In order to attempt a �real world� comparison, the following field type loads(magnum class rounds) that I ran through my ballistics program were taken from the 12th edition of the Speer manual (because Speer uses real instead of pressure guns). A 200 yard zero was used. Just as in the hypothetical model the differences are for the most part very miniscule.

What do You folks think ?

Good Shooting,
HBB

1.range 2. velocity 3. trajectory 4. actual drop 5. time of flight 6.muzzle energy
7. wind drift-10mph crosswind

1.220 Swift 52 grain bthp-match @ 3844 fps (.253 BC)(pg. 159) Test Rifle: Ruger 77-V w/26 in. bbl.
500 2151 -29.99 45.31 0.53 534 23.39

2.240 Wby Mag. 105 grain Spitzer @ 3206 fps ( .443 BC) (page 179) Test Rifle: Wby Mk V w/ 24in. bbl
500 2178 -34.4 56.41 0.57 1106 17.67

2.257 Wby Mag. 120 grain BTSP @ 3199 fps(.435 BC) (page 195) Test Rifle: Wby Mk V w/24 in bbl
500 2156 -34.84 56.97 0.58 1239 18.1

3.264 Win. Mag. 140 grain spitzer @ 3130 fps (.496 BC) (page 204) Test Rifle: 700Rem w/24 in barrel
500 2217 -34.72 57.47 0.57 1528 16

4.270Wby. Mag. 150 grain btsp @ 3249 fps ( .496 BC) ( page 211) Test Rifle: Wby Mk V w/ 26in bbl
500 2311 -31.94 53.23 0.55 1779 15.23

5.7MM Wby. Mag. 160 grain btsp @ 3082 fps (.556 BC) (page 235) Test Rifle: Wby. Mk V w/24 in barrel.
500 2268 -36.04 57.72 0.57 1828 14.35


6.300 Win. Mag. 180 grain btsp @3059 fps (.540 BC) (page 313) Test Rifle: Ruger 77 Mk II w/ 24 in bbl.
500 2227 -35.47 59.01 0.58 1982 14.98



7..338 Win Mag 225 grain btsp @ 2981 fps (.484 BC) (page 350) Test Rifle: 70 Win. w/24 in bbl
500 2077 -39.1 63.98 0.61 2155 17.58

HBB, there are lots of things that could be read into this data, but mostly you are right, there just is not a heck of a lot of difference from one cartridge to the next.

It is obvious that for all its speed, the 220 Swift is blown around by the wind pretty good compared to magnum hunting rounds.

It is clearly obvious that the 270 Weatherby Mag is a much over looked cartridge. It fairs quite well when compared to the others. It was, after all, one of the first ones Roy Weatherby came out with.

It is also obvious why I like my 7mm Weatherby Mag. Although I shoot 160 Nosler Partitions in mine.

It is also clear that the 225 Speer boat tail bullet in the .338 is a very streamlined projectile and hits hard down range. However, try as I might, I cannot get my .338 Win Mag to shoot it worth a damn! Believe me, I have tried. I bought a BUNCH of them cheap and have tried all sorts of loads. NO WAY! I guess I will just have to stick with those 225 Partitions.

Very interesting data.

R F