The bracket was 50-52 graduations, for which respectively a short round (–) and a round over the target (+) had been obtained.
Height of the sight for the group	I	II	III	IV	V	Remarks
1st case : the short limit 50 was final, it was repeated, obtaining 50 (+), then a verifying group of 4 round was shot.
50	+	+	–	+	–	case 1 : the limit was accepted as probable range and maintained. cases 2 and 5 : the bracket was abandoned : 1 round at the same elevation was fired, changing the limit of 2 graduations in the other side (48); if an opposite observation (–) or a new bracket of 2 graduations was not obtained, the high and the low brackets were made sequence, taking into account the observations obtained before. cases 3 and 4 : the long limit (52) was repeated.
50	+	+	–	–	+
50	–	+	–	–	+
50	–			–	+
	1	2	3	4	5
2nd case : the long limit 52 was final, it was repeated, obtaining 52 (–), then a verifying group of 4 round was shot.
52	+	+	–	+	–	case 6 : the limit was accepted as probable range and maintained. case 7 and 10 : the short limit (50) was repeated. cases 8 and 9 : the bracket was abandoned : 1 round at the same elevation was fired, changing the limit of 2 graduations in the other side (54); if another short round (–) was obtained, the bracket was regarded as false, and the high and the low brackets were made sequence, taking into account the observations obtained before.
52	+	+	–	–	+
52	–	+	–	–	+
52	–			–	+
	6	7	8	9	10
3rd case : the long limit 52 (+) repeated, the short limit 50 (+) was repeated, then a verifying group of 4 round was shot there.
50	+	+	–	+	–	case 11 : the limit was accepted as probable range and maintained. cases 12 and 15 : the bracket was abandoned as in 2: 1 round at the same elevation was fired, changing the limit of 2 graduations in the other side (48); if another short round (–) was obtained, the bracket was regarded as false, and the high and the low brackets were made sequence, taking into account the observations obtained before. cases 13 and 14 : the fire was moved to the middle of the bracket (51) and a new group of 4 rounds was shot.
50	+	+	–	–	+
50	–	+	–	–	+
50	–			–	+
	11	12	13	14	15
4th case : the short limit 50 (–) repeated, the long limit 50 (–) was repeated, then a verifying group of 4 round was shot there.
52	+	+	–	+	–	case 16 : the limit was accepted as probable range and maintained. cases 17 and 20 : the fire was moved to the middle of the bracket (51) and a new group of 4 rounds was shot. cases 18 and 19 : the bracket was abandoned as in case 8 : 1 round at the same elevation was fired, changing the limit of 2 graduations in the other side (54); if another short round (–) was obtained, the bracket was regarded as false, and the high and the low brackets were made sequence, taking into account the observations obtained before.
52	+	+	–	–	+
52	–	+	–	–	+
52	–			–	+
	16	17	18	19	20
5th case : the short 50 (–) and long limit 52 (+) repeated, a verifying group of 4 round was shot in the middle of the bracket.
51	+	+	–	+	–	case 21 : the limit was accepted as probable range and maintained. cases 22 and 25 : the fire was moved to the short limit of the bracket (50). cases 23 and 24 : fire was moved to the long limit of the bracket (52).
51	+	+	–	–	+
51	–	+	–	–	+
51	–			–	+
	21	22	23	24	25
Staying at one of the limits (cases 2-5, 7-10, 12, 15, 18-19, 22-24) or firing at the middle of the bracket (cases 13, 14, 17, 20), the observations were raised to 6-8 and the limit was accepted if the short rounds were 2-4 or 3-5. With more rounds, the short rounds should be from ½ to ¾, otherwise the shell fire was carried on changing the elevation of 1 graduation.