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http://riflemansjournal.blogspot ... y-308-vs-30-06.html
by German Salazar
Mid-Range Comparison
In NRA Mid-Range matches (500 and 600 yards), the average score and percentage of possible score for each cartridge was as follows:
.308 - 597-36X (99.5%) 960 rounds fired
.30-06 - 595-31X (99.2%) 2580 rounds fired
Long-Range Comparison
I rarely shoot the .308 in matches that are only 1000 yards; most of my 1000 yard .308 shooting is done in Palma matches which include 800, 900 and 1000 yards. As most of you know, the .30-06 and 6XC can't be used in Palma matches. This creates a small difficulty in score comparisons because Palma matches have 15 shot stages and 1000 yard matches have 20 shot stages. To make the comparison useful, the Long-Range results are presented only as a percentage of the possible score and the 800 and 900 yard stages of Palma matches were not included in the comparison (although they are shown in the charts, they were not used in calculating the averages).
In NRA Long-Range and Palma matches, the average percentage of possible score for each cartridge at 1000 yards was as follows:
.30-06 - 97.7%, 460 rounds fired
.308 - 97.3%, 490 rounds fired
As you can see, the .308 went from the top of the list at Mid-Range to the bottom at Long-Range. This isn't too surprising when one considers its limited case capacity for the bullet weights typically used in Long-Range shooting. They just run out of steam and dip perilously close to the transonic range as they approach 1000 yards of flight (see this earlier article for more information on transonic problems). The extra 150 fps or so that can be safely obtained from the .30-06 case really pays off at 1000 yards.
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