flattest trajectory

[edknuthjr]

which caliber has the flattest trajectory at long ranges?

[charlie brown]

The 7mm RUM has the flattest trajectory of all big game rifles. If I remember right the Rem. fatory loaded 140 NP is only supposed to drop 25" at 500 yds. This is even flatter than the 22-250 with a 50 grain bullet!

[DANTHEHUNTER]

220 swift with a 40 gr v-max drops 27.5" at 500 yards . but i think 7mm rum is the flattest

[tabby]

The 7mm is that flat!?!?!? That is amazing. What is it' s velocity?

[charlie brown]

Here are the numbers from www.remington.com Pretty impresive!
220 Swift
22-250
7 RUM

Index No. Cartridge Type Wt. (grs) Bullet Style Primer No. Ballistic Coefficient
EL220SA EtronXâ„¢ 50 " V-Maxâ„¢, Boat Tail" 9 1/2 0.242
EL2250A EtronXâ„¢ 50 " V-Maxâ„¢, Boat Tail " 9 1/2 0.242
PR7UM2 Premier Ultra Mag 140 Nosler® Partition® 9 1/2 M 0.434

VELOCITY (ft/sec)
Cartridge Type Bullet Muzzle 100 200 300 400 500
EtronXâ„¢ 50 V-Max 3780 3321 2908 2532 2185 1866
EtronXâ„¢ 50 V-Max 3725 3272 2864 2491 2147 1832
Premier Ultra MagC 140 NP 3425 3184 2956 2740 2534 2336

ENERGY (ft-lbs)
Cartridge Type Bullet Muzzle 100 200 300 400 500
EtronXâ„¢ 50 V-Max 1586 1224 939 711 530 387
EtronXâ„¢ 50 V-Max 1540 1188 910 689 512 372
Premier Ultra Mag 140 NP 3646 3151 2715 2333 1995 1697

SHORT-RANGE¹ TRAJECTORY*
Cartridge Type Bullet 50 100 150 200 250 300
EtronXâ„¢ 50 V-Max 0 0.3 zero -1.2 -3.3 -6.7
EtronXâ„¢ 50 V-Max 0 0.3 zero -1.2 -3.5 -7
Premier Ultra Mag 140 NP 0 0.3 zero -1.3 -3.5 -6.8

LONG-RANGE² TRAJECTORY*
Cartridge Type Bullet 100 150 200 250 300 400 500
EtronXâ„¢ 50 V-Max 0.8 0.9 zero -1.9 -5 - 15.4 -33.2
EtronXâ„¢ 50 V-Max 1.7 2.1 1.6 zero -2.8 -12.8 -30.4
Premier Ultra Mag 140 NP 1.7 2.1 1.6 zero -2.6 -11.4 -25.7

[PaJack]

The 7mm STW is hard to beat also...

[eldeguello]

The 7mm RUM has the flattest trajectory of all big game rifles. If I remember right the Rem. fatory loaded 140 NP is only supposed to drop 25" at 500 yds. This is even flatter than the 22-250 with a 50 grain bullet!

The 7 RUM would have to give that 140 grainer over 3650 at the muzzle to shoot that flat.... The figures in the table given above are misleading for the 7 RUM, since it shows a zero of +2.1" @ 200 yards. This is NOT drop from the line of bore!

[akbound]

Uuummm......the M1A1 Abrams, 120mm Smoothbore does a really good job at long range.....(see: http://www.fas.org/man/dod-101/sys/land/m829a1.htm ).

But I don' t think you' ll shoulder fire it more than once!?!

The 7mm RUM may or may not be the flattest shooting " factory" standard cartridge.....but undoubtedly there are flatter shooting " wildcats" . I would venture a guess that all of the " light to mid bore magnums" shoot flatter than 95% of hunters can utilize " accurately" . And even many people that CAN shoot well at extended ranges, on a range, where distances are known and wind patterns can be learned, do not do so as consistently " in the field" .

I know this topic has generated " heated debate" in the past. I would just hope that for every shot taken at " long range" , and every worthy animal that suffers through " less than satisfactory results" , that we could post those instances, (with bylines), for all of our peers to see.

But to get back to the specific question. Most of the ammunition manufacturers post trajectory information concerning cartridges they load. Additionally many of the firearms manufacturers do likewise for their " brandname" cartridges. Outside of those two sources, (and probably the best place to look), would be the loading/reloading manuals. And there are ballistics programs available for PC' s that will calculate trajectories after component info is loaded.

Good luck on your search!

[338]

Lazzaroni has some pretty flat shooters that will outdo the RUM .. I also read about a .257 hot tamalli (sp) They said it will shoot 0-500 yds and still be in the kill zone on a deer size animal..I think it was a STW necked down to .257 ...Bill

[charlie brown]

338- I' ve heard about that cartridge, but have not seen any data on it. Probably is flatter than the RUM.