Judges 20:16

Out of all this people, were seven hundred chosen men, left-handed, - any one of whom could sling with a stone to a hair's-breadth, and not miss.

Judges 3:15

And the sons of Israel made outcry unto Yahweh, and Yahweh raised up unto them a saviour, Ehud son of Gera, a Benjamite, a man left-handed, - and the sons of Israel sent, by his hand, a present, unto Eglon king of Moab.

1 Chronicles 12:2

armed with the bow, using right hand or left with stones, and with arrows in the bow, - of the brethren of Saul, out of Benjamin:

1 Samuel 17:40

Then took he his stick in his hand, and chose him five smooth stones out of the torrent-bed, and put them in the shepherd's-pouch which he had - even in the wallet, and had his sling in his hand, - and so drew near unto the Philistine.

1 Samuel 17:49-50

And David thrust his hand into his pouch, and took from thence a stone, and slang it, and smote the Philistine, in his forehead, - that the stone sank into his forehead, and he fell upon his face, to the earth.

1 Samuel 25:29

yea, though there hath arisen a sun of earth to pursue thee, and to seek thy life, yet shall the life of my lord be bound up in the bundle of the living, with Yahweh thy God, but, as for the life of thine enemies, he shall sling it out with the middle of the hollow of the sling.

2 Chronicles 26:14

And Uzziah prepared for them, for all the host, bucklers and spears and helmets, and coats of mail, and bows, - and yea even sling-stones.

Treasury of Scripture Knowledge

Summary

Among all this people there were seven hundred chosen men lefthanded; every one could sling stones at an hair breadth, and not miss.

Bible References

Left-handed

Judges 3:15
And the sons of Israel made outcry unto Yahweh, and Yahweh raised up unto them a saviour, Ehud son of Gera, a Benjamite, a man left-handed, - and the sons of Israel sent, by his hand, a present, unto Eglon king of Moab.
1 Chronicles 12:2
armed with the bow, using right hand or left with stones, and with arrows in the bow, - of the brethren of Saul, out of Benjamin:

Sling stones

1 Samuel 17:40
Then took he his stick in his hand, and chose him five smooth stones out of the torrent-bed, and put them in the shepherd's-pouch which he had - even in the wallet, and had his sling in his hand, - and so drew near unto the Philistine.
1 Samuel 25:29
yea, though there hath arisen a sun of earth to pursue thee, and to seek thy life, yet shall the life of my lord be bound up in the bundle of the living, with Yahweh thy God, but, as for the life of thine enemies, he shall sling it out with the middle of the hollow of the sling.
2 Chronicles 26:14
And Uzziah prepared for them, for all the host, bucklers and spears and helmets, and coats of mail, and bows, - and yea even sling-stones.