Was 200 metres still gun range at Angamos?

At Angamos, did 200 metres still count as cannon range rather than boarding range?

Yes. It was point-blank naval gunnery range, where the Chilean heavy shells could penetrate Huáscar's armour with devastating effect.

Two hundred metres was an exceptionally close gunnery range for ironclads rather than merely a prelude to boarding. At that distance the heavy shells retained overwhelming kinetic energy and could penetrate the target's armour. Blanco Encalada's deliberate approach converted an already damaged opponent into a point-blank target. This explains why the late shots caused catastrophic effects inside Huáscar even though the ships had not yet come alongside.