Altaros ATP Queen — 60-grain .25-cal slugs (what you need to know)

If you run a .25-cal PCP (FX, Huben, Lothar Walther-barrelled rifles and the like) and you’ve been hunting for turned-slug performance without the usual runout and weight scatter, the Altaros ATP Queen 60-grain slug is worth a look. It’s one of the newer turned-lead designs aimed at delivering very consistent BC and long-range stability for airguns.

Quick specs

Calibre / diameter: .25 / 6.35–6.36 mm.
Weight: 60 grain (˜ 3.92 g).
Length: ~12.9 mm (0.51").
Ballistic Coefficient: BC ˜ 0.245 (G1) — a relatively high BC for a .25 slug, which helps retain velocity and resist wind.
Pack size: sold in 100-count packs.

What makes the Queen different?

Altaros machines these slugs on precision CNC turning equipment (their ATP process), producing extremely tight dimensional tolerances, excellent axial symmetry and very low weight variation between pellets. That manufacturing consistency is the main selling point — it reduces shot-to-shot dispersion and improves repeatable accuracy in high-end PCPs.

Recommended rifles & barrels

Altaros explicitly list the ATP QUEEN .25 as suitable for FX airguns with STX “superior heavy” liners and for other choked/un-choked Lothar Walther and CZ airgun barrels. Several retailers and resellers also recommend these slugs for FX Panthera-type magazines (the Queen’s length works with some Panthera magazine setups). As with all slugs, match the slug diameter/length to your barrel type for best results.

Velocity guidance & accuracy notes

User tests suggest a recommended muzzle velocity around 900 fps (˜ 275 m/s) or lower, with an absolute upper limit reported near ~980 fps for safety/accuracy reasons — but this depends strongly on your barrel and rifle setup. In community testing the 60-grain Queens have shown very promising groups (one tester reported ~1 MOA at 150 yds from a bench under favourable conditions), which speaks to the design’s potential in the right platform. As always: start conservative, tune your chronograph and accuracy at several velocity nodes, and pick the one that groups best in your rifle.

Practical use & performance

Best for: precision pest control, target shooting and longer-range airgun work where retained energy and wind performance matter. The Queen’s high BC helps at distance versus lower-BC slugs.
Not ideal for: very high-speed, hyper-lightweight builds aiming for maximum supersonic speeds — these slugs are built for stability and retained energy rather than extreme muzzle velocity.

Packaging & handling

Altaros packs these slugs in 100-count boxes; individually packed in foam-slot to avoid deformation in transit. The slugs are near-pure lead (manufacturer notes indicate very high lead content), so handle and store like any lead projectiles and follow local regulations/CE/UK safety guidance for lead.

Pros & cons — quick checklist

Pros

Very consistent machining and weight tolerances ? repeatable accuracy.
High BC for a .25 slug (˜0.245) ? better downrange performance.
Designed to work with FX/STX-lined barrels and similar premium airgun barrels.

Cons

Needs the right barrel/rifle to realise potential — not a universal “fits all” solution.
Heavier and longer than some .25 slugs — check magazine/interference if your rifle uses an indexer.

Bottom line

The Altaros ATP Queen 60-grain .25 slugs are a modern, precision turned-lead option aimed at serious PCP shooters who want consistent, long-range behaviour from a .25 slug. If you run an FX/Huben/Lothar Walther style barrel and want to squeeze extra repeatability and retained energy at distance, these are worth testing alongside your usual load. Always verify fit and chronograph results for your particular rifle before committing to bulk purchase.