mickthebrick
Well-Known Member
Following on from the last .270 thread, the whole experience has got me thinking....and it hurts!
Can anyone tell me what the point is in using larger heavier bullets than a cartridge can efficiently "throw". I've compared the .308 to .270 with 150grn bullets and the "trebuchet" .308 comes out on top in every aspect!
Are heavier bullets used because they have a tougher construction and although they hit with less energy they hold together better?
I'm perplexed!
Cartridge Information
Index Number Cartridge Type Weight (grs.) Bullet Style Primer No. Ballistic Coefficient
R270W4 Remington® Express® 150 Soft Point Core-Lokt® 9 1/2 0.261
R308W1 Remington® Express® 150 Pointed Soft Point Core-Lokt® 9 1/2 0.314
Velocity (ft/sec)
Cartridge Type Bullet Muzzle 100 200 300 400 500
Remington® Express® 150 SP CL 2850 2504 2183 1886 1618 1385
Remington® Express® 150 PSP CL 2820 2533 2263 2009 1774 1560
Energy (ft-lbs)
Cartridge Type Bullet Muzzle 100 200 300 400 500
Remington® Express® 150 SP CL 2705 2087 1587 1185 872 639
Remington® Express® 150 PSP CL 2648 2137 1705 1344 1048 810
Short-Range Trajectory
Cartridge Type Bullet 50 100 150 200 250 300
Remington® Express® 150 SP CL 0.3 0.8 zero -2.4 -6.7 -13.0
Remington® Express® 150 PSP CL 0.0 zero -1.2 -3.9 -8.4 -14.7
Long-Range Trajectory
Cartridge Type Bullet 100 150 200 250 300 400 500
Remington® Express® 150 SP CL 2.0 1.8 zero -3.6 -9.4 -28.6 -61.2
Remington® Express® 150 PSP CL 2.0 1.7 zero -3.4 -8.8 -26.2 -54.8
Can anyone tell me what the point is in using larger heavier bullets than a cartridge can efficiently "throw". I've compared the .308 to .270 with 150grn bullets and the "trebuchet" .308 comes out on top in every aspect!
Are heavier bullets used because they have a tougher construction and although they hit with less energy they hold together better?
I'm perplexed!
Cartridge Information
Index Number Cartridge Type Weight (grs.) Bullet Style Primer No. Ballistic Coefficient
R270W4 Remington® Express® 150 Soft Point Core-Lokt® 9 1/2 0.261
R308W1 Remington® Express® 150 Pointed Soft Point Core-Lokt® 9 1/2 0.314
Velocity (ft/sec)
Cartridge Type Bullet Muzzle 100 200 300 400 500
Remington® Express® 150 SP CL 2850 2504 2183 1886 1618 1385
Remington® Express® 150 PSP CL 2820 2533 2263 2009 1774 1560
Energy (ft-lbs)
Cartridge Type Bullet Muzzle 100 200 300 400 500
Remington® Express® 150 SP CL 2705 2087 1587 1185 872 639
Remington® Express® 150 PSP CL 2648 2137 1705 1344 1048 810
Short-Range Trajectory
Cartridge Type Bullet 50 100 150 200 250 300
Remington® Express® 150 SP CL 0.3 0.8 zero -2.4 -6.7 -13.0
Remington® Express® 150 PSP CL 0.0 zero -1.2 -3.9 -8.4 -14.7
Long-Range Trajectory
Cartridge Type Bullet 100 150 200 250 300 400 500
Remington® Express® 150 SP CL 2.0 1.8 zero -3.6 -9.4 -28.6 -61.2
Remington® Express® 150 PSP CL 2.0 1.7 zero -3.4 -8.8 -26.2 -54.8