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Old March 7, 2013, 10:22 AM   #9
Bart B.
Senior Member
 
Join Date: February 15, 2009
Posts: 8,453
JD0x0, this thread needs a bit of "accuracy" history and facts. Based solely on accuracy, here's what happened starting 1963.

The first .308 Win. chambered in a match rifle was brought to the 1963 Nationals. It handily won. Within a year, several other top ranked high power match rifle shooters tried it out. Even the military match conditioning shops got to work rebuilding their M1 and M14 competition rifles to use it. 'Twas very easy to tell that with the same quality barrels, bolt action length (pre-' 64 Win. 70 contolled feed), bullets, case quality, powders, primers and all that stuff, the .308 shot 30 to 40 percent smaller test groups at 600 yards than the most accurate .30-06 chambered rifles in the country. Military shops rebuilding their M1's and M14's also saw better accuracy with the brand new 7.62 NATO M118 match ammo with the same bullet, powder and primers used in the M72 30 caliber match ammo after the first LC63 7.62 match ammo came off the production line. And Sierra Bullets' tests at the time showed the .308 case shot their 30 caliber bullets more accurate than the .30-06 ones did testing their ammo for accuracy.

From 1964 through 1965, high power match rifle scores went up; drastically. Most of the records held by folks shooting the .30-06 gave way to folks using the .308 Win. Most problematic was the number of unbreakable ties with perfect scores shot with the .308 cartridge on the old military A, B, and C targets with high scoring 5-rings near 3 to 4 MOA in size. By January, 1966, folks shooting the .30-06 were handicapped; the best accuracy from one tested in machine rests was about 5 to 6 inches at 600 yards. The .308's were easily getting 3 to 4 inches from that new, shorter, fatter case. It was no suprise that in early 1966, the NRA reduced the sizes (and changed values, too) of the 200, 300 and 600 yard targets used to about 2 MOA for their high scoring 10-ring. The military C target would still be used at 800 yards through 1000, but it finally gave way to a new target in the early 1970s with a 2 MOA 10 ring instead of the C target's 3.6 MOA 5 ring. In 1971, the NRA had took a poll of folks shooting 1000 yard matches and the vast majority agreed the old target should give way to the new one.

Since then, the .30-06 with a 1 or 1.5 degree leade angle has been shown to shoot about 90% as accurate as the .308 with its chamber's 1.5 degree leade angle. But with the same weight match rifle, folks using the .308 have less recoil during the bullet's barrel time so that cartridge is easier to shoot accurately; all other things being equal.
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US Navy Distinguished Marksman Badge 163
Former US Navy & Palma Rifle Team Member
NRA High Power Master & Long Range High Master
NRA Smallbore Prone Master

Last edited by Bart B.; March 7, 2013 at 10:30 AM.
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