Choose a rifle scope by starting with the distances you really shoot, then pick the lowest magnification range that covers them, an objective size that suits your light, and a reticle and turrets that match how you aim. For most UK stalking and club shooting that means something in the 3-9x to 3-12x class; for practical rifle it means a 1-6x or 1-8x LPVO.
The most common mistake is not buying poor glass. It is buying twice the magnification you need and paying for it three times: at the till, in weight on the rifle, and in a dimmer, fussier image at the top of the zoom. A scope is a set of trade-offs in a tube. Match them to what you shoot and a modest scope will outshoot an expensive one chosen from the spec sheet.
Key takeaways
- A rough rule: 1x of magnification per 100 yards (91 m) is enough to shoot well, and 2x per 100 is comfortable.
- Exit pupil is objective diameter divided by magnification: a 56 mm objective at 8x gives 7 mm, the most a young dark-adapted eye can use.
- A wider tube (30 or 34 mm) gives more adjustment range, not a brighter image.
- Rimfire shooters need parallax adjustment or a scope set for 50 yards, not a centrefire scope fixed at 100.
- Budget for good rings or a mount; we do not stock them, so buy them from a specialist.
Start with distance, not magnification
Work out the realistic distances you shoot at, and be honest. A rule of thumb that has served target shooters for decades: about 1x of magnification per 100 yards is enough to shoot well, and 2x per 100 gives comfortable precision. A deer at 150 m is perfectly shootable at 6x. A 25 m rimfire card needs almost nothing. The 300 to 600 m targets that justify 15x and beyond are not available on most UK ranges, and where they are, you will know.
High magnification carries hidden costs. The field of view shrinks, so finding an animal in woodland at 12x becomes a real problem. Every wobble is magnified, which tempts shooters into snatching shots. Heat haze (mirage) boils the image on warm days. And the exit pupil shrinks until the image goes dim and your eye position becomes critical. That is why most UK shooting happens between 3x and 10x.
| Typical use | Realistic distances | Sensible magnification |
|---|---|---|
| Rimfire plinking and club targets | 25–100 m | Fixed 4x, or 2-7x to 3-9x |
| Woodland deer stalking | 40–150 m | 2-10x or 3-12x class |
| Hill stalking and foxing | 100–300 m | 3-15x class |
| Civilian Service Rifle and practical rifle | 10–500 m, fast transitions | 1-6x or 1-8x LPVO |
| Precision paper and steel | 300 m and beyond | 5-25x class |
Objective size: light gathering against everything else
A bigger objective lens lets in more light, but only up to what your pupil can use. Exit pupil is the number that matters: objective diameter divided by magnification. A 56 mm objective at 8x gives a 7 mm exit pupil, about the maximum a fully dark-adapted young eye can take in, which is why the 8x56 became the traditional European dusk scope. The same 56 mm objective at 15x gives 3.7 mm, little better in dim light than a 42 mm objective at 11x (3.8 mm).
The big objective also costs you. It weighs more, costs more to make well, and forces higher mounts, which lifts the scope away from your cheek. For a rifle carried all day, a 40 to 50 mm objective in low mounts usually makes the better rifle. Dedicated stalking scopes cluster in the 40 to 56 mm range for this balance of dusk performance and weight. Our deer stalking scope guide goes into this in more detail.
Tube diameter: what 30 mm actually buys
Scope tubes come mainly in 1 inch (25.4 mm), 30 mm and 34 mm. A wider tube does not gather more light, because the lenses inside decide that, not the tube. What it gives is more room for the internal lenses to move, so more adjustment range for dialling at long distance, plus a little extra stiffness.
A 30 mm tube is the general-purpose standard and is used on most LPVOs, such as the SIG Sauer TANGO-MSR 1-6x24. Full-size 1-10x LPVOs and long-range scopes often use 34 mm. One-inch tubes still make light, entirely adequate stalking and rimfire scopes, such as the Burris Fullfield E1 3-9x40. Match the rings to the tube, and do not pay for adjustment you will never use.
Turrets: capped, dialling or locking
Be honest about whether you will ever dial a correction in the field.
- Capped turrets are for shooters who zero once and hold over after that. Nothing to knock, nothing to lose. This describes most stalking use.
- Exposed target turrets suit precision shooters who dial elevation for known distances. Insist on a zero stop, so you can wind back to zero by feel; without one, a miscounted turn puts you a full rotation out.
