Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Rifles, Bullets, Barrels and Ballistics


Reply

Lazzeroni velocity?

 
LinkBack Thread Tools Display Modes
  #1  
Old 12-27-2003, 11:56 AM
Bronze Member
 
Join Date: Dec 2003
Location: Negaunee, Mi
Posts: 51
Lazzeroni velocity?

Can someone tell me how Lazzeroni advertises a velocity of 3,550 fps with a 160gr bullet out of 7.21 firebird when remington says the ultra mag can only muster 3,200 fps with a 160 gr bullet? Dont both have simular case capacities? Lazzeroni says a 27" barrel was used and remington says a 26 was used to obtain the advertsied velocities.
Reply With Quote
  #2  
Old 12-27-2003, 06:49 PM
PUBLISHER
 
Join Date: May 2001
Posts: 5,837
Re: Lazzeroni velocity?

Meichele

I have heard the theory of faster velocities with slower twist barrels. I wonder if anyone has an informed opinion of how much difference this can make?

Let's start with a base muzzle velocity of 3400 with a 9 twist. How much slower would the higher pressures of an 8 twist barrel cause the velocity to be if loaded to the same pressure as in the 9 twist barrel?
__________________


Long Range Hunting Rifles

Long Range Rifles, LLC - Ready To Ship

Components and assembly by LRH Sponsors
Reply With Quote
  #3  
Old 12-27-2003, 08:40 PM
Platinum Member
 
Join Date: Jan 2003
Location: The rifle range, or archery range or behind the computer in Alaska
Posts: 3,515
Re: Lazzeroni velocity?

Len,

I am not sure if you are dissagreeing w/my statments or wondering how much the differance is.

I need to go out and test how much the differance really is.

Quote:

Let's start with a base muzzle velocity of 3400 with a 9 twist. How much slower would the higher pressures of an 8 twist barrel cause the velocity to be if loaded to the same pressure as in the 9 twist barrel?

1st there is stated "higher pressures" then is quoted "the same pressure"

Is this a trick question???!!!
[img]images/icons/smile.gif[/img]

[ 12-27-2003: Message edited by: meichele ]
__________________
Long range shooting is a process that ends with a result. Once you start to focus on the result (where the shot goes, how big the group is, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.
Reply With Quote
  #4  
Old 12-27-2003, 08:53 PM
PUBLISHER
 
Join Date: May 2001
Posts: 5,837
Re: Lazzeroni velocity?

Meichele

No, no, I agree with you. I have always tried to use the slowest twist I could for a given bullet for this very reason.

What I meant to say was that if you use the same powder load you would get higher pressures in the faster twist barrel. But for safety reasons you would then decrease the powder load and end up with slower velocity.

How much slower is the question.

Clear as mud now? [img]images/icons/smile.gif[/img]
__________________


Long Range Hunting Rifles

Long Range Rifles, LLC - Ready To Ship

Components and assembly by LRH Sponsors
Reply With Quote
  #5  
Old 12-28-2003, 12:55 AM
Platinum Member
 
Join Date: Jan 2003
Location: The rifle range, or archery range or behind the computer in Alaska
Posts: 3,515
Re: Lazzeroni velocity?

bwalker,

Lazzeroni cases have much higher case capacities than the RUM cases. Think of them as being closer to the 378 case.

They also use slightly slower twists and longer barrels in their test guns. Slower twist will allow higher velocities w/less pressure.

Regards
__________________
Long range shooting is a process that ends with a result. Once you start to focus on the result (where the shot goes, how big the group is, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.
Reply With Quote
  #6  
Old 12-28-2003, 01:38 AM
Platinum Member
 
Join Date: Jan 2003
Location: The rifle range, or archery range or behind the computer in Alaska
Posts: 3,515
Re: Lazzeroni velocity?

LOL!! [img]images/icons/smile.gif[/img]

Clear as mud!

Yeah, I really neeeeed to get out and test this.
__________________
Long range shooting is a process that ends with a result. Once you start to focus on the result (where the shot goes, how big the group is, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.
Reply With Quote
  #7  
Old 12-28-2003, 04:18 PM
Silver Member
 
Join Date: Dec 2002
Posts: 374
Re: Lazzeroni velocity?

Len, I would guess that the difference would be near impossible to see in testing. I have a brother who's a .223 nut. He's got a bunch of em. Anywhere from 7 twist barrels to 14 twist barrels. There's no discernable difference from one to the other and I don't know how much more spread there can be on the twist. If ever there should be a difference, here's the case. The same loads work in both twists also so I doubt there's a pressure variation either.
__________________
If you have something that you disassemble and reassemble enough times, sooner or later, you'll have two!
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Similar Threads for: Lazzeroni velocity?
Thread Thread Starter Forum Replies Last Post
Has anyone run across a Lazzeroni? Magnum61 Long Range Hunting & Shooting 2 09-17-2010 02:53 PM
WTS lazzeroni learning Guns For Sale 2 01-25-2010 11:30 PM
Lazzeroni ??? asfornea Rifles, Bullets, Barrels and Ballistics 0 11-08-2009 12:51 AM
.22 cal lazzeroni? tbrown9124 Equipment Discussions 1 11-30-2008 09:29 PM
Lazzeroni Sako TRG-S in 7.82 or 7.21 JPG Equipment Discussions 1 08-07-2002 02:43 AM

Current Poll
How Many Different Cartridges Do You Reload For?
ZERO, all factory ammo - 8.04%
359 Votes
1 - 2.78%
124 Votes
2 or 3 - 14.61%
652 Votes
4 or 5 - 20.37%
909 Votes
6 or 7 - 14.86%
663 Votes
8 or 9 - 8.65%
386 Votes
10 or more - 30.70%
1,370 Vote
Total Votes: 4,463
You may not vote on this poll.

All times are GMT -5. The time now is 01:15 PM.


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