Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Chatting and General Stuff > General Discussion

General Discussion Must wear red or OD green socks to participate. I can't see your socks, please be honest.


Reply

Scope Adjustment

 
LinkBack Thread Tools Display Modes
  #1  
Old 10-22-2012, 01:17 PM
Gold Member
 
Join Date: Apr 2012
Location: Terre Haute In.
Posts: 696
Scope Adjustment

I'm curious about dialing for yardage, I am just getting into the long range game and am not sure of something. I have a custom built 7mm rem mag. I am shooting 168 vld bergers(hunting type). Here is my question the rifle shoots under a half moa out to 800yds. all the range I have right now, I picked up some 140vlds again hunting to try. My 168 are loaded with 68.5 grs. H1000,hornady cases, CCI250 primers. The 140s are loaded with 69grs H1000 same case, fed match primers. the 140's are hitting exactly 1/2" higher at 100 yds than the 168s when I do my drop chart for the 140s can I just take off .5moa from what the program tells me to dial instead of changeing the sight in distance or the corrected velocity validation. I am using xbal from nightforce? Okay now for you guys that I know are going to ask for rifle specs.(lol) here they are.

7mm rem mag
26" krieger barrel 1-10 twist, #10 contour, 10 flutes, stainless.
H S Precision tactical stock, green w/black webbing.
Rem. 700 action completley reworked and accurized.
Jewel trigger set at 1#4oz.
Nightforce scope 5.5-22 with moar reticle, Nightforce rings and bases.
Rifle was built by Jay Cutright,CutrightPrecision Rifles. It shoots very well like I said under half moa out to 800yds and on good days I have shot under 1/4moa out to 600 could probably do a little better but thats all my 63 year old eyes will give me. Any help will be greatly appreciated. Thanks,
I would post a pic of rifle if I could figure that out.

Rick,
Reply With Quote
  #2  
Old 10-22-2012, 01:28 PM
Gold Member
 
Join Date: Jan 2012
Location: Hot Springs, South Dakota
Posts: 505
Re: Scope Adjustment

Quick answer is no.

I doubt that the 140 and the 168 are leaving the barrel at the same speed and have the same BC's.
Reply With Quote
  #3  
Old 10-22-2012, 02:05 PM
Gold Member
 
Join Date: Apr 2012
Location: Terre Haute In.
Posts: 696
Re: Scope Adjustment

Quote:
Originally Posted by JackinSD View Post
Quick answer is no.

I doubt that the 140 and the 168 are leaving the barrel at the same speed and have the same BC's.
No they aren't I know that, I can program that in like I said the 140 are 1/2" high at 100 vs the 168's I know I could keep moving back till the 140's print dead on then use that info but seems like waste of ammo if I can use 100 yds for sight in yardage then use .5 moa less than program calls for when dialing up I would have tried it today when I was shooting but it decided to pour down rain before I got the chance.
Reply With Quote
  #4  
Old 10-22-2012, 03:02 PM
Gold Member
 
Join Date: Jan 2012
Location: Hot Springs, South Dakota
Posts: 505
Re: Scope Adjustment

I maybe answering the wrong question here but......

Why not just change your zero to .5" high at 100 and the program would give you the correct drop chart instead of just subtracting .5 from your drop chart?

Maybe exbal doesn't have that option, I don't use it.

I assume you also know the accurate fps you are getting, as you say you can program that in?

Like I said, maybe answering the wrong question. But, having a hard time making heads or tails of your phrasing of it. Sorry.
Reply With Quote
  #5  
Old 10-22-2012, 03:32 PM
Platinum Member
 
Join Date: Apr 2012
Location: The cold part of Montana
Posts: 1,390
Re: Scope Adjustment

I don't think it's gonna work for you. The 140's have probably a 200fps muzzle velocity advantage, and that's going to cause discrepancy, add in the 140 have a zero 0.5" higher at a 100 it gets even worse on the order of 1.6MOA at 800yrds being the biggest spread, and the 168 with catch up at about 650 anyway
__________________
Keep in mind the animals we shoot for food and display are not bullet proof. Contrary to popular belief, they bleed and die just like they did a hundred years ago. Being competent with a given rifle is far more important than impressive ballistics and poor shootability. High velocity misses never put a steak in the freezer.

