Go Back  HuntingNet.com Forums > General Hunting Forums > Big Game Hunting
Question on sighting in rifle >

Question on sighting in rifle

Big Game Hunting Moose, elk, mulies, caribou, bear, goats, and sheep are all covered here.

Question on sighting in rifle

Old 10-01-2002, 09:41 AM
  #1  
Thread Starter
 
Join Date: Feb 2003
Location: Boulder CO USA
Posts: 12
Default Question on sighting in rifle

Hello all: I am new to (posting) on this board, but have enjoyed reading other posts and gaining valuable information from all the experts out there. Question about sighting in my rifle: I have it set to shoot groups at about 1.5 to 2 inches high at 100 yards (which is the way I like it), but sighted it this way shooting 150 grain nosler partition bullets. What effect will shooting 180 grain NP bullets now have on my accuracy? Any? The reason is I found a mail order service that I can get them cheaper (but they only sell the 180 grain), and, all things being equal, would rather save the money. For what its worth, I am shooting a 7mm Rem Ult. Mag for the upcoming elk season. Thanks in advance.
Billy Bowman is offline  
Old 10-01-2002, 11:46 AM
  #2  
Typical Buck
 
rather_be_huntin's Avatar
 
Join Date: Feb 2003
Location: Cedar Valley Utah
Posts: 977
Default RE: Question on sighting in rifle

I shoot a 7mm mag and my rifle also loves 150 gr partitions. I have 175 gr partitions that I shoot out of it and the only thing I don't like is the lower velocity. They will drop considerably more and faster and you will have to resight your rifle and learn how the new load shoots. If I were you I would stick with the 150's especially since you've got it where you like it.
rather_be_huntin is offline  
Old 10-02-2002, 10:35 PM
  #3  
Giant Nontypical
 
skeeter 7MM's Avatar
 
Join Date: Feb 2003
Location: Saskatchewan Canada
Posts: 6,921
Default RE: Question on sighting in rifle

I would say you'll loose about 1/2 an inch in drop and 300 fps MV. As far as accuracy i can't seeing them being more than 2", all things being equal. Do you need to go up, no. However if you want to save the money, then why not. Just practice with 180's and see what happens!

skeeter 7MM is offline  
Old 10-03-2002, 10:00 AM
  #4  
Typical Buck
 
rather_be_huntin's Avatar
 
Join Date: Feb 2003
Location: Cedar Valley Utah
Posts: 977
Default RE: Question on sighting in rifle

Skeeter 7mm, the 180 is heavier and you will have a lower muzzle velocity so yes it may only be 1/2 inch difference at say a 100 yards. But the 180 is going to continue drop much faster than the 150 and when you starting talking about 300 to 400 yards the drop will hit 5 to 8 inches more and finally at 500 yds it will have about 12 inches more drop than the 150's. In my opinion that is a big difference and not worth a small savings.
rather_be_huntin is offline  
Old 10-03-2002, 12:21 PM
  #5  
Nontypical Buck
 
Join Date: Feb 2003
Location: Kerrville, Tx. USA
Posts: 2,722
Default RE: Question on sighting in rifle

In some ways we are comparing apples and oranges. Are you talking reloads or factory ammunition? If factory, which brand and what is the muzzle velocity of each. Then you have to look at the balistics charts and see what you have. For instance, looking at Remington balistics tables for their 160 grain vs. their 175 grain, if you sight the 175's in at 2.5 inches at 100 yards, they will only drop 2 inches more at 400 yards (past which almost nobody should be shooting at an elk) than the 160's and you can hold dead on for almost up to 300 yds. All things being equal, if I had my druthers, I would prefer 175 grain hitting that bull than 150. Not to say that 150 is not an EXCELLENT choice, but the 175 will perform better in less than optimal conditions/angle of impact/hitting big bones etc.

Bottom line is that the cost difference in negligable when you look at the cost of an elk hunting trip. Buy a couple of boxes and try them. I would shoot whichever groups better and you feel more confident with. On that note, it is kind of late to be changing loads for this year unless you go shoot the new ammo quite a few times, which negates the cost savings. You really can't go wrong with either but if I shot both bullets equally acurately and without flinching at the bigger bullet, I would choose the 175-180 gr.
txhunter58 is offline  
Old 10-03-2002, 01:13 PM
  #6  
 
Join Date: Feb 2003
Location: Gunnison CO USA
Posts: 197
Default RE: Question on sighting in rifle

Yep...I'm w/txhunter. If you are shooting factory loads, just go to the manufacturers site and download the ballistics chart. Then get back out there and re-sight that puppy with the loads you intend to use. Getting off a good shot in real world hunting conditions requires that you have a gun that is performing the way you want it to. A gun that isn't dead-on on the bench sure isn't going to do much for you in the field where shooting situations are almost infinitely variable. (and a lot damned tougher)

"Friend of Men, Lover of Women, Purveyor of the Brutal Truth"
Beans Morocco is offline  
Old 10-03-2002, 02:20 PM
  #7  
Typical Buck
 
rather_be_huntin's Avatar
 
Join Date: Feb 2003
Location: Cedar Valley Utah
Posts: 977
Default RE: Question on sighting in rifle

txhunter58, I agree with you except that in your example you compared 160's vs 175's. There is only a 15 grain difference there. He is talking about a 30 grain difference using the same bullet and my experience has taught me that he will probably not like the performance difference and it will be noticeable. You're right about the on game performance, it will probably be better but the ballistics will change quite a bit. I like your point about having to shoot many rounds to get used to the difference. You usually spend a lot on practicing when changing rounds.
rather_be_huntin is offline  
Old 10-03-2002, 03:43 PM
  #8  
Giant Nontypical
 
skeeter 7MM's Avatar
 
Join Date: Feb 2003
Location: Saskatchewan Canada
Posts: 6,921
Default RE: Question on sighting in rifle

rather be, I was only refering to his POI and accuracy at sight in at 100 Yards. Obviously 180 is going to drop more the farther you get out. However I read his question that he was concerned about sight in and the accuracy effect a 180 would have!

I agree I wouldn't save money on any hunt, i buy what performs the best.

skeeter 7MM is offline  
Old 10-03-2002, 08:25 PM
  #9  
Nontypical Buck
 
Join Date: Feb 2003
Location: Kerrville, Tx. USA
Posts: 2,722
Default RE: Question on sighting in rifle

Rather: You are correct of course, but my point is that a 175 bullet(only 5 grains different than a 180) has an acceptable balistics curve sighted in at 2.5-3 inches high at 100 yards, so downrange drop is not that big an issue.
txhunter58 is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Herron
Guns
14
06-07-2006 01:00 PM
geterdun
Whitetail Deer Hunting
16
11-18-2005 09:43 AM
jtr343
Guns
12
02-17-2005 07:25 AM
TXhunter2
Guns
9
12-03-2003 09:38 PM
bigredneck
Whitetail Deer Hunting
5
11-12-2002 08:11 PM

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off


Quick Reply: Question on sighting in rifle


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.