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8x57 IRS / 11.7 g (180 gr) Naturalis leadfree copper hunting cartridge
8x57 IRS / 11.7 g (180 gr) Naturalis leadfree copper hunting cartridge

8×57 IRS loaded with the 11.7 g (180 gr) Naturalis lead-free copper bullet – The wild boar stopper in driven hunts

The 8×57 IRS cartridge was born at the same time as its rimless brother 8×57 IS. The original idea was to develop a similar cartridge for the breech break combination guns like double rifles, drillings and vierlings. The other difference to the 8 x 57 IS round is the lower maximum pressure level which has been set for this caliber to 330 MPa. Throughout the years, Lapua’s 8×57 IRS ammunition has earned its success and reputation as a powerful wild boar stopper in driven hunts. The 8×57 IRS cartridge comes factory loaded with the 11.7 g / 180 gr Naturalis® bullet.

8×57 IRS / 11.7 g (180 gr) Naturalis

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Caliber

8×57 IRS
Bullet

Naturalis
Product no.

N318010
Bullet Code

N559
Bullet weight

11.7 g (180 gr)
Bullet type

Lead-free copper
Muzzle velocity

800 m/s (2625 fps)
Purpose

Hunting
Twist rate

1-9.5''
BC G1

0.248
BC G7

–
Velocity [m/s][fps]
Energy [J][ft.-lbs.]
Crosswind drift [mm]Crosswind drift [in] (sidewind 4 m/s)(sidewind 13 fps)
Trajectory [mm][inch]
Impact point above or below line of sight (Scope 40 mm above bore line)Impact point above or below line of sight (Scope 1.6 in above bore line)
Metric chart
0 m 100 m 200 m 300 m 600 m 800 m 1000 m 1200 m 1500 m
800 718 639 499
3744 3013 2388 1873
0 23 101 244
Rifle sighted in at 100 m 200 m 300 m 600 m 800 m 1000 m 1200 m 1500 m
100 0 -151 -544
159 GEE 40 -72 -425
Test barrel length [mm]: 600
Imperial chart
0 yd 100 yd 200 yd 300 yd 600 yd 800 yd 1000 yd 1200 yd 1500 yd
2625 2378 2140 1916
2762 2266 1835 1471
0 1 4 17
Rifle sighted in at 100 yd 200 yd 300 yd 600 yd 800 yd 1000 yd 1200 yd 1500 yd
100 0 -5 -17
Test barrel length [inch]: 24

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