Slavia 631 accuracy at 10m

10 meter distance shooting accuracy for Slavia 631 SPRING air rifle, uploaded by Igor, at September 20, 2017. Test ID: #6 (SPRING = Spring powered)

Average accuracy for tested 631 airgun is 0.8 cm (≈ 0.3 inch) horizontal and 1.1 cm (≈ 0.4 inch) vertical accuracy. Diagonal = 1.3 cm (≈ 0.5 inch) (from center-to-center of the hits). Tested distance was 10m. The details of test can be seen below shooter's description.

Scope: Hawke 3-9x40 AO, 30 years old gun, only old parts were replaced, but no special tunning. Outdoor shooting, no wind.

Tested air rifle:

Type:	631
Brand:	Slavia
Power:	SPRING
Aiming:	scope
Caliber	.177
Speed:	558 fps = 170 m/s
Energy:	7.5 J = 5.5 ft-lbf
Modified*	n

Ammunition:
JSB Diabolo Exact Express, 0.51 g.

Result of shooting accuracy:

	horizontal		vertical
	cm	inch	cm	inch
1.	1.6	0.6	0.6	0.2
2.	0.7	0.3	1.5	0.6
3.	0.3	0.1	1.4	0.6
4.	0.7	0.3	0.7	0.3
avg	0.83	0.3	1.05	0.4

Shooting distance: 10m
Diagonal accuracy: 1.34 cm

More statistics

Theoretically, what is the smallest target that can be hit N times out of 10 shoots. N=
1×: 0.2×0.3 cm (=0.1×0.1 in)
5×: 0.5×0.6 cm (=0.2×0.3 in)
9×: 1.4×1.7 cm (=0.5×0.7 in)
Coke can hits: 20 /20
Matchbox hits: 20 /20
Sugar cube hits: 14/20

Standard deviation (best if 0):

Horizontal: 0.48 cm = 0.19 inch
Vertical: 0.4 cm = 0.16 inch
Diagonal: 0.62 cm = 0.25 inch
Hor./Vert. ratio: 1:1.27 = 79% info
Predicted shooting accuracy at 10m×2 = 20m distance: 1.8×2.3 cm = 0.7×0.9 in.

Igor rated this air gun with .