8 x 57 IRS

Test barrel: 620 mm (24½”), 1 in 9½” twist
Primers: Large Rifle
Cases: Lapua, trim-to length 56,80 mm (2.236”)

Bullet	9,7 g / 150 gr		Speer, Spitzer		C.O.L. 75,0 mm / 2.953 inch
Powder	Starting load				Maximum load
Type	Weight		Velocity		Weight		Velocity
	[g]	[grs]	[m/s]	[fps]	[g]	[grs]	[m/s]	[fps]
N140	3,14	48.5	797	2615	3,35	51.7	858	2815
N540	3,12	48.1	793	2602	3,52	54.3	890	2920
N150	2,83	43.7	712	2336	3,08	47.5	890	2920
Bullet	11,7 g / 180 gr		Lapua, Naturalis N559		C.O.L. 79,5 mm / 3.130 inch
Powder	Starting load				Maximum load
Type	Weight		Velocity		Weight		Velocity
	[g]	[grs]	[m/s]	[fps]	[g]	[grs]	[m/s]	[fps]
N135	2,47	38.1	702	2303	2,65	40.9	742	2434
N140	2,63	40.6	711	2333	2,83	43.7	758	2487
N540	2,77	42.7	733	2405	2,94	45.4	778	2552
N150	2,63	40.6	717	2352	2,83	43.7	758	2487
Bullet	12,8 g / 198 gr		Brenneke, TIG		C.O.L. 77,0 mm / 3.031 inch
Powder	Starting load				Maximum load
Type	Weight		Velocity		Weight		Velocity
	[g]	[grs]	[m/s]	[fps]	[g]	[grs]	[m/s]	[fps]
N140	2,80	43.2	708	2323	2,95	45.5	739	2425
N540	2,93	45.2	721	2365	3,07	47.4	758	2487

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