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# Lazzeroni velocity?

#1
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.
#2
12-27-2003, 06:49 PM
 PUBLISHER Join Date: May 2001 Posts: 6,518
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?
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#3
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: 3,830
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 ]
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Long range shooting is a process that ends with a result. Once you start to focus on the result (how bad your last shot was, how big the group is going to be, 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.
#4
12-27-2003, 08:53 PM
 PUBLISHER Join Date: May 2001 Posts: 6,518
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]
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#5
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: 3,830
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
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__________________
Long range shooting is a process that ends with a result. Once you start to focus on the result (how bad your last shot was, how big the group is going to be, 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.
#6
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: 3,830
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 (how bad your last shot was, how big the group is going to be, 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.
#7
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.
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