Remington LTR 308 1-12 Twist Advice on Subsonic Bullet

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1979brj
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Remington LTR 308 1-12 Twist Advice on Subsonic Bullet

Post by 1979brj »

Remington LTR 308 1-12 Twist 20 inch barrel Advice on Subsonic Bullet

(1) I loaded some 165 sierras hpbt (2140) with 9.4gr trail boss average vel. was 1020 fps (fun to shoot). At 10 yards every round (20 total) was nice little holes no keyholeing.. at 50 yards every round (5 total )keyholed.. Question: would you use these through "your" suppressor since they are stable a 10 yards. the keyholeing is ok, because they are sill accurate @ 50 yards just not perfect little holes. I have about 300 bullets and would like to use them up...
(2) Now looking for a better subsonic bullet to keep to form keyholeing. like a round nose flat base type, or what every you all recomend.
Have any of you got a 1-12 twist, and shoot subsonic? if so what type of bullet do you like and what grain? using a 1-12 twist.

I wish i had a 1-10 or faster but i dont.. so my new suppressor should be here in a month or two, just trying to work out some loads while waiting.

I have been researching and reading for weeks now, would really like to hear form First hand experence with subsonic 308 using 1-12 twist, and results - good or bad.

Thanks in advance for any help.. and thanks for reading.
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silentbushmaster
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Re: Remington LTR 308 1-12 Twist Advice on Subsonic Bullet

Post by silentbushmaster »

I have had great results with the Hornady 170 grain round nose flat base bullets.
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1979brj
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Re: Remington LTR 308 1-12 Twist Advice on Subsonic Bullet

Post by 1979brj »

thanks much for the reply.. Got some on order...
1979brj
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Re: Remington LTR 308 1-12 Twist Advice on Subsonic Bullet

Post by 1979brj »

i finaly got some phots to show. 8 yards, 25 yards and 100 yards..

Just cant figure out how to post pictures..
1979brj
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Re: Remington LTR 308 1-12 Twist Advice on Subsonic Bullet

Post by 1979brj »

ok.
same bullet 165 hpbt sierra (2140)

8 yards. 10 rouds. holes look ok to me i think.

https://docs.google.com/leaf?id=0B8Kt5_ ... ist&num=50

25 yards 3 rounds ( little unstable )

https://docs.google.com/leaf?id=0B8Kt5_ ... ist&num=50


100 yards ( not to good)

https://docs.google.com/leaf?id=0B8Kt5_ ... ist&num=50

https://docs.google.com/leaf?id=0B8Kt5_ ... ist&num=50


would you shoot them through your suppressor, since they look good at very close range.. i really like these bullets they group around 2 inches at 100. and since they are barely stable they should tumble when hit target.. just a thought.

using trail boss powder

I loaded some of the 170 grain and worked great. nice round holes at all ranges to 100 yards. i just have about 600 bullets of the sierras (2140). and they did group better then the 170 grains.

thanks agin.
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Golf_1911
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Re: Remington LTR 308 1-12 Twist Advice on Subsonic Bullet

Post by Golf_1911 »

Could you post some idea for other component like

Bullet
Brass
Powder & Charger
Primer
OAL
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dbrown
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Re: Remington LTR 308 1-12 Twist Advice on Subsonic Bullet

Post by dbrown »

I have a 1-12 twist in my 16" 308.

Bullet - Sierra 150 gr RN
Brass - mixed (i have a lot of FC and Rem as well as some others).
Powder & Charger - Trailboss and I believe it is 9.5 gr (not sure on that charge)
Primer - CCI Long Rifle
OAL - Loaded to cannelure

Take this with a grain of salt as your results may be different.
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Re: Remington LTR 308 1-12 Twist Advice on Subsonic Bullet

Post by Dragracer_Art »

I've been loading 180gr Hornady round nose flat base bullets over 10.5 grains of TrailBoss. 2.750" long.

Just ran a batch through my 700AAC-SD today and they were all between 1060-1100fps. At 50 yards they were all punching one ragged hole.

The batch I worked up with only 10.0grains of TrailBoss were poking holes 2-3" apart.

.5grain of that stuff made a HUGE difference in accuracy with my rifle.
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JohnInNH
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Re: Remington LTR 308 1-12 Twist Advice on Subsonic Bullet

Post by JohnInNH »

I have used both the 150 and 170 30-30 bullets in my 1:11.25 twist. Both are OK at 1000 FPS I woudl NOT go any heaver than 170 in a round nose flat base. Also make sure it;s over 950 FPS before you attach your silencer... the 150 is safer with a wider margin of error.

My 150's seemed quieter for some reason.. Both with Trial boss in the amounts above yielded a large extreme spread in FPS. Position sensitive as well. This lead me to purchase a Micro7 in 300 BLK. I just could not make a 308 work well at these speeds with this case capacity.

