How-To Guide · Updated Aug 2026
The ISSF-standard beginner's guide to zeroing any Camstar air pistol at 10 metres. Sight adjustment, group analysis, and the mistakes that cost you weeks of drift.
Written by the Camstar Sports engineering team · Last updated 10 August 2026
Quick Answer
Zero an air pistol at 10 metres in six steps: fire 3-5 warm-up shots, shoot a 5-pellet baseline group at centre, measure the offset from aim point to group centre, adjust the rear sight in quarter-turn increments (each full turn moves impact ~8-12mm at 10m), confirm with a fresh 5-pellet group, then lock in with a 10-shot confirmation group. A proper zero takes 30-50 pellets and ~30 minutes. Always zero with the pellets you plan to shoot regularly — switching pellet brand changes the point of impact.
Zeroing corrects a mechanical offset between the sight line and the pellet trajectory. It does not fix inconsistent grip, unclean trigger squeeze, or breath-timing problems. A pistol that's been zeroed properly will still throw wild shots if the shooter's technique is inconsistent — zeroing just ensures that when you do everything right, the pellet lands where you were aiming.
Every Camstar Sports pistol ships pre-zeroed at 10 metres with match-grade pellets from our Kanpur facility. Most owners only need to re-zero after switching to a different pellet brand, after long transport (rough couriers can knock sights a fraction of a millimetre), or if they're setting up a new home range at a distance other than the shop's test distance.
Fire 3-5 shots into the trap without trying to hit the centre. For CO₂ pistols like the Star RX Gen 3, this warms the cartridge from ambient temperature — a cold cartridge gives lower velocity for the first shots and would throw off your zero. For spring pistols like the Star Leo, warm-up shots settle the piston lubrication into consistent operation. These shots do NOT count toward zeroing.
Aim at the centre bullseye. Shoot 5 pellets, slow-fire, with 15-20 seconds between shots. Focus on the same grip pressure, same trigger squeeze, same breath timing for every shot. Do not adjust the sights during this group — just shoot and see where the group lands.
Walk to the target. Draw or imagine a circle around your 5 pellet holes — that's your group. The centre of that circle (not any individual hole) is your point of impact. Measure how far the group centre is from the aim point in millimetres, both horizontally (windage) and vertically (elevation).
Example: your group is 3cm right and 2cm high of centre. You need to move the impact 3cm LEFT and 2cm DOWN.
On the Star RX Gen 3, the rear sight has two small screws — windage (horizontal) and elevation (vertical). The convention: turn the windage screw counter-clockwise to move impact LEFT; turn the elevation screw clockwise to move impact DOWN (this lowers the rear sight, which raises the muzzle at the target end, pushing shots lower).
Each full turn moves the impact roughly 8-12mm at 10 metres — so a 3cm correction is about 3 full turns of the windage screw. Use quarter-turn increments after the first correction to avoid overshooting.
Rule of thumb: Always shoot a 5-shot group AFTER each adjustment before making the next one. Chasing single shots is the #1 zeroing mistake — one shot tells you nothing about the pistol; it tells you about that one shot.
Shoot another 5-pellet group at the centre bullseye. If it's on or near centre, you're zeroed. If not, measure the remaining offset and make one more sight adjustment. Most owners finish in 2-3 rounds of adjust-and-confirm.
Shoot a final 10-pellet group to confirm the zero holds. Save this target with the date written on it — it's your baseline. In future sessions, if your groupings drift, comparing to this baseline tells you whether it's the pistol (unlikely) or your technique (likely).
What does it mean to "zero" an air pistol?
Zeroing an air pistol means adjusting its sights so that the pellet hits exactly where the sights are aimed at a specific distance — for ISSF-style target shooting in India, that distance is 10 metres. Before you zero, your groupings can be tight but consistently offset (say 3 cm high and left of centre); after you zero, those tight groups sit on the bullseye. Zeroing does not fix inconsistent shooting technique — it only corrects a mechanical offset between the sight line and the pellet trajectory. You still need to hold the pistol the same way every shot and squeeze the trigger cleanly; zeroing simply ensures that when you do those things correctly, the pellet lands where you were aiming. Every Camstar Sports pistol ships pre-zeroed at 10 metres with match-grade pellets, so most owners only need to re-zero after switching pellet brands or after long transport.
