Scope · Discovery
Discovery HD 3-12×44 SFIR FFP-MIL 30mm Compact Scope
Compact 30mm-tube first-focal-plane scope with MIL turrets and a 44mm objective. The dual-purpose pick for the hunter who wants one scope across PCP and a rimfire backup.
Image credit: Airgun Archery Fun
Quick take
The HD 3-12×44 is the scope to buy when you've outgrown the bundled 3-9×40 and want one scope that works on both a PCP and a rimfire. 30mm tube gives you 24 MIL of elevation and windage adjustment (the 25mm tube version stops around 16 MIL), the 44mm objective gathers enough light for dawn/dusk shooting, and the FFP-MIL reticle scales with magnification so your holdovers stay honest at any zoom. 38 orders at the partner, 100% positive reviews — proven Discovery glass.
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Specifications
Key specs
| Model | HD 3-12X44 |
| Magnification | 3× to 12× variable |
| Objective lens | 44mm |
| Tube diameter | 30mm |
| Reticle position | First focal plane (FFP) |
| Reticle units | MIL |
| Illuminated reticle | Red, 6 brightness settings |
| Click value | 0.1 MIL per click |
| Elevation adjustment | 24 MIL |
| Windage adjustment | 24 MIL |
| Zero reset | Locking turrets, zero reset |
| Field of view | 6.6° at 3× / 1.6° at 12× |
| Eye relief | 3.6″ to 3.4″ (9.2–8.8cm) |
| Exit pupil | 4.6mm to 3.66mm |
| Parallax / side focus | 10 yards to infinity |
| Length | 240mm (9.45″) |
| Weight | 575g (20.28 oz) |
| Recoil rating | .50 BMG rated |
| Waterproof / fogproof | IP67 / Nitrogen purged |
| Battery | CR2032 |
| Ring options | 11mm med/hi · Picatinny med/hi · Discovery 6061 1.45″/1.26″ · Discovery 6063 11mm 1.36″ |
The Hunt & Live take
Why this scope earns the pick
The HD 3-12×44 is what we’d recommend to a buyer who already owns a PCP and is planning to buy a .22LR or .17 HMR rimfire within the next year. The .50 BMG recoil rating means it’ll survive anything you’d ever bolt it to — including the snap-back recoil of a high-power PCP that knocks budget scopes loose by the third magazine. 24 MIL of total elevation is enough to hold zero out to 200 yards on a rimfire and dial all the way down for 15-yard PCP work.
The FFP-MIL reticle is the right choice for hunters who want to learn one ranging system and apply it across calibers. Mil-dots scale with magnification on FFP, so the same holdover work at 4× and at 12× — once you know your gun’s drops in MIL, you’re done.
What it pairs with
For the Snowpeak Lynx Gen 3 Picatinny rail, select the Picatinny medium rings at checkout. For older 11mm dovetail-rail PCPs (Stormrider, PR900 originals), the 11mm 1.36″ Discovery 6063 rings are the right pick — they accommodate the 30mm tube and 44mm objective bell clearance. If you have a tall front sight or a thread protector that blocks the objective bell, jump to the Picatinny hi.
Ring choice at checkout
The partner ships the scope with your choice of mounting rings at no extra cost — this is a real cost saving since 30mm rings retail for $40-60 separately. The decision matrix:
- Picatinny rail, no tall front sight → Picatinny medium
- Picatinny rail, tall front sight or scope clearance issue → Picatinny hi
- 11mm dovetail PCP, modern objective → Discovery 6063 11mm 1.36″
- 11mm dovetail PCP, older slim profile → 11mm hi generic
Honest trade-offs
The 30mm tube means you can’t reuse 1-inch rings if you’re swapping from an older scope — budget another $30-50 if your rings won’t fit. The 9.45″ length is on the longer side for a compact scope, so check your rifle’s scope rail real estate before ordering. And the 575g weight isn’t featherweight — if you’re building a backpacking PCP, the LHT 3-12×42 (below) is 200g lighter at roughly the same magnification range.
But for a dual-PCP/rimfire scope at the mid-tier price, this is the most honest spec sheet on the partner’s site.
Pillar resource · Featured
The Perfect PCP Starter Kit for Beginners
Every part. Every line item. Picked, budgeted, and linked. Snowpeak Lynx Gen 3 rifle with bundled scope, hand pump, pellets, mounts, silicone oil, fill adapter, bipod, and case — $1,200–$1,500 CAD total, every item from our Canadian partner.
Read the full starter-kit guide →In partnership with
