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I've had a question for a long time that maybe somebody here can clear up (I also posed the question in another forum). In the latest issue of the Rifle magazine, author Stan Trzoniec (whom I have a lot of respect for) was testing a Cooper rifle chambered in 30-06 and made this observation: "...What really grabbed my attention, however, was how close the various bullet weights (150, 165 and 180 grains) were when it came to trajectory. For all practical purposes, all but one could be counted on to hit within one inch or less of each other even out to 400 yards...".
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While I don't have an answer I do have an early 90s Remington 700 VSSF chambered in .308 Winchester which will consistently shoot sub MOA at 100 yards with Sierra 150 grain BTHP Match, 168 grain BTHP Match and 180 grain BTHP Match. The rifle did have work and has a Timney trigger. On average 5 shout groups will be within an inch of each other at 100 yards. Originally the scope was setup for the 168 grain BTHP Match bullets.
150 grain SMK
AA 2495 44 grains
2862 FPS
168 grain SMK
AA 2495 41 grains
2538 FPS
180 grain SMK
IMR 4064
2611 FPS
All brass was once fired LC 10 and all primers were CCI BR2 LR. The same ammunition loads did not fare as well in my AR 10 or my M1A. Why all three weights shot about the same point of impact I haven't a clue but in the two other rifles, while the groups were very good each load shot a different point of impact several inches away from each other at 100 yards.
Ron