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Rem SPS tec 308 accurcy

 
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  #1  
Old 07-08-2013, 09:10 PM
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Rem SPS tec 308 accurcy

My Friend and I went to the range. We tested his Rem SPS Tec 308 20" bbl 1:12 twist rifle. it has a new vortex Viper pst 6-24-50mm (mil)

He reloaded two different bullets, the Berger 155 VLD Hunting, (.439 bc?) and the 155.5 Berger Target VLD with a .483 BC. all groups today was 100 yards.

the Hunting VLD's with less BC shoot well. 3 shot groupings of 0.75 inch, 0.65 inch, .375 inch and 0.195 inch besting my best group of today with my 204 of 0.210 inch.

He is using 45.5 of Varget on both bullets, yet the 155.5 Berger Target bullets group like 2.5 inches at best.


I know his throat on the 308 is so long that he can not get the 155's to touch the rifling with the bullet barley in the mouth of the case.
Not sure why the higher BC Bergers shots like crap and the other one does not.

could it be the higher bc bullet being longer does not have enough spin on them leaving at 2650 fps (chonoed). or is a jump to the lands/rifling too much for the high bc VLD?

I feel bad as I talked him into buying these bullets for his new 308. He wants to be able to shoot to 1000 yards. and with his short barrel, I told him this will be pushing it, and 2650-2700 fps and a a 483 bc bullet would keep him comfortably over super sonic to 1000 yards (1250 fps)

I have some 168 (496 bc) and 185 (547 bc) Hunting Hybrid VLDs I shoot in my 300 winni I may let him try out

Any ideas?
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  #2  
Old 07-08-2013, 09:39 PM
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Re: Rem SPS tec 308 accurcy

scotty- riflemansjournal has a bunch of articles on loading the 308. it is not a 30-06. a 20 inch barrel makes even more challenging to keep super sonic to 1000.
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  #3  
Old 07-08-2013, 09:41 PM
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Re: Rem SPS tec 308 accurcy

some of the low drag bullets have less bearing surface and are more particular about what barrel they are shot in.
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Old 07-09-2013, 03:54 AM
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Re: Rem SPS tec 308 accurcy

Quote:
Originally Posted by roninflag View Post
some of the low drag bullets have less bearing surface and are more particular about what barrel they are shot in.

Thanks for reply-
I know what your talking about, and that did not cross my mind.

It's funny how two bullets from the same manufacturer of the same weight and looks perform so much different. of both 155 (155.5?) VLD's one is .437 bc the other is a .483 bc. for Him to keep supersonic to 1000 comfortably he needs the .483 bc bullet to shoot good. He was dealt a bad hand so to speak.
I think he should try the 168 VLD's. No one has any in stock, but I have a box of 60-65 left over. might be able to seat to touch lands.
Why does Remington have such long throats in such a short action cartridge?
This is something Weatherby used to do, good for velocity (with hotter loads) , poor for accuracy

the 168 with a little less speed starting out and .496 bc will also do well at 1000 from his gun.
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Old 07-09-2013, 09:32 AM
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Re: Rem SPS tec 308 accurcy

some shoot 175's loaded up. the is what the military does.
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  #6  
Old 07-09-2013, 07:28 PM
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Re: Rem SPS tec 308 accurcy

some 210's with 72.5 or re-22 out of the 300 win does real good to 1000.
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  #7  
Old 07-10-2013, 03:34 AM
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Re: Rem SPS tec 308 accurcy

Quote:
Originally Posted by roninflag View Post
some 210's with 72.5 or re-22 out of the 300 win does real good to 1000.

His gun is 308, 20" bbl and 12 twist. a challenge to keep super sonic to 1000 yards. thanks!
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