Kachok
Member
This is a topic I see discussed at length on the forum, and seeing as I shoot and handload both I felt the need to address this topic. Many would suggest that the 7mm-08 is the vastly superior cartrage for shooting any real range but let's look at some real numbers.
Say you want a reasonably fast flat shooting load for deer hunting that will retain a healthy amount of energy out to 500yd. Lets use max load data from Nosler #6 as a reference point.
168gr Ballistic Tip 308 Win 52.5gr Big Game 2910fps (24" barrel) w/.490BC
The trajectory w/200yd zero is -7.07" at 300 -20.44" at 400 and -41.07" at 500yd.
Energy is 3159 ft/lbs at the muzzle and 2074, 1791, and 1539 ft/lbs respectively at range.
140gr Nosler Ballistic Tip 7mm-08 47.5gr Big Game 2953fps (26" barrel) w/.485 BC.
Trajectory is -6.86" at 300, -19.84" at 400 and -39.91" at 500
Energy is 2711ft/lbs at the muzzle, and 1776, 1532, and 1315 ft/lbs respectively at range.
In an 8lbs rifle recoil for the 308 checks in at 19.3 lbs and the 7mm-08 with a 14.4lbs.
At no point of this comparison does the 7mm-08 hold any large advantage over the 308 in trajectory, the difference in fact is hardly noticeable. The only real noticeable difference is in the energy/impact of the heavier 30 caliber bullet and the lower recoil of the 7mm-08. Take that with a grain of salt though because in the case of my rifles (a Model 70 Featherweight and a Browning A-Bolt) my 308 has less felt recoil because of a few ounces more weight and it has a better recoil pad. I like this comparison because Big Game powder is the fastest for both calibers and the only variable is the 2" more tube on the 7mm-08 which makes up the 43fps difference between them. The sectional density of the 168gr 308 and 140gr 7mm-08 is very nearly the same.
I could compare lighter or heavier bullets if you wish, the matchup between 180gr 308 and 160gr 7mm-08 is a close one too, though in that case the 7mm-08 holds a tiny bit more of an edge in trajectory, still a very close race though.
Say you want a reasonably fast flat shooting load for deer hunting that will retain a healthy amount of energy out to 500yd. Lets use max load data from Nosler #6 as a reference point.
168gr Ballistic Tip 308 Win 52.5gr Big Game 2910fps (24" barrel) w/.490BC
The trajectory w/200yd zero is -7.07" at 300 -20.44" at 400 and -41.07" at 500yd.
Energy is 3159 ft/lbs at the muzzle and 2074, 1791, and 1539 ft/lbs respectively at range.
140gr Nosler Ballistic Tip 7mm-08 47.5gr Big Game 2953fps (26" barrel) w/.485 BC.
Trajectory is -6.86" at 300, -19.84" at 400 and -39.91" at 500
Energy is 2711ft/lbs at the muzzle, and 1776, 1532, and 1315 ft/lbs respectively at range.
In an 8lbs rifle recoil for the 308 checks in at 19.3 lbs and the 7mm-08 with a 14.4lbs.
At no point of this comparison does the 7mm-08 hold any large advantage over the 308 in trajectory, the difference in fact is hardly noticeable. The only real noticeable difference is in the energy/impact of the heavier 30 caliber bullet and the lower recoil of the 7mm-08. Take that with a grain of salt though because in the case of my rifles (a Model 70 Featherweight and a Browning A-Bolt) my 308 has less felt recoil because of a few ounces more weight and it has a better recoil pad. I like this comparison because Big Game powder is the fastest for both calibers and the only variable is the 2" more tube on the 7mm-08 which makes up the 43fps difference between them. The sectional density of the 168gr 308 and 140gr 7mm-08 is very nearly the same.
I could compare lighter or heavier bullets if you wish, the matchup between 180gr 308 and 160gr 7mm-08 is a close one too, though in that case the 7mm-08 holds a tiny bit more of an edge in trajectory, still a very close race though.