Description of canister storage in HG don't match the core rulebook and don't match similar descriptions for missiles in HG and probably should.
(However, I prefer the current HG language for sandcasters rather than the core rulebooks. I understand the issues with 1 ton turrets packing in more missiles or sand canisters than physics would allow. However, from a game play perspective it is odd that triple sandcaster turrets would not hold an amount divisible by 3. I don't seek to litigate the discussions on turret storage, but just wanted to point out we are not yet aligned in the text across the rules)
HG 2022 Sandcaster: Although mounted in turrets and of use against boarders, the sandcaster is primarily a defensive weapon used to protect ships from laser, energy and particle weapons. Each Hardpoint-mounted sandcaster holds 20 sand canisters and costs Cr25000 to refill. Sandcasters on Firmpoints hold four canisters and cost Cr5000 to refill
Core Sandcaster: Although mounted in turrets and of use against boarders, the sandcaster is primarily a defensive weapon used to protect ships from laser weapons. Each turret with one or more sandcasters holds 20 sand canisters and costs Cr25000 to refill. It takes one round to reload a sandcaster.
The core rules sandcaster also don't include mention of use against energy and partical weapons despite the addition of the particle weapon barbette in the core rules, but that is feedback for the core book.