliers which is probably me being jerky on the trigger. Without the fliers my groups were about 1/2"

If I can tune the load and keep my groups at 1/2" I'll start working back up to that 700 yard target... 700 is just about the max I can safely shoot at this spot.

I may look into upgrading my trigger too. The factory trigger breaks pretty clean but it feels like it takes about 14 pounds to make it break.

Mike


One man with a gun may control 100 others who have none.

Vladimir Lenin
Re: Scope question [Re: Mike in A-town] #7015111
10/11/20 10:17 PM
10/11/20 10:17 PM
Joined: Sep 2013
Posts: 7,185
Green County Wisconsin
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GREENCOUNTYPETE Offline
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Green County Wisconsin
good to hear it is getting better

I found my 1:10 twist 308 didn't much care for 150 federal either , they were about 2 1/2 inches at 100 yards

this was from bolt action rifles

the 165 and 180 were better


America only has one issue, we have a Responsibility crisis and everything else stems from it.
Re: Scope question [Re: keystone] #7015135
10/11/20 10:47 PM
10/11/20 10:47 PM
Joined: Sep 2013
Posts: 2,489
Nevada
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nvwrangler Offline
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Nevada
Originally Posted by keystone
Originally Posted by robert.d12
Yes, your reticle change as you change the magnification. Usually a reticle is designed for max magnification, but on a 32x scope it might not be. What brand and model is it? You should be able to google what magnification the reticle is set for


On a SFP the reticle does not change, the target does. The reticle is placed behind the magnification lense so it never changes size.



This
First focal plane the reticle changes size
Second focal plane it stays the same size but is normally only correct at the highest magnification for moa or mill

Re: Scope question [Re: GREENCOUNTYPETE] #7015805
10/12/20 06:33 PM
10/12/20 06:33 PM
Joined: Sep 2013
Posts: 8,125
Northeast Oklahoma
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Mike in A-town Offline OP
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Northeast Oklahoma
Originally Posted by GREENCOUNTYPETE
good to hear it is getting better

I found my 1:10 twist 308 didn't much care for 150 federal either , they were about 2 1/2 inches at 100 yards

this was from bolt action rifles

the 165 and 180 were better



It was a substantial improvement.

I have some Hornady 195 gr ELD Match bullets and a pound of CFE 223... I may load up 5 or 10 just to see how well they shoot just for kicks.

Mike


One man with a gun may control 100 others who have none.

Vladimir Lenin
Re: Scope question [Re: Mike in A-town] #7015811
10/12/20 06:41 PM
10/12/20 06:41 PM
Joined: Sep 2013
Posts: 7,185
Green County Wisconsin
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GREENCOUNTYPETE Offline
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Green County Wisconsin
I like to load 180 BTSP but I got a good price on a Few 165 BTSP they work on deer also heck inside 200 I don't know if I or the deer can tell

if this bullet shortage lasts a long time I will be shooting 165 for closer targets and save some 180 for when I feel I need the extra weight

I load H4895 not the highest velocity but works in the M1 , 308 , 223 , 30-30 it does a decent job


America only has one issue, we have a Responsibility crisis and everything else stems from it.
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