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308 ballistics and lighter bullets.

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/19/2011 at 03:11
8shots View Drop Down
Optics Jedi Knight
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'lord of the flies'

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What is the lightest bullet that would stabilize in a 308 Win?
What speed can you get from this lightest bullet?
Rifle is a 1:10 twist.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/19/2011 at 04:40
Cody.e.Smith View Drop Down
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For the lightest bullets you will have to go with some of the monometallic bullets that are out there.
I have worked with and used GSC bullets in the past with great success.  Here are a few links to their sight


Contact info for here in the states http://www.gscustomusa.com/contact.html

Tony is one of the owners and is a veteran of the Navy and well versed in pretty much all things firearm related and an expert in ballistics and bullet design.

If you are looking to shoot 500m and less, their 137gr SP bullet will work for you with a max speed of 3200fps.  If you want to reach out further than 500m you will have to step up to either their 158 or 167gr SP bullet with a max speed of 3600fps.  

If your weapon is using a detachable box magazine you will need to check what your max OAL is for that mag and make sure the minimum OAL of the 167gr will work since these bullets are much longer than traditional bullets.

If you don't see exactly what you are looking for on their sight, call them and let them know what you want and they will custom make projectiles for you as long as it does not copy another bullet design and it is something that they are sure will work.

I had them make some 115gr projectiles for my .300 whisper that were extra long to stabilize in a 1-8 twist barrel specifically for super sonic shooting.  At a little under 2500fps they held a similar trajectory as a 168gr SMK in .308 out to 480yrds.  They far exceeded all of my expectations. 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/19/2011 at 06:19
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Optics Jedi Knight
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'lord of the flies'

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Thanks for feedback. I am currently using 155gr at around 2850 ft per sec.
We only shoot out to 380 yds. I am looking for SPEED. So thinking lighter bullet, maybe 130 gr or less.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/19/2011 at 07:27
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Optics Jedi Knight
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The lightest are 55 gr .224 bullets used in sabots. Remington markets them under the accelerator name. Usually these chrono between 3600 fps and 3800 fps. Slow twists will stabilize light bullets. Lighter bullets have fewer choices, 110 grs are used alot when using a 308 for  varmint shooting in the states and you can expect around 3000 fps. 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/19/2011 at 08:11
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     Ammo manufacturers use to offer .308 ammo with 125gr bullets (still do in .30-06 I believe).
 
     Here's some 125gr data from Nosler:
     
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/19/2011 at 08:22
Urimaginaryfrnd View Drop Down
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There used to be some Remmington Accelerator bullets that were a .224   55gr in a sabbot that ran just about 4000 Fps  I still have some for 30-06 not sure if they ever made them for .308 but likely.  Point of impact at 200 yds was off about 2 ft high with them. There should be some round nose 90 gr that are really made for 30 carbine but 110 gr should be pretty speedy.
 
Twist of the barrel determines what weight will stabalize properly.

BULLET WEIGHT / CALIBER / TWIST RATE CHART

Grain/Cal .172 .204 .224 .243 .257 .264 .277 .284 .308 .338 .358
17-20 9-10                    
25 10                    
30 9 12                  
33   12                  
35   12                  
37 VLD 6                    
40   12                  
50-52   9 14                
55     12                
60     12                
68-69     9,10 13,14              
75     9   14            
80     8                
85     7 12 12 12          
90     7 10              
100       10 10   12 14      
105-107       8              
120         10 10   12 15,16    
130             10   14    
140           9 10 10      
150                 14    
140-160           8 10 10 12,13    
150-168               9 11,12,13    
150-180                 10,11,12    
160               9      
175               9      
180                 10,11,12    
200                 10,11 10,12 12,16
220                 10    
225                   10,12 12,16
240-250                 10 10 12
300                   10 12


Edited by Urimaginaryfrnd - June/19/2011 at 08:30
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/19/2011 at 08:39
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Optics God
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   Just finished looking thru my odds and ends ammo box and found 4 .308 Win Accelerators(Rem). I've never shot them and have no idea where they even came from.  Anyone want'em I'll send them out.
 
   I also found a 125gr load in my Nosler #4 pushing their BT at 3214 using W748 in a 24" 1-10 bbl.  +3.3" at 100yds puts it -10" 400yds (300yd zero @ 3200fps).
 
   I should add that this was their most accurate load tested.


Edited by 300S&W - June/19/2011 at 08:41
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/19/2011 at 11:06
Cody.e.Smith View Drop Down
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+1  on the idea of the sabots guys.  I rarely think of them for firing through the 30cal.  They are a blast to shoot the 155gr AP 30cal out of a sabot in the .50 Yippee
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/19/2011 at 12:37
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X = 180 Y = 90 (X+Pyro)+(Y-Pyro) = ?

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Lightest I've used is a Sierra 110gr. hollowpoint varminter out of a .300 wby at about 36-3700. They also make a 110 gr. in a prohunter soft point.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/19/2011 at 18:11
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Optics Master Extraordinaire
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The 1:10 twist will help regardless, but usually it's more of a problem to stabilize heavier bullets rather than lighter ones. Check out the stability calculator provided by JBM: http://www.jbmballistics.com/cgi-bin/jbmstab-5.1.cgi

As you'll see, the higher the temperature and the lower the atmospheric pressure the more stability will increase. Of course, while increased speed is generally desirable, I'd recommend doing some comparisons in the JBM ballistics calculator to see how much wind drift you get. The lighter the .308 bullet the worse the BC will get. Also, ramping up velocities will wear the barrel out a little faster.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/20/2011 at 20:01
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I have shot down to the little half jacket 110 grainers out of 308's and 30-06's and they shot fine. Actually I had an old revelation (savage 110) that cloverleafed them at 100yds.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/21/2011 at 11:30
8shots View Drop Down
Optics Jedi Knight
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'lord of the flies'

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Thanks for all the info.I have spoken to GS Custom and ordered some 137 gr. He feels going lighter will cost on the B/C side.
I should get around 3100 out of them.
I will keep you informed of the performance. Only in about 2 to 3 weeks time, but I will post the results.
 
Thanks again for info and help.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/21/2011 at 12:09
Cody.e.Smith View Drop Down
Optics Apprentice
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I think you will very pleased with the GSC bullets.  Any time you talk to them and let them know what you are trying to accomplish, they will never steer you wrong.
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