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Velocity question, 26-in barrel

 
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  #1  
Old 05-03-2014, 08:24 PM
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Join Date: Oct 2013
Posts: 50
Velocity question, 26-in barrel

Sorry if this has been discussed, I read a lot of the posts here, but the thread
with 4000 posts I haven't finished !

I have two new take-off 26" STW barrels I got on Gunbroker (Rem700).
My plan is to dedicate this gun to shooting 160-gr bullets. ( I shoot 140-grainers
out of my 7 RM.) If I get a 7 RUM it will only see 175-180 grainers.

So my question is, if I want more velocity than the factory ammo, how fast
can I expect to get, keeping the barrel at 26" and the bullet at 160-gr ??

I may get a longer STW barrel way down the road, but for now this is the
package I'm going to work with.

Thanks All !
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  #2  
Old 05-04-2014, 05:13 AM
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Location: Wolfesville, MD
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Re: Velocity question, 26-in barrel

there are some cartridges that we can't match advertised velocity. but make no mistake accuracy is more important than 100fps. I found one for my rifle and the loading books said 3100fps but with a Magneto V2 chrono its only getting 2976fps but when it shoots like this who cares

The single shot is from a 6.5 rifle which was my aiming point and three above is from my 7STW

Velocity question, 26-in barrel-img_1561.jpg
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  #3  
Old 05-04-2014, 03:36 PM
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Location: Alabama
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Re: Velocity question, 26-in barrel

The 7mm RUM is not really all it's cracked up to be, and I don't see it with any gains over the 7mm STW. I push 180's out of my 26" 7mm STW right at 3,000 fps, and it puts 5 inside a dime @ 100 yards. What more could you ask for?
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"Give me a minute...I'm good. Give me an hour...I'm great. Give me 6 months...And I'm unbeatable." - Col. Hannibal Smith

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Quote:
Originally Posted by WildRose View Post
The 284 is to the STW what a tricycle is to a Ninja.
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  #4  
Old 05-05-2014, 06:50 AM
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Re: Velocity question, 26-in barrel

The 7rum vs 7stw has twice the boiler room change of the 280 and 280 ai yet nearly everyone dumps on the 7rum.

Just had to toss that in there about the 280 as I know you like the 280ai so much Muddy!!

I'm able to get a bit more from my 7rum than my 7stw but I'm actually shooting 140's in both at present since my heavy bullet load is flaky. With the 171 Barnes the 7rum was at start load at faster speed (3130 fps) than the stw was topped out (3100 fps). Unfortunately the Barnes isn't handling the speeds well in either rifle, so I'll have to play with other heavies.
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  #5  
Old 05-05-2014, 07:45 AM
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Re: Velocity question, 26-in barrel

Quote:
Originally Posted by Lefty7mmstw View Post
I'm able to get a bit more from my 7rum than my 7stw but I'm actually shooting 140's in both at present since my heavy bullet load is flaky. With the 171 Barnes the 7rum was at start load at faster speed (3130 fps) than the stw was topped out (3100 fps). Unfortunately the Barnes isn't handling the speeds well in either rifle, so I'll have to play with other heavies.
Have you tried .284 Caliber Bullets Custom Built for Accuracy | Matrix Ballistics VLDs in 168 or 190?

Good luck!
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  #6  
Old 05-05-2014, 08:23 AM
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Join Date: Oct 2008
Location: Alabama
Posts: 5,743
Re: Velocity question, 26-in barrel

Quote:
Originally Posted by Lefty7mmstw View Post
The 7rum vs 7stw has twice the boiler room change of the 280 and 280 ai yet nearly everyone dumps on the 7rum.

Just had to toss that in there about the 280 as I know you like the 280ai so much Muddy!!

I'm able to get a bit more from my 7rum than my 7stw but I'm actually shooting 140's in both at present since my heavy bullet load is flaky. With the 171 Barnes the 7rum was at start load at faster speed (3130 fps) than the stw was topped out (3100 fps). Unfortunately the Barnes isn't handling the speeds well in either rifle, so I'll have to play with other heavies.
Was that the 171 Match Burners?

If your STW was topping out around 3100 with 140's, something is wrong... My STW pushes 180's right at 3K, and I'm still climbing the velocity ladder to see if I can get higher while staying in that node.
__________________
"I'm just a peckerwood who lives in the hills with too many guns..." - Bob Lee Swagger

"Give me a minute...I'm good. Give me an hour...I'm great. Give me 6 months...And I'm unbeatable." - Col. Hannibal Smith

Ignore everything I say, because I have a reading comprehension and memory problem...

Quote:
Originally Posted by WildRose View Post
The 284 is to the STW what a tricycle is to a Ninja.
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  #7  
Old 05-05-2014, 12:00 PM
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Join Date: Oct 2013
Posts: 50
Re: Velocity question, 26-in barrel

After more reading, it seems 3200 f/s is hard to beat out of factory rifles
with any 160 gr bullet, as a round number. I'm not trying for world record
velocity of course, just seeing how big the performance envelope is.

Wouldn't it be interesting if there was something like nitrous oxide for ammo.....
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