Handload for a 308 Win & 20' Barrel

[31B]

Does anyone have any good data for a 308 Win out of a 20" Barrel?

I'm using Lapua brass and 175 gr HPBT and 210M primers and OAL of 2.8". I have not had much luck w/ N150 or N550. I would like to get out to 600 Yards w/ this particular rifle. Any suggestions as to other powders or primers that others have had success with would be appreciated.

Regards,
31B

 

[memilanuk]

Varget. Somewhere between 44 and 46 grains of it, probably around 45. Good stout load, works well in a fair number of .308's.

 

[MLC]

Varget and IMR 4064 have shot nicely in my 20".
4064 gives a bit more velocity which will be to your advantage at 600.
I was getting around 2550 with 4064 and 2485 with Varget.

 

[SF340Driver]

F210M / Lapua case / 44.5 RL-15 / 155 Scenar / 2925fps -- I've shot this load in 110 degree heat and had no signs of pressure.
F210M / Lapua case / 43.5 RL-15 / 175 SMK / around 2700fps

I shoot these from a 22" Mike Rock barrel and will easily make it out to 1000 yds. With a 20" barrel I would look into the 155 Scenar. It's easier to get them up to speed out of a shorter tube.

 

[31B]

Everyone, thank you for the suggestions.

SF340Driver, I think that I'll give RL15 the next try. After I made the post I realized that I was a little unclear as to barrel length. The exposed length of the barrel is 20". I believe the threads for a REM 700 is 1 1/16" so the total length of my barrel is 21 1/16". I am encouraged to hear that 1000Yds is realistic w/ a 22".

Regards,

31B

 

[Alaskaman]

Does anyone have any good data for a 308 Win out of a 20" Barrel?

31B

Hi,

here my 20 inch loads :

Lapua Scenar 155 gr, 46,5 gr. Varget, Win.brass, CCI BR2, average 2683 fps

Hornady A-Max 168 gr, 41,6 Accurate 2230, Lapua brass, CCI BR2, average 2624 fps

regards

Alaskaman

 

[Kodiak99317]

20" barrel on M700

45.0g Varget 175 MK 210M 2.8 OAL 2722 fps.
43.og IMR-4064 175 MK 210M "just touching" 2706 fps.

 

[jb1000br]

I would run either the 175 or 155 with 41-44gns of benchmark...

JB

 

[31B]

I appreciate the suggestions. I tried RL-15 this morning and it looks promising.

Regards,

 

[pierce]

id try 42 grains of Re 15 with Winchester cases with a 168 grain Sierra Matchking. I shot my new remington xr100 in a .308 and got less than half inch groups at a hundred yards every time

 

[sling_n_glove]

My M-1A has a 22-inch barrel but 44 grains N-140 with a moly-coated MatchKing 175, Winchester case and Winchester primer works really well. Groups less than 4 inches at 500 yards.

 

[chino1969]

What rate of twist would you guys advise for a .308 shooting:
1) 110 to 155 grn. bullets
2) 155 up to and including 175 grn. bullets?
Thanx in advance,
Chino69

 

[sling_n_glove]

A lot of people swear by 1-12 twist barrels for bullets in the 147 to 168 range. I have a 1-10 right now that does nicely with 175s but I think it's actually too fast for them. The word amongst locals that shoot the 175 long range is that 1-11 is the way to go. I'll try one of them next. I really don't like the 155s in the 1-10.

As for the light bullets, check out the 30BR page in the left column. It's really interesting and has twist rate suggestions.

http://www.6mmbr.com/30BR.html

If you are shooting across-the-course, try the 175s. They're excellent and the one bullet will do it all from 200 yards to 1000.

 

[memilanuk]

Chino,

1) 13 or even 14 twist. I think some of the Hunter Benchrest guys might use slower than that w/ their light match bullets.

2) 10-12, probably 12. I've shot 155's out of a 1-10" no problem in the accuracy dept, and 190's out of a 12 twist. Anywhere in btwn 10 and 12 for 155-190gr... and I think the 'difference' is going to be more in between your ears than anything.

 

[sewwhat89]

Chino,

1) 13 or even 14 twist. I think some of the Hunter Benchrest guys might use slower than that w/ their light match bullets.

2) 10-12, probably 12. I've shot 155's out of a 1-10" no problem in the accuracy dept, and 190's out of a 12 twist. Anywhere in btwn 10 and 12 for 155-190gr... and I think the 'difference' is going to be more in between your ears than anything.

Would a 1:13 vs a 1:11 give you better velocity,in theory) assuming all else equal? Just curious.