Remington RSASS

[jtischauser]

Remington teams up with JP Enterprises to build a sweet .308!!! I think I found my future Heavy Metal 3 gun rifle.

Remington RSASS

 

[KillShot]

Jesse, you seriously need to consider checking out a POF*USA P-308. Maybe we can meet up sometime and you can handle mine to see how you like it.



With a 1:10 twist barrel, they [Remington] are definitely pushing the limits when it comes to accuracy with a .308 at anything beyond 800yds without the use of a good handload or Gold Medal SMK 175gr. From what I've seen and read, anything under a 175gr projectile tends to keyhole beyond 800yds.

I'm surprised they only included Leupold as the option for a scope seeing as how there's much better to be had, but hey, that's just me.

 

[jtischauser]

So do you need more twist to jeep it stable or less?

 

[KillShot]

More twist = more stability at long distances. My POF has a 1:10 barrel and I wish it had a 1:11.25 twist like the LWRC REPR.

 

[Spiff]

Palma shooters sling .308 cal 155s to 1000 all day long.

 

[Spiff]

More twist = more stability at long distances. My POF has a 1:10 barrel and I wish it had a 1:11.25 twist like the LWRC REPR.

Did you get your numbers backward?

 

[KillShot]

Palma shooters sling .308 cal 155s to 1000 all day long.

I did some research on the 155s after reading your comment and from what I've found, the 155s have a BC of .504 whereas the SMK 175 has a BC of .505.

Did you get your numbers backward?

The way I've understood it to be, the tighter the twist, the flatter the trajectory. Therefore, a barrel with a 1:11 twist is better than a barrel with 1:10 twist because the higher twist allows for the use of heavier projectiles.

Correct me if I'm wrong with anything I've said here. I am by no means an expert on the subject matter and still learning.

 

[Spiff]

The key word in that sentence is sling. You can sling a 155gr and/or 168gr bullet to 1000yds but your groups won't be as tight as using a SMK 175gr unless you have an awesome hand load but even then, the SMK 175gr is still the best tool for the job .

Sling is a random word I picked. If you're not rolling your own for long range, you're either wasting your time or have an awfully large budget for Federal FGMM.

The 155gr and 168gr are more susceptible to wind and are best suited for distances out to 800yds. For anything beyond 800yds, go with the SMK 175gr.

I used to spend a lot of time over at Sniper's Hide. Folks there were going to the Lapua 155gr Scenar because, while it has a lower BC than the 175gr offerings, the increased MV allows it to buck the wind more efficiently. Larger BC bullets do typically perform better, but the MV/BC balance just happens to work out the other way this time.

Nope, the numbers aren't backward. The tighter the twist, the better the trajectory and the less susceptible the projectile will be to wind variations.

More twist = more stability at long distances. My POF has a 1:10 barrel and I wish it had a 1:11.25 twist like the LWRC REPR.

Twist has nothing to do with trajectory, but it has everything to do with stabilizing longer projectiles. Since that's the case, and excluding other factors, why did you say you wanted a slower twist barrel than what you currently have?

 

[KillShot]

Spiff, check my edited post above. I guess I was editing while you were typing your reply.

As for twist...maybe I'm confused here?

My barrel has a twist rate of 1:10. Is that faster or is it slower than the REPR with a 1:11.25 twist rate?





*****************ADENDUM******************

I just found this but I haven't a clue of how accurate the information is:

[font="Arial][quote][b].308[/b]
- 8" for bullets heavier than 220gr.
- 10" for bullets up to 220gr.
- 12" for bullets up to 170gr.
- 13"* [url="http://www.shilen.com/calibersAndTwists.html"]Ratchet rifled 4 groove[/url]
- 14"* for bullets up to 168gr.
- 15"* for bullets up to 150gr.
- 17"* for bullets up to 125 gr.[/quote][/font]
[font="Arial]
[/font]
[font="Arial][b]Source[/b] - [/font][font="Arial] [/font][url="http://www.shilen.com/calibersAndTwists.html"]http://www.shilen.co...sAndTwists.html[/url]

 

[Spiff]

Twist rates are specified by one complete revolution in X number of inches. So a 1/10 barrel gives a bullet one turn in 10", and a 1/11.25 barrel gives a bullet one turn in 11.25". The 1/10 is a faster twist rate. The fastest twist rate that I've seen get a lot of use is the 1/6.5" Pac-Nor barrels used for shooting 90gr .223 SMKs at 1k yards. It is possible to spin a bullet so fast that the jacket comes off and the bullet blows up on the way to the target.

I'll try to find some data for a 175gr SMK vs a 155gr Scenar for you and run it through JBM ballistics.

 

[Wall]

Twist rates are specified by one complete revolution in X number of inches. So a 1/10 barrel gives a bullet one turn in 10", and a 1/11.25 barrel gives a bullet one turn in 11.25". The 1/10 is a faster twist rate. The fastest twist rate that I've seen get a lot of use is the 1/6.5" Pac-Nor barrels used for shooting 90gr .223 SMKs at 1k yards. It is possible to spin a bullet so fast that the jacket comes off and the bullet blows up on the way to the target.

I'll try to find some data for a 175gr SMK vs a 155gr Scenar for you and run it through JBM ballistics.

this is correct.....
The faster twist also increases pressure.

 

[Mitch Rapp]

Isn't the M24 a 1 in 11.25 twist? If I remember correct it was supposed to be the best twist for the 175 grain military match load. I have always been told the most accurate bullet was one that was stable, but just barely.

 

[KurtM]

Mr.T no need to go out of town for a .308 AR-10. I have a DPMS (makes the Remington) MK-12 LR-308. Brand New in the case, which will be for sale when I get back next week. look it up on DPMS's web site dpmsinc.com If you want it let me know. A quick list of stuff

18" Fluted Barrel, Quad-Rail forend w/ rail protectors, Back Up Iron Sights From M.I. 2 stage match Trigger, Mag-Pul Locking Collapsable stock....etc. Look under 7.62x51 N.A.T.O MK-12 in the catalog KurtM

 

[Spiff]

Ok, so I went over to Sniper's Hide and picked the most common velocity I could find for 155gr Scenars for people's loads, which was 2950 fps, then used the published velocity for 175gr FGMM on Federal's website, which was 2600 fps, and dropped them into JBM Ballistics Calculator.

Here's the 155s:

And here's the 175 SMK:

So the 155 has 9 MOA (!) less drop at 1k yards than the 175, and .9 MOA less windage at 1k. I don't know how much faster you can push a 175 SMK in .308 than 2600 fps, maybe a little. 2950 fps for a 155 Scenar is hauling butt, so the numbers could close up a little.

Mitch, the Remington site says the current M24s are 1/11.25". I've heard the same thing, that overstabilizing can reduce accuracy.

Whatever, anyway, let's talk about this new rifle...does it offer anything more than an LRP from JP? Looks like it'll be more expensive since it comes with all the goodies straight from Remington. Cool rig though! I could see this thing crushing all the other military SASS rifles, 'cause JPs just flat out run. I hope it gets a chance.

 

[rifleman1981]

The faster twist rate does increase pressure, but stabilizes heaver more streamlined projectiles that fly truer, have higher ballistic coefficients and will buck wind drift a lot better than the lighter projectiles. I have been running a fast twist barrel for years and the further you want to shoot, the more the high bc bullets will pay off.

 

[Chambers]

Does it have a LMOS? Looks awesome!! Maybe a little fat.