When you swing over a bullet, you’ll rarely get a clean, locked-in VDI number. Orientation, alloy composition, depth, and soil mineralization all pull the reading in different directions. Most bullets fall between VDI 20–65, depending on caliber and material, but that range overlaps heavily with coins. Lead reads differently than copper-jacketed rounds, and each detector brand assigns its own numbers. The full breakdown of ranges, tones, and brand-specific values is covered ahead.
Key Takeaways
- Bullets produce inconsistent, jumping VDI readings unlike coins, influenced by orientation, depth, alloy composition, and nearby iron or mineralized soil.
- .22 caliber rounds read 20–35 VDI, mid-sized pistol bullets 35–55 VDI, and larger rifle bullets or musket balls 45–65 VDI.
- Copper-jacketed bullets can resemble coins like nickels in VDI readings, requiring multiple sweep angles to distinguish them accurately.
- Different detector brands assign varying VDI values; a .22 bullet may read differently on Minelab, Garrett, or Nokta detectors.
- Cross-referencing tone, depth, and VDI improves identification, as bullets typically produce mid-to-low, inconsistent tones compared to steady coin signals.
Why Bullets Produce Inconsistent VDI Readings
Bullets rarely produce a clean, consistent VDI reading because their signal depends on several interacting variables — orientation, depth, alloy composition, and surrounding soil conditions.
Bullets rarely lock onto a clean VDI — orientation, alloy, and soil conditions keep the signal constantly shifting.
When a bullet lies horizontally versus nose-down, its conductive surface area changes relative to your coil, directly shifting the VDI. Bullet characteristics like lead-core construction, copper jacketing, or oxidized surfaces further complicate the reading.
Lead registers lower conductivity than copper, so a jacketed round produces a different number than a plain cast ball.
Signal interference from nearby iron, mineralized soil, or adjacent trash compounds the inconsistency. You’ll often notice the VDI jumping rather than locking onto a single number — a behavioral pattern that separates bullets from stable coin targets.
Always cross-reference tone, repeatability, and depth before making a dig decision.
VDI Ranges for Common Bullet Types by Size
Different bullet sizes produce measurably distinct VDI ranges, giving you a practical baseline for field identification.
Small .22 caliber rounds typically register between 20–35 VDI, placing them near pull-tab territory.
Mid-sized pistol bullets, like 9mm or .45 ACP, commonly read 35–55 VDI depending on their target materials—lead cores read lower, while copper-jacketed rounds push higher.
Larger rifle bullets and musket balls often fall between 45–65 VDI, though oxidation and soil mineralization shift those numbers.
Buckshot reads erratically due to its small mass.
You shouldn’t rely on VDI alone, since bullet sizes overlap with legitimate coin signals.
Cross-reference depth readings, signal repeatability, and tone consistency to distinguish bullets from desirable targets before committing to a dig.
The Conductivity Overlap Between Bullets and Non-Ferrous Coins
Because lead and copper share conductivity ranges with several non-ferrous alloys used in coinage, your detector can’t reliably distinguish a jacketed bullet from a nickel or small bronze coin on VDI alone.
This conductivity comparison reveals a fundamental limitation: bullet characteristics like jacket thickness, core composition, and orientation directly shift VDI readings into coin territory.
A copper-jacketed .30 caliber round can register identically to a Jefferson nickel on multiple detector platforms.
Your best counter-strategy combines signal repeatability, depth consistency, and tone stability.
Bullets often produce slightly erratic VDI swings when you reposition the coil, while coins hold steady. Tilted or standing bullets exaggerate this instability further.
Cross-check every suspicious mid-range signal from multiple sweep angles before committing to a dig decision.
Bullet VDI Numbers on Minelab, Garrett, and Nokta
When you’re comparing bullet VDI readings across brands, you’ll find that Minelab, Garrett, and Nokta each assign different numerical values to the same target.
A .22 bullet, for example, may register in the low-to-mid range on a Minelab Equinox 600, while that same bullet shifts noticeably higher on a Garrett ACE Apex or a Nokta Legend.
You need to cross-reference each detector’s specific VDI scale to accurately interpret bullet signals in the field.
Bullet VDI by Brand
Bullet VDI numbers shift depending on the detector brand you’re running, so cross-referencing charts between machines is essential. A .22 slug reading 28 on a Minelab Equinox 600 might register 45 on a Garrett ACE Apex or 22 on a Nokta Legend.
Bullet weight and bullet shape directly influence these readings since denser, rounder projectiles produce