The Indian WLR is better than present American AN/TPQ-36 WLR which is in service in low quantity, Americans refused to sell better AN/TPQ-37 WLR which was comparable to our Swasti now. Those AN/TPQ-37 WLR were sold to Pakistan instead and were used against us during Kargil war, And we had casualties ..
Today we made our own WLR call Swasti which is better or same to American counterpart AN/TPQ-37 WLR, Swasti is Indian in origin and cheaper so does can be produced in thousands and further can be modified as per need, Unlike imported designs ..
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35meters is good if not the best as a single 155mm shell has a effective blast radius of 30ms and if we count on shrapnel its more like 50ms, This is same for 120mm mortars and 80mm mortars as shrapnel distribution is same for latter both, If they are air-burst then the effect is much better, Its impossible to stay undamaged in that close proximity of such accurate fire, For example of a battery fire against a simulated enemy target >>.
Its not just the sheer explosion that cause damage but flying shrapnel are equally deadly and damaging for gunners and their guns ..
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But WLR used in counter battery, This consist of many guns against a single point of enemy,