175 MK's...1-10" or 1-12"?

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175 MK\'s...1-10" or 1-12"?

This is for a 308 bolt gun with a Lothar Walther barrel that will be shot in Tactical Matches up to 1000yds. I want it to shoot the 175's, don't care about the 168's. Which would I be better off with? What muzzle velocity would I need to stay transonic at 1K?

Thanks, Keith
 

MontanaMarine

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Re: 175 MK\'s...1-10" or 1-12"?

Marine sniping rifles in .308 are twisted 1-12. Marines shot them out to 1000 yards with the 175grSMK.

S1, could you elaborate on the weather conditions where 1-12 will not work, and exactly what effect these weather conditions have on the bullet/accuracy. I do not ask out of disbelief, but it surprises me that the military would use 1-12 if 1-10 would have advantages in variable weather conditions.

Thanks, MM
 

MontanaMarine

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Canyon Ferry, MT
Re: 175 MK\'s...1-10" or 1-12"?

Thanks for the feedback S1.

I always prefered a 1-10 in my .308 bore rifles for versatility in bullet weights on the heavy end. I shoot 190 gr SMKs in my 1-10 twist 30-06. Work well. I've tried them in my 1-12 .308, to 200 yards. OK at that distance, but haven't shot them at long range.

MM
 

Meat Eater

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Oct 20, 2002
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WV.
Re: 175 MK\'s...1-10" or 1-12"?

M-40 A3'S are 1-12" Schneider barrel's. 1.200" x 3" st. taper to .890 at 27" they cut at 24" from front of recoil lug or almost 25" tradional measurement at .920 dia.

[ 12-27-2002: Message edited by: Meat Eater ]
 

BountyHunter

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Re: 175 MK\'s...1-10" or 1-12"?

Montana Marine,

Are you sure on the Marine sniper M40a3's being a 1-12? I work at Quantico and thought the gunner in charge at Wpns trng Bn who builds all the M40s for the USMC told me that they are 1-11. I know for a fact the Army M24s are 1-11. I would be very surprised if they were still 1-12s.

BH
 

308

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Dec 13, 2001
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Fl
Re: 175 MK\'s...1-10" or 1-12"?

I have a used br barrel on my deer rifle cut at 21". It has a 14 twist, I use 150 nosler ballistic tips with great accuracy, the 165's shot well also, very well actually. I live and hunt in Fl, am I ever likely to see conditions where my slow 14 twist will not stabilze my bullets of choice? 308
 
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