close
Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Long Range Scopes and Other Optics

Long Range Scopes and Other Optics Nightforce Optics

Reply

1" or 30mm performance difference

LinkBack Thread Tools Display Modes
  #1  
Unread 08-04-2009, 07:52 AM
Bronze Member
 
Join Date: Jun 2008
Posts: 79
1" or 30mm performance difference

Is there a difference in performance between a 1" or 30mm scope tube?

1" = 25.4 mm
Reply With Quote

  #2  
Unread 08-04-2009, 08:28 AM
Platinum Member
 
Join Date: Oct 2005
Location: Michigan
Posts: 2,232
Re: 1" or 30mm performance difference

The difference in size is the area of the objective (2*pi*r*r)

1" diameter = 1013sq mm
30mm dia = 1423 sq mm

Nearly a 50% increase in lens area.

Whether that makes a difference depends on a lot of factors (magnification, hunting situation, shooters age ...)

AJ
__________________
If some is good and more is better, then too much is just right.


My mind is a raging torrent, flooded with rivulets of thought, cascading into a waterfall of creative alternatives
Reply With Quote
  #3  
Unread 08-04-2009, 10:53 AM
Bronze Member
 
Join Date: Jun 2008
Posts: 79
Re: 1" or 30mm performance difference

AJ,

Lets see if we are talking apples and apples.

The objective, to me, is the firing end lens on the scope. I have decided upon on a 50mm Objective lens for the 7mm STW I am building - Sako 75 with Tapered Dovetail scope mount.

The 1" or 30mm performance question refers to the area where the scope rings will attach. The scope I will purchase will be Leupold VX-3 - 50MM objective lens. I have to decide upon 1" or 30mm where the rings will mount the scope.

I have a Leupold VX-III 4.5X14 40mm Long Range with a 30mm tube mounted on my 30.06 and really like it.

I suppose I will need to determine if lenses are in that ring mount area. Good point on the total lens area. I can see where that would help low light transmission.

Thanks.

Last edited by Nvhunter; 08-04-2009 at 10:57 AM.
Reply With Quote
  #4  
Unread 08-04-2009, 01:25 PM
Platinum Member
 
Join Date: Oct 2005
Location: Michigan
Posts: 2,232
Re: 1" or 30mm performance difference

Yep, I had a senior moment this morning when I read your post (no sleep etc etc.)

The biggest thing you will typically gain with the larger tube is
1) more adjustment (more windage adjustment when your elevation is at/near it's maximum)
2) A bit stiffer tube.

AJ
__________________
If some is good and more is better, then too much is just right.


My mind is a raging torrent, flooded with rivulets of thought, cascading into a waterfall of creative alternatives
Reply With Quote
  #5  
Unread 08-04-2009, 02:12 PM
Bronze Member
 
Join Date: Jun 2008
Posts: 79
Re: 1" or 30mm performance difference

AJ,

Got it, Thanks. I'll have to learn about this turret adjustment stuff. Always having shot .30 cal ...Well, there really is no need for me to adjust the sights. Just a bit of Kentucky windage has always put food in the fridge.

However, I am sure moving to a distance capable cartridge (like this 7stw) will surely teach me a thing or two. I am really looking forward to range time with it.

Thanks for the feedback.
Reply With Quote
  #6  
Unread 08-05-2009, 09:43 PM
Silver Member
 
Join Date: Apr 2009
Location: Valley County, ID
Posts: 308
Re: 1" or 30mm performance difference

Actually, the 30mm tube being stiffer than the 1" tube is a myth for the most part...you will be hard pressed to find a manufacture that would stick by that vcaim. The only measurable difference between a 30mm and 1" tube is a greater range of adjustment.
Reply With Quote
  #7  
Unread 08-05-2009, 09:55 PM
Platinum Member
 
Join Date: Oct 2005
Location: Michigan
Posts: 2,232
Re: 1" or 30mm performance difference

Quote:
Originally Posted by fireroad View Post
Actually, the 30mm tube being stiffer than the 1" tube is a myth for the most part...you will be hard pressed to find a manufacture that would stick by that vcaim. The only measurable difference between a 30mm and 1" tube is a greater range of adjustment.

Actually, I believe it's a fact that mechanically, larger tubes (with same wall thickness) will be stiffer than smaller tubes. If it's a myth, then all the guys building mountain bikes have bought into the myth too.

AJ
__________________
If some is good and more is better, then too much is just right.


My mind is a raging torrent, flooded with rivulets of thought, cascading into a waterfall of creative alternatives
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Similar Threads for: 1" or 30mm performance difference
Thread Thread Starter Forum Replies Last Post
real performance difference between 178 and 208 amax backyardsniper Long Range Hunting & Shooting 2 06-28-2011 12:25 PM
18" vs 20" barrel difference ??? Alfred Crouch AR15/10 Rifles 5 04-28-2011 11:27 AM
.204 "long" range performance JF7mmRUM Long Range Hunting & Shooting 7 01-31-2011 09:56 PM
WTS *NEW* US Optics rings Mounts 88" Height 3/4" thick 30mm P6M-3000-XL PK_IN_KC Optics For Sale 3 11-04-2010 04:59 PM
Improving long range performance for my "standard" stuff grit Rifles, Bullets, Barrels & Ballistics 10 11-25-2007 12:27 PM


All times are GMT -5. The time now is 05:52 PM.


Powered by vBulletin ©2000 - 2016, Jelsoft Enterprises Ltd.
Content Management Powered by vBadvanced CMPS
All content ©2010-2015 Long Range Hunting, LLC