Barrett MRAD .308 twist rate

[fc2462]

Greetings,

Noob here just getting into PRS. I have a Barrett MRAD in 6.5CM and I was interested in getting a .308 WIN barrel for it because they currently have a sale going on where a 22" .308 WIN is 25% off!

However, the standard .308 WIN barrel is 24" with a 1:8 twist. I was wondering what if anything I will lose if I go with this 22" 1:10 twist? I mainly want the .308 for hunting and would be using the 178gr Hornady ELD-X hunting load. I will be using a suppressor on it as well.

I would really appreciate any advice and/or experiences anyone has with this.

Thanks,
FC

 

[GIXXER2000]

You will lose a little with a 22 vs 24. AS info I went from a 24 to 26 and gained about 90 FPS but I changed from a Bartlein to Schneider barrel . This Schneider P5 rifled barrel is a fast barrel. My original Bartlein 24in AI-AE barrel 1-10 twist was 2628 AVG FPS with SD of 5.3. My current Schneider 26 in 1-10 twist barrel is at 2721 AVG FPS with SD of 4.9. These numbers are all with 178 ELD-M

 

[fc2462]

Should I worry about the twist rate though? After doing a bit of googling, it seems that 1:10 is quite common for 308 and seems like a good do-all for a variety of bullet weights. Would I get any increased accuracy from the 1:8 in 308 with the 168-178gr range?

 

[GIXXER2000]

No don't over think twist rate. If I remember correctly I think the military M40 sniper rifles were a 1-11, 1-12 or something like that. The faster twist rate like 1-8 is for heavier bullets in the 190 200+ range maybe in something sub-sonic. A 1-10 twist will be all you need. I had a Steyr SSG-04 308 with a 23.5 1-12 barrel and it shot 175 SMK's lights out. The only grain weight bullets I shoot in my 308 26in 1-10 are 175's and 178's. and both shoot awesome. Never played with lighter stuff.
Kind of the rule of thumb is the heavier the bullet the faster the twist.

 

[diggler1833]

1:10 is dandy for the 178gr stuff. I run 1:10 on my pig gun and it works all the way down to 130gr bullets just fine. I've only ran up to 180gr, but that is in the wheelhouse of the 1:10...you should be good to around 200gr depending on bullet length/design, and the speed and atmospheric conditions where you're shooting.

For many years, the Marines ran 1:12 with 175gr SMKs without issue in the M40s.

 

[SmimL7]

Does anyone know if you can purchase the 20” 1/8 twist barrels that come with the MK22 kits?

 

[SpeedDrop]

Does anyone know if you can purchase the 20” 1/8 twist barrels that come with the MK22 kits?

Not available commercially.

 

[redneckbmxer24]

Not available commercially.

Technically you can. They’re about $15K and come with some other barrels, a rifle, a bunch of mags, and some other cool random bits for free.