Maybe you will have better luck. I wold not go over the 170 gr in a 1:12 The terminal performance between a 170 and a 180 or 200 is minimal.. Heavier bullet lets you use more powder which should raise chamber pressures to get a better powder burn. But my chronograph findings did not show a measurable difference between the 150 and 170.

Can't wait for my Micro7 (I will still load 308 subs and keep a few with the 308 M700)
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1979brj
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Re: Remington LTR 308 1-12 Twist Advice on Subsonic Bullet

Post by 1979brj »

I settled with the 150 30-30 bullets with my 1-12. Just got my 300 blk out. Upper so i'll save the heavy stuff for it.. 300 blk-out is nice and those 220subs. Hit like a brick and supper quite suppressed.
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JohnInNH
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Re: Remington LTR 308 1-12 Twist Advice on Subsonic Bullet

Post by JohnInNH »

1979brj wrote:I settled with the 150 30-30 bullets with my 1-12. Just got my 300 blk out. Upper so i'll save the heavy stuff for it.. 300 blk-out is nice and those 220subs. Hit like a brick and supper quite suppressed.

Yes.. I have an upper and a bolt gun.. If you want real QUIET try using unique or 231, and load to 975-1000 fps. The faster powder will NOT cycle the action (like a bolt gun) then hand cycle. the difference between a A1680 powder load and a fast pistol powder load is flat out amazing.

I have shot thousands of subs now .. but am now working up loads for my AR .. I am shocked at just how loud they are! The slow powder for one.. then the ejection port blast. (compared to my bolt gun it's a blast LOL)

I sighted in my scope with bolt gun load subs and hand cycled... very quiet.. then shot a 208 A-Max :shock: a WTF moment.. birds took flight.. chickens ran, babies cried.. it was horrid!

Then shot my quiet American Select 5 gr loads with my 190's at just under 1000 and the birds landed.. the crickets started to chirp, the babies fell asleep.. all was well in the world again.

Yep it's that much different. LMAO.
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1979brj
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Re: Remington LTR 308 1-12 Twist Advice on Subsonic Bullet

Post by 1979brj »

Point taking and I know exactly what you mean by the sound difference. I am waiting on my sbr to get back and then will use a custom gas block to just shut the action off. It is amazing like you stated the difference in sound. So if I understand correctly I can use your load reconstruction powder and not have to mess with a gas block.. .
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JohnInNH
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Re: Remington LTR 308 1-12 Twist Advice on Subsonic Bullet

Post by JohnInNH »

my 152 gr M2 ball and 190 lead spire point bullets both with about 5 gr of American Select when shot in my PSA 16" upper will only move the bolt about 1/2" back .. not sure if it goes far enough back to open the action much.. Maybe enough to rotate the bolt and possibly move the bolt (not the carrier) back 1/4"

It will be almost the same as a gas block shut off in essence. (granted gas IS pressurizing the tube and some gas is forced into the gas key. So it is really not the same as shutting off a gas block, but sounds the same.
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sig.45
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Re: Remington LTR 308 1-12 Twist Advice on Subsonic Bullet

Post by sig.45 »

I just finished shooting some Sierra 150gr spitzers (2130) and they worked great

Bullet: Sierra 2130
Brass: FC trimmed to 2.005 oversized flash hole
Primer: CCI 250 Large rifle magnum
Charge: 9.1gr trail boss
Velocity: 1066fps

I have an 18" 1:12 twist Remington. Everything I tried that had a boatail would key hole. The 2130 is a flat base.
silverhawk500
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Re: Remington LTR 308 1-12 Twist Advice on Subsonic Bullet

Post by silverhawk500 »

I have been using the following :
Speer nitrex brass
speer 165 gr bt
primer fed LR
8 gr hogdon tite group
ave 1079 fps hi-1086/lo-1070
ES-16 SD-8
Ft/lbs - 426
57 degree/calm/barometer 30.00/elev-823 ft
DPMS SASS- 1/10 Liberty Freedom can
NOTE-this load does not cycle the bolt
all hits are straight @ 100 yd with subs and can
switching to fed gold medal zero changed to- 2" high, 2" left
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Bird
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Re: Remington LTR 308 1-12 Twist Advice on Subsonic Bullet

Post by Bird »

I would agree with above posts about not going over 170 or 180 grains with that slower twist. That being said, I'd suggest using a flat base bullet rather than a boat tail. There is more surface on a flat base bullet (even more on a round nose) than at boat tail or at the extreme, a VLD, that is engaging the lands and grooves. This has the effect of offering more stabilization at the lower velocities.

If you are going to hunt with your subs, use the heaviest bullet you can chunk accurately as the difference in energy down range is significant. For example, my subs at 100 yds: 180 grain have 363 ft/lbs energy while the 220's have 443 ft/lbs of energy. Since we are limited by velocity in subs, you have to make up the energy with bullet weight. Of course if you are just punching paper and/or plinking, 150 gr flat base FMJ's would probably work just fine.
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