- Locking turrets split the difference: pull to unlock, dial, push to lock. The Burris Signature HD 3-15x44 has push-pull locking turrets, according to Burris.
Whatever the style, tracking, meaning whether 10 clicked MRAD really moves the impact 10 MRAD, separates good scopes from cheap ones more reliably than image sharpness. It is also the hardest thing to judge in a shop. A simple box test on the range, covered in our zeroing guide, checks it.
Reticle and focal plane
For shots inside 200 m, a plain duplex is quick and uncluttered. If you hold over, a BDC or ACSS reticle does the sums for you. If you measure and correct, you want a mil or MOA grid, ideally in the first focal plane. Our guide to reticle types covers the choice in depth, including focal plane and MOA or MRAD units.
Glass and coatings: where the money goes
Price tiers in scopes are real, but the returns shrink. The step from a bargain scope to a respected mid-range brand buys reliable tracking, proper nitrogen purging, honest waterproofing and glass without distracting distortion: the biggest jump in usefulness per pound. The step from mid-range to premium glass buys resolution and contrast in the last minutes of legal light, better control of colour fringing, and mechanical refinement. If you shoot at dusk a lot, that last step is worth it. If you shoot paper at noon, it mostly is not.
Spend serious money on the scope only once the mounts, the zero and your position are right. An expensive scope in cheap, unevenly torqued rings performs like the rings.
Matching the scope to UK disciplines
Stalking
A moderate variable (2-10x or 3-12x), a simple reticle you can see against a dark animal in dark cover, capped turrets and, if the budget allows, an illuminated centre dot for first and last light. Weight matters more than the brochure admits, because you carry a stalking rifle far more than you fire it.
Practical and Civilian Service Rifle
Speed at close targets plus enough magnification for 300 to 500 m points straight at the LPVO: a true 1x for both-eyes-open shooting and 6x or 8x at the top. Daylight-bright illumination is worth paying for; a dim reticle at 1x defeats the purpose. See what is an LPVO?
Rimfire and club target work
Prioritise parallax that suits short range over magnification. Many centrefire scopes are parallax-fixed at 100 yards and will frustrate you at 25 to 50 m. Look for side focus down to 25 yards, as on the Burris Signature HD, or a scope set for 50 yards, such as the Burris Droptine 3-9x40 Rimfire.
Long-range precision
A first focal plane reticle, a 34 mm tube, exposed zero-stop turrets and proven tracking. This is the one discipline where high magnification and high spending genuinely pay off.
UK note
A scope is not among the component parts that the Firearms Act 1968, s.57 treats as a firearm; that list covers barrels, chambers, cylinders, frames, bodies, receivers and breech mechanisms. Your firearms licensing department can confirm anything specific to your certificate. UK ranges and zeroing distances are usually in metres, while most scope data is in yards, so check which unit a parallax or BDC setting assumes.
Whatever the discipline, buy the scope as a system: rings or a one-piece mount of the correct height and diameter, a torque driver, and time on the range to verify zero and tracking. We do not stock scope rings or scope mounts, only red dot mounts, so source those from a specialist; our mount height and eye relief guide explains what to buy.
Frequently asked questions
Is a 3-9x40 still a sensible choice?
Yes. It covers woodland stalking, rimfire and general centrefire work, with a 4.4 mm exit pupil at 9x, often in a light 1 inch tube. The trade-offs still suit most real shooting.
Do I need an illuminated reticle?
For dawn and dusk work against dark backgrounds, a dim red centre dot really helps. For daylight target shooting it adds cost and batteries for little return. If you buy one, get one with an off position between brightness settings.
How much should I spend on mounts?
Plan on a meaningful fraction of the scope's price. Quality rings or a one-piece mount, correctly torqued, are what keep the zero when the rifle knocks against a high seat. Cheap mounts cause more "won't hold zero" problems than scopes do.
Is a second-hand scope worth buying?
It can be, if you can test it. Check the glass for fungus and scratches, run the magnification and parallax through their range, and shoot a box test to confirm the turrets track and return to zero.
Shop this guide
- Rifle Scopes — the full range, from 3-9x40 hunting scopes to 5-25x precision scopes.
- Deer Stalking Scopes — scopes suited to UK woodland and hill stalking.
- LPVO Rifle Scopes — 1-6x to 1-10x for practical and service rifle.
- Burris Rifle Scopes — Droptine, Fullfield and Signature HD hunting scopes.
