Reloading 1-10 twist .308 need some help

wco24u

wco24u

Sergeant
Full Member
Minuteman
Mar 25, 2008
129
0
55
Concord, N.C.
#1
New barrel and need some help. Have a Shilen 1-10 twist .308 barrel and groups pretty bad at 100 yards. Groups 1/4" at 50 yards. Heres what I started with:

Sighted in using 168 GR Federal Gold Medal Match
Results 1/4" Group at 100 yards 3 shots

Then used my reloads, and it was down hill from there. Here what I made so far:
IMR 4895 45 Grains Bullet: 168 GR. Nosler Ballistic Tip
Accurate 2495 44 Grains Bullet: 168 GR Nosler Ballistic Tip

Both made a ragged group of at least 2" wide, nothing was the same.
HELP....
 
#5
Re: Reloading 1-10 twist .308 need some help

Until you have a "base-line" contol group with something that shoots a well as Fed. match you MAY just be "chasing your tail"
Using the FGMM will tell you if it's you/your loads/your rifle.
Also have a KNOWN marksman shoot your "junk" and see how it shoots for him/her.....
Respectfully,
LG
 
#7
Re: Reloading 1-10 twist .308 need some help

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: wco24u</div><div class="ubbcode-body">New barrel and need some help. Have a Shilen 1-10 twist .308 barrel

Sighted in using 168 GR Federal Gold Medal Match
Results 1/4" Group at 100 yards 3 shots

</div></div>

Pretty well speaks for itself. You need to work on you loads. Plenty of info here for that.

My 1/10 likes 175's and 190's. does well with the the 165's and 168's but likes the heavy stuff better.

Might want to take it easy on the new barrel. Noslers accuracy load for Imr-4895 is 39 grains with a max load of 43 grains.
 
#8
Re: Reloading 1-10 twist .308 need some help

No chrono avalible, next trip to the range, just the range is over a hour away. I will be turning the heat down a little. Found a load in the depot,

42.6 Grains IMR 4895
FED 210 Primers

Which I have, I'll give the 172 GR. Federal Gold Medals a try also.

Rifle is pillar bedded, skim bedded, free floated, and torqued to specs. standing on the bi-pod barrel has plenty of room. Today shot off of a lead sled and bi-pod. The only reason for questions is I have a 700PSS rifle that will eat anything. Yes, I know we are speaking of to different twist rates.
 
#9
Re: Reloading 1-10 twist .308 need some help

A Sierra 168 MK and 41-42 grains of IMR-4895 was <span style="font-weight: bold"><span style="text-decoration: underline">THE</span></span> .308 match load for <span style="font-style: italic">decades</span>, although most people were shooting a 1:12" twist. I'd recommend trying between 41.5 and 42.0 grains of IMR-4895; I'll betcha it'll shoot with that.
 
#11
Re: Reloading 1-10 twist .308 need some help

What is your Seating Depth ? My 1:10 Shilen Shot like SHIT with loads I had on hand from previous barrel. Turned out They were jammed into the lands (Dumbass Mistake) I seated the bullets to .015 off an presto... it shot like it is suppose to.
 
#13
Re: Reloading 1-10 twist .308 need some help

That twist is the shits for the heaviers. Switch to 178 Amax's or 175 SMK's. Start a little lower on charge and work up say at .3 increments. 4895's a great powder, might try Varget or RL15 too. I'd do like they said earlier though and try some FGMM 175's to make sure all is well with the stick, I bet its a matter of tuning the load though. Good luck.

okie

PS. And lets not even get into all those neet, long, 155's
wink.gif
.
 
#14
Re: Reloading 1-10 twist .308 need some help

A 1/10 is the shits for the heaviers in a 308? These are 190 SMKs running at 2600fps at 175 yds. The top groups not so good because I adjusted the scope after the bottom 2 and when I shot the centers out I lost my point of aim. All are five shot groups. 2 on the left are 41.2 of AA2520 and the 2 on the right are 41.3. 41.5 was yielding 2610 on the last check and max load in most are 42. 175's shoot almost as good with RL-15 and Varget at 2710fps. 168's shoot decent at 2820 but have never matched that accuracy at 175. and the 190's shoot better at a distance than they do at 100. Shot out of a Savage 10FCP that's been skim bedded and a 1 lb trigger installed. Center diamond is 1/2" across the sides, larger diamond 1" side to side. Any of the loads should carry past 1000 yds without going subsonic.

308175yds-1.jpg
 
#16
Re: Reloading 1-10 twist .308 need some help

In this part of the country the shits are the last thing you want. Guess I'm to old for the jargon. When we say "Now ain't that the shits" it's because something went very wrong! However "slicker than shit" can be very good or very bad!
 
#18
Re: Reloading 1-10 twist .308 need some help

Well at 59 you would think you have about heard it all, but like they say "Shit Happens"!
blush.gif

Terry....Opps hear UPS at the door and about 1000 bullets, gotta run!
 
