Slavia 631 accuracy at 25m

25 meter distance shooting accuracy for Slavia 631 SPRING air rifle, uploaded by Igor, at September 20, 2017. Test ID: #7 (SPRING = Spring powered)

Average accuracy for tested 631 airgun is 1.9 cm (≈ 0.7 inch) horizontal and 2.1 cm (≈ 0.8 inch) vertical accuracy. Diagonal = 2.8 cm (≈ 1.1 inch) (from center-to-center of the hits). Tested distance was 25m. The details of test can be seen below shooter's description.

Scope: Hawke 3-9x40 AO, 30 years old air rifle, only old parts were replaced, but no special tunning. No wind (outdoor shooting test).

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.	2.6	1	2.9	1.1
2.	2.2	0.9	1.8	0.7
3.	1.9	0.7	2	0.8
4.	0.9	0.4	1.7	0.7
avg	1.9	0.7	2.1	0.8

Shooting distance: 25m
Diagonal accuracy: 2.83 cm

More statistics

Theoretically, what is the smallest target that can be hit N times out of 10 shoots. N=
1×: 0.6×0.7 cm (=0.2×0.3 in)
5×: 1×1.1 cm (=0.4×0.4 in)
9×: 2.6×2.9 cm (=1×1.1 in)
Coke can hits: 20 /20
Matchbox hits: 20 /20
Sugar cube hits: 7/20

Standard deviation (best if 0):

Horizontal: 0.63 cm = 0.25 inch
Vertical: 0.47 cm = 0.19 inch
Diagonal: 0.79 cm = 0.31 inch
Hor./Vert. ratio: 1:1.11 = 90.5% info
Predicted shooting accuracy at 25m×2 = 50m distance: 4.1×4.5 cm = 1.6×1.8 in.

Igor rated this air gun with .