Joe
Reply With Quote
  #6  
Old 10-22-2012, 06:46 PM
Gold Member
 
Join Date: Apr 2012
Location: Terre Haute In.
Posts: 696
Re: Scope Adjustment

Quote:
Originally Posted by Joe King View Post
I don't think it's gonna work for you. The 140's have probably a 200fps muzzle velocity advantage, and that's going to cause discrepancy, add in the 140 have a zero 0.5" higher at a 100 it gets even worse on the order of 1.6MOA at 800yrds being the biggest spread, and the 168 with catch up at about 650 anyway
ok,maybe the phrasing was not quit clear enough my bad,the mv on the 168's is 2932, on the 140's about 160fps faster. With no change to scope adjustment the 140 hits 1/2" higher than the 168's @ 100yds. I don't beleive I can put in a +.5 for the zero I think I can do a minus .5moa when I run my numbers, the reason I think this may work I was shooting @ 800yds today with the 168's I had a 1gal milk jug set up with water in it the last shot I took was with the 140's took 1 shot I thought I shot over it as I saw dirt kick up behind jug when I drove down to gather targets I looked at the jug there was a hole right below the cap dead center of the jug which I believe would equal about a half moa for that distance exbal told me to dial 17moa which I did had I dialed 16.5 I think the hit would have been centered. I hope this helps also on a 3 shot group w/ the 168's two holes were less than 1/2" apart probably luck) the third was 2 1/2" to left this was on paper wind was from 9:00 at 3-4 mph I didn't look at the flag at target till after third shot it was hanging straight down would have been heck of a group had I looked at it first. Any way hope this makes more sense.
Rick
Reply With Quote
  #7  
Old 10-23-2012, 10:43 AM
Platinum Member
 
Join Date: Apr 2012
Location: The cold part of Montana
Posts: 1,390
Re: Scope Adjustment

you mean sezro the 140's and use your trajectory card for the 168's and just take off .5MOA when you use the 140's? It'll get you somewhat close Why not just make a dope card for the 140 on say JBM ballistics, it's not hard by any means and you would be on with no guess work at all, be cheaper and a lot more precise as well.

JBM - Calculations - Trajectory μCard

Click on the link correct the values that aren't true for you, hit calculate, copy it to a word document and print it out, oh and bookmark the link too.

I entered 0.5moa high zero also that way you can just print your card and take it to the range and verify it with no other adjustment.
__________________
Keep in mind the animals we shoot for food and display are not bullet proof. Contrary to popular belief, they bleed and die just like they did a hundred years ago. Being competent with a given rifle is far more important than impressive ballistics and poor shootability. High velocity misses never put a steak in the freezer.

Joe
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Similar Threads for: Scope Adjustment
Thread Thread Starter Forum Replies Last Post
Scope Adjustment, Range, and Scope Bases 270 MKV Long Range Scopes and Other Optics 2 09-27-2012 09:59 AM
Tac 15i ran out of scope adjustment Kytopgun PSE TAC 15/15i Crossbow Hunting Forum 2 10-10-2011 11:47 AM
TAC 15 scope adjustment az69ner PSE TAC 15/15i Crossbow Hunting Forum 4 05-02-2011 07:20 AM
Out of scope adjustment gedsar Gunsmithing 10 08-31-2008 12:02 AM
more scope adjustment? dodgefreak8 Long Range Scopes and Other Optics 5 10-25-2005 05:53 PM


All times are GMT -5. The time now is 05:35 PM.


Powered by vBulletin ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Management Powered by vBadvanced CMPS
All content ©2010-2014 Long Range Hunting, LLC