#19
Re: Reloading 1-10 twist .308 need some help

What would have been "proper" slang would have been "Heavy bullets are the shit for that twist rate."

Saying "shits" (plural) even at my age(21) would sound off and in a negative manner.

=)

Ur so close! My dad still can't get some phrases right...
 
#20
Re: Reloading 1-10 twist .308 need some help

I have a Hart 1-10 twist 308 barrel. I fired FGMM 168 and 175 with excellent results at 100 yards, I fired Blackhills 168 and 175 at 100 yards with excellent results. I shot old 173 grain Lake City M118 match and it was like a shotgun. My rifle like 175 SMK's and 43.5 grains of varget, using lapua brass and CCI br2 primers. I get the same results using Win Brass and Fed 210m primers, I load to coal and that its. I haved used both Varget and RE15 and varied the powder charge and got similar accuracy results but not the speed. I am going to start loading the heavier 185 bergers or lapuas and the 190 grain Sierra hoping the 1-10 twist will work better for longer ranges.
 
#21
Re: Reloading 1-10 twist .308 need some help

To quickly develop a good load pick a good bullet (168-175 smk) and seat them .010 off the jam. Then pick a good powder h4895, varget, n140, rl15... ect but pick one and stick with it. Then using 1 powder w/ the chosen bullet about .010 off bracket 5-8 rounds depending the powder. Bracketing is say with n140 and a 168 smk load 1 round at 40g, 1 round at 40.5g, 1 round at 41, 1 round at 41.5g, 1 round at 42 ect. Now at 100-150yards shoot each round at 1 target each using the same point of aim recording each load on its target. Then overlay and find the powder charge that grouped together. Say 40.5g through 41.5 all had the same point of impact load some at the mean cahrge of 41g and start varring your seating depth to dial in the load. If you change a component later do this agan for the new components.
 
#22
Re: Reloading 1-10 twist .308 need some help

Well, like I said, gonna be hard to get the 168's to run to thier capabilities in that barrel, they'll work, but not at thier best no matter where you seat them. IMHO, the 11.25 to 10 twist are custom made for the 175's and 178's and up. Run 'em like you want though.

okie
 
#23
Re: Reloading 1-10 twist .308 need some help

Agree with Okie completely on 175's or heavier . My brother tries to build loads with ladder test all the time and he's still looking for the right loads for his 243 he had 4 months before I got mine and I had loads shooting bug holes at the speeds they should be running in two setting. I start mid way loading 10 rounds of each load stepping up in either .5 or .3 gain increments. I shoot five shot groups with each charge one day and do the same another day. I then study all my targets and look at were the best accuracy node was and load .2 grain increments around them and repeat the test. I may or may not go back and do a .5 grain spread at .1 increments to get the best load but he still hasn't matched one of my loads and I now have five loads shooting bug holes and started on new bullets. Once I find my first load though I just work around that speed with any new powder combination and find the next ones quick. Over the years I've repeatably seen a particular rifle has a speed that the barrel is in tune with the whip and when you match that speed with something else it's close if not on the money as the same accuracy with other powders. Took some study time with a chrony to figure that out but it works for me. I've got at least 2 powders that work with every accurate load I have and all are within 20 fps of the same speed.
 
#24
Re: Reloading 1-10 twist .308 need some help

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: okiefired</div><div class="ubbcode-body">Well, like I said, gonna be hard to get the 168's to run to thier capabilities in that barrel, they'll work, but not at thier best no matter where you seat them. IMHO, the 11.25 to 10 twist are custom made for the 175's and 178's and up. Run 'em like you want though.

okie </div></div>

The 155 Scenar has more bearing area than the Sierra 175.

It's not weight, but length that makes the real difference.
 
#25
Re: Reloading 1-10 twist .308 need some help

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: okiefired</div><div class="ubbcode-body">Ahhhh...... did you not just prove my point? WTF? Yes, a 10 twist should do well with the heavier (or longer) 308 rounds, like I said.

okie </div></div>


Downzero, I agree, you're right and I said same. Read the whole thread. Once again, like I said. Concentrate on the "(or longer)" part of my quote. All these not so new now "Palma" type 155's have this long bearing surface.

okie
 
You must log in or register to reply here.

Similar threads

PRCslut
Bergara HMR pro .308 load help
Replies
7
Views
464
Cwither
C
L
308 load
Replies
16
Views
963
Luna4570
L
callen3615
Subsonic 308 1-12 Twist
Replies
12
Views
563
callen3615
callen3615
T
Needing some .308 subsonic hand load advice
Replies
20
Views
1K
redbullitt
redbullitt
C
Newbie trying to find a good load and need some help.
Replies
39
Views
562
Doom
Doom
Top Bottom
Back
Home
Forums
Merch
Alerts