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Cz 550 7mm Rem Mag

 
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  #1  
Old 08-06-2014, 02:11 PM
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Cz 550 7mm Rem Mag

Hi everyone, first post for me and looking forward to great advice. I recently bought a CZ 550 7mm Rem mag and it came with a 23.6" barrel, my question is would this length of barrel make much diffrence in velocity when reloading?
Any help would be appreciated.
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  #2  
Old 08-07-2014, 05:33 AM
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Re: Cz 550 7mm Rem Mag

Quote:
Originally Posted by JmarNZ View Post
Hi everyone, first post for me and looking forward to great advice. I recently bought a CZ 550 7mm Rem mag and it came with a 23.6" barrel, my question is would this length of barrel make much diffrence in velocity when reloading?
Any help would be appreciated.
Welcome to LRH and enjoy! Congrats on a very nice rifle and chambering.

Your load combination (powder capacity/burn rate, primer, bullet type, case capacity, etc ...) affects the velocity for your particular rifle.

For instance, in my .270 AI loads, I can get ~100 more FPS using H4831SC over H1000, Win case handles better pressure than RP case, WLR primers are hotter than BR2s, etc ... Others will be here shortly to chime in.

Find the best combination out of your rifle and have fun with it.

Good luck and happy safe reloading, hunting, and shooting. Cheers!

ADDED:

You might also want to check out/join in the regional forum @ http://www.longrangehunting.com/forums/f83/
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  #3  
Old 08-07-2014, 11:05 AM
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Re: Cz 550 7mm Rem Mag

Welcome to LRH.

Excellent caliber, but can't tell you much about the gun, as I am not a CZ guru. However, that does seem to be an awefully short barrel length for a 7mmRM, and will be stunting it's velocity a little. I prefer 26" or longer barrels for magnum calibers, that way you get full potential out of them.

So to answer your question, yes, barrel length + slow burning magnum powders will increase your velocity a good bit.
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Old 08-07-2014, 12:23 PM
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Re: Cz 550 7mm Rem Mag

Thanks for the reply guys, I'll try my hardest to get book velocities with as my combinations as possible. It's just a shame that I didn"t start this thread before I bought a short 7mm!! Any idea what the loss of velocity my be compared to a 24" and 26" barrel?
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  #5  
Old 08-07-2014, 07:08 PM
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Re: Cz 550 7mm Rem Mag

Welcome!
I would estimate around 100fps less than a 26" barrel, it could actually be a little less.
My 264WM with 26" barrel 4 groove Lilja gets over 100fps more than a factory 6 groove Rem 26" barrel. It depends, only a chrony will tell you for sure.

Cheers.
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Old 08-08-2014, 05:07 AM
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Re: Cz 550 7mm Rem Mag

Quote:
Originally Posted by JmarNZ View Post
Thanks for the reply guys, I'll try my hardest to get book velocities with as my combinations as possible. It's just a shame that I didn"t start this thread before I bought a short 7mm!! Any idea what the loss of velocity my be compared to a 24" and 26" barrel?
Extract from Lilja Barrels ...

Quote:
Depending on the powder, cartridge capacity and bullet weight, it is normal to see a maximum additional velocity gain of about 25 fps per inch of barrel. The amount of gain decreases as barrel length increases also.
(Lilja Precision Rifle Barrels)
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  #7  
Old 08-08-2014, 07:05 AM
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Posts: 884
Re: Cz 550 7mm Rem Mag

Quote:
Originally Posted by JmarNZ View Post
Hi everyone, first post for me and looking forward to great advice. I recently bought a CZ 550 7mm Rem mag and it came with a 23.6" barrel, my question is would this length of barrel make much diffrence in velocity when reloading?
Any help would be appreciated.
Most factory rifles come with 24" barrels in magnum chamberings. You aren't going to see a measurable difference with a barrel that is less than 1/2" shorter than most other factory rifles. It's not worth sweating over. Yes you would gain a bit of velocity with a 26" barrel, but the difference isn't really enough to have much effect on downrange performance.

Some chamberings are more sensitive to barrel length than others. The .264WM, for example, really needs at least 26" of barrel to get the most out of it. I don't believe the same to be true of the 7mm RM.
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