How many shots does it take to properly zero an air pistol?
A proper zeroing session takes 30-50 pellets: 5-10 shots to establish your baseline group, 5-10 shots per sight adjustment (typically 2-4 adjustments), and 5-10 confirming shots after the final adjustment lands your group on centre. Rushing this by taking single shots and adjusting after each is the most common mistake — a single shot tells you nothing about the pistol; it tells you about that one shot. You need a 3-5 shot group to distinguish the pistol's point of impact from your own inconsistency. Shoot slowly with 15-20 seconds between shots to let the barrel settle and your focus reset. For a CO₂ pistol like the Star RX Gen 3, keep pace slow enough that the cartridge doesn't cool significantly (which changes velocity and drops the point of impact).
Should I use my own pellets or the ones that came with the pistol?
Always zero with the pellets you plan to shoot regularly — different pellet weights and shapes hit different points of impact. A 0.51-gram wadcutter and a 0.47-gram hollow-point will land in different spots at 10 metres from the same pistol; if you zero with one and shoot the other, you'll be chasing zeros you never actually set. Camstar recommends Star Match Diabolo pellets (₹450 per tin of 300) — the 4.5mm wadcutter design is what every Camstar pistol is factory-tuned to, and it cuts the cleanest holes in paper for easy scoring. If you plan to shoot heavier or lighter pellets, buy a tin of your chosen pellet FIRST, then zero using them. Do not switch pellet brand mid-competition — velocity and drop change enough to blow your groupings apart.
What does a "cold-bore" first shot mean and does it matter for air pistols?
In firearms shooting, "cold-bore" refers to the first shot from a cool barrel, which often lands slightly differently from subsequent shots because the barrel temperature affects rifling grip on the projectile. For CO₂ air pistols like the Star RX Gen 3, the effect is real but small (~2-4mm at 10 metres) — the first shot from a warm CO₂ cartridge in Indian summer conditions is essentially identical to the third shot. For spring air pistols like the Star Leo and Mauser X Matte, cold-bore effect is minimal because there is no heat exchange during firing. What matters more for airguns is cold-cartridge effect on CO₂ pistols: a cartridge left in the pistol overnight will be at ambient temperature and give lower velocity for the first 3-5 shots as it warms from the shooter's hand. Fire 3-5 warm-up shots before zeroing.
How do I adjust the sights on my Camstar pistol?
The Star RX Gen 3 rear sight is adjustable for both windage (left/right) and elevation (up/down) using a small flathead screwdriver. To move the point of impact RIGHT, turn the windage screw clockwise; to move it UP, turn the elevation screw counter-clockwise (raises the rear sight, which drops the muzzle at the target end, pushing shots higher). Each full turn moves the impact roughly 8-12mm at 10 metres — use quarter-turn increments after the first correction. The Star Leo and Mauser X Matte use fixed front and adjustable rear sights with the same convention. Always shoot a 5-shot group AFTER each adjustment before making the next one — chasing single shots leads to overshoot in both directions. If a sight refuses to adjust, WhatsApp us at +91 83296 18409 and we'll walk you through it.
What is a good group size at 10 metres for a beginner?
For a first-time shooter with proper technique, a 5-6 cm 5-shot group at 10 metres is normal in the first month; a 3-4 cm group is the practical intermediate target after 3-6 months of daily practice; a sub-2 cm group is where competitive shooters live and takes 12+ months of coached practice to reach consistently. If your groups are 8 cm+, the pistol is probably fine — technique is the limiter, and 200-300 shots per week of focused dry-fire and slow-fire practice will shrink groups faster than any equipment upgrade. If your groups are inconsistent (some 3 cm, some 8 cm on the same session), the variable is your grip pressure or trigger squeeze — pick one to focus on for a week and the pattern will settle. Every Camstar pistol is capable of sub-2 cm groups in the right hands.
Zeroing takes 30 minutes and pays off for years. All Camstar Sports airguns ship pre-zeroed with match-grade pellets — start with the one that suits your budget.
Star RX Gen 3 (₹24,500) →Or the Star Leo (₹6,900) →