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4000 fps in a 7mm STW w/140 Bullet?

 
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  #22  
Old 03-08-2013, 05:16 AM
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Re: 4000 fps in a 7mm STW w/140 Bullet?

he wouldnt be even touching my guns!
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  #23  
Old 03-08-2013, 11:36 AM
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Re: 4000 fps in a 7mm STW w/140 Bullet?

Quote:
Originally Posted by Fiftydriver View Post
My 7mm Allen Magnum which is based on an improved 338 Lapua parent case will outrun the 7mm RUM by 175 to 200 fps. It will out pace the STW by solid 225 to 250 fps and it will top out at right around 3700-3750 fps with the 140 gr Accubond.

This guy that is telling you he is getting 4K with a 140 gr bullet in the STW is, for lack of a better term, FULL OF IT!!! Maybe he was shooting a 100 gr bullet weight, even then I bet he would be blowing primer pockets if he got to 4000 fps.
honestly, I'd have never believed that you could have gotten 3700fps with a 140 grain bullet out of the Allen Mag as well. Do you have any problems with bullets holding together on impact? For sure you'd have to use a bullet with a heavy jacket thickness
gary
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  #24  
Old 03-08-2013, 12:05 PM
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Re: 4000 fps in a 7mm STW w/140 Bullet?

Quote:
Originally Posted by Trickymissfit View Post
another major problem with driving most of the 7mm bullets that fast is that they'll probably explode after a couple inches of impact on something like a deer. Just not made for those kind of velocities
gary

+1

Years ago I built a rifle in 7 STW for velocity. It had a 31" barrel with a 1 in 10 twist.

I used the 140 grain bullets because at the time A Squair had a load that was advertised at 3550
ft/sec.(They later cooled it down to 3500 ft/sec).

I reached 3800 ft/sec but accuracy went to hell with anything over 3650 ft/sec. I did some very
close test on paper (10 yrds) because I suspected bullet problems, and found out that the bullets
were coming apart at somewhere around 3650 ft/sec (Shedding the jackets).

I tried the monolithic bullets and they gave problems at these velocities also so I decided to back
off and settled for 3600 ft/sec and was very pleased with accuracy and performance with the two
bullets I used (140gr partitions at 4 to 500 yards and in and the ballistic tip for shots over 500 yards).

I had to use a drop tub for the powder I used to keep from breaking the grains due to compressed
charges of very slow powder. (H 5010).

With less twist you might reach 3800 ft/sec with the right setup but it is doubtful. I recommend a
1 in 9 twist for the STW and it works well with any bullet up to 3550 ft/sec.

Velocity is like gas mileage, some like to exaggerate.

J E CUSTOM
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Last edited by J E Custom; 03-08-2013 at 02:41 PM.
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  #25  
Old 03-08-2013, 12:11 PM
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Re: 4000 fps in a 7mm STW w/140 Bullet?

this guys not from texas is he? if so i had a 7stw from him and he says 4000 fbs and 3700 ft/sec and that is more than possiblie with one of there guns. he also builds a 257 stw that gets 4011 ft/sec with a 100 gr ttsx.oh and he does't think much of a 270 because of the bullets that are out there. not defending him but this is how he thinks of himself.
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  #26  
Old 03-08-2013, 04:08 PM
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Re: 4000 fps in a 7mm STW w/140 Bullet?

Could you get 4000 fps with smooth bore or very loose bore? Wonder if he builds his own barrels or takes a good and ruins it. LOL
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  #27  
Old 03-08-2013, 08:08 PM
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Re: 4000 fps in a 7mm STW w/140 Bullet?

Quote:
Originally Posted by elktaxi1 View Post
this guys not from texas is he? if so i had a 7stw from him and he says 4000 fbs and 3700 ft/sec and that is more than possible with one of there guns. he also builds a 257 stw that gets 4011 ft/sec with a 100 gr ttsx.oh and he does't think much of a 270 because of the bullets that are out there. not defending him but this is how he thinks of himself.

Anything is possible but the results may not be desirable for long range, And most large bullets will
not hold up at those velocities. (The larger the bullet, the more centrifugal force on the bullet jacket
and the more starting inertia because of the weight causing the rifling to engage poorly, effecting
accuracy.

Velocity is like gas mileage, some people like to stretch the truth about it.

J E CUSTOM
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  #28  
Old 03-08-2013, 08:36 PM
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Re: 4000 fps in a 7mm STW w/140 Bullet?

Quote:
Originally Posted by Trickymissfit View Post
honestly, I'd have never believed that you could have gotten 3700fps with a 140 grain bullet out of the Allen Mag as well. Do you have any problems with bullets holding together on impact? For sure you'd have to use a bullet with a heavy jacket thickness
gary
it will do it no problem but yes bullet selection is an issue. Remember that I do not recomment the 7mm Allen Magnum for hunting under 400 yards. If someone wants a rifle for 0 to say 600 yards, there is no reason to use anything close to this range of performance. That said, when used on light medium game, the 140 gr Accubond works pretty well.

I recommend that the 7mm Allen Magnum be used with at least a 160 gr bullet weight (3450-3500 fps) or heavier which is where the 7mm AM really runs well at with these heavy bullets.

Of course proper bullet selection needs to be choosen for the job at hand. Bullet selection is far more important when using these ultra performance chamberings then it is with lesser chamberings.
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