7.62x51mm in a 308.

SecondChance · 11-12-2011, 02:31 PM

I saw today that Cabelas by me had Fed. Prem. 7.62x51mm in 175grn Sierra's MK's and they were marked "Gold Medal Match" underneath. I know they are not the same, 7.62x51mm and 308, but was just curious has anyone shot them for accuracy?
I know the 7.62x51mm was/is made for the auto's and not vice versa. Whatcha think? Can't seem to be able to find the GMM around here.

Ridge Runner · 11-12-2011, 02:49 PM

try them, they are safe in a 308.
RR

westtexducks · 11-12-2011, 04:33 PM

Wow you learn something everyday i always thought they were the same cartridge, just a different name kinda like the .223 and 5.56x45mm. This is one of the reasons I love coming to this site I am always learning stuff.

SecondChance · 11-12-2011, 04:46 PM

Quote:

Originally Posted by Ridge Runner

try them, they are safe in a 308.
RR

I have always known they were safe in a 308. I just knew that they were designed for the M24's and A1-01 and just the autos for they are just loaded tad different for the gas recoil systems.
I was just nosey if anyone tried them in a bolt gun for S&G's to see if they were as accurrate? Am I making sense? I think I am digging a stupid hole for myself.

Ridge Runner · 11-13-2011, 06:14 AM

they'll do fine, probably real close to the same load used in the field by the us snipers using a bolt gun. most probably loaded with ball powder, may be a bit temp sensative but accuracy should be fine.
RR

SecondChance · 11-13-2011, 08:14 PM

Quote:

Originally Posted by Ridge Runner

they'll do fine, probably real close to the same load used in the field by the us snipers using a bolt gun. most probably loaded with ball powder, may be a bit temp sensative but accuracy should be fine.
RR

Yeah, I have some of the Military M118 LongRange ammo from work and it shot real good. Was told it is a military spin off of the GMM. Just trying to see if it would be worth my while to try it. Seeing we have since went to the 338 Lapua, we don't get much 308 ammo anymore. We keep the 308's as back-up guns JIC, but I don't ever see us going back to them as our principal weapon again.

SecondChance · 11-13-2011, 08:23 PM

Quote:

Originally Posted by westtexducks

Wow you learn something everyday i always thought they were the same cartridge, just a different name kinda like the .223 and 5.56x45mm. This is one of the reasons I love coming to this site I am always learning stuff.

Same difference, .223 or 5.56 and 308 or 7.62x51mm. They are basically the same, but they are different enough in there own rights to be labeled as such. The 223 and 5.56mm are both using the same powder, bullet, and primer. The cases are just enough apart that you have to be able to really know to use a micrometer and the barrel chamberings are slightly different as well to tell them apart. More gov't BS!!! LOL!!!

Ridge Runner · 11-14-2011, 02:31 PM

the 223 and the 5.56 cartridges are effectively the same, the big difference is in the chamber, the 5.56 has a much longer leade, so in order to achieve max pressure they are loaded with more powder to make up for the extra room between the case neck and the lands, this can result in being over pressure if fired in a 223 with a short leade. so basicly a 5.56 chamber is a long throated 223.
RR