The point is that with a longer case and 19% more powder space, an extra .1" in bullet length isn't going to handicap a .30-06 the way you think it does a .308 Win.
The "handicap" from a longer bullet is about the same in either case since the bullets are the same diameter, and thus the loss of powder space is exactly the same.
No, the "handicap is NOT "about the same". Do the math.
A .308” bullet seated .1” deeper reduces powder space by .48837cc. Using various powder densities, that equates to the following grian weights:
1.68g H4831 1.67g Varget 1.89g BL(C)-2
Now let’s assume the following case capacities in grains of water: 56 = .308 Win 69 = .30-06
Reduce each case capacity by seating a .308” bullet .1” deeper and what do you have? ~54.3 = .308 ~67.3 = .30-06
So the 30-06 still has considerably more case capacity than the 308 Win started with while the .308 capacity is reduced by about 3%. The “obsolete” .30-06 is obviously much less sensitive to the seating depth.
I stand by my original statement that the 30-06 won’t be handicapped like the .308 will. Not nearly so much.
[Edited to correct math.]
Last edited by Coyote_Hunter; 06/19/17.
Coyote Hunter - NRA Patriot Life, NRA Whittington Center Life, GOA, DAD - and I VOTE!
No, I'm not a Ruger bigot - just an unabashed fan of their revolvers, M77's and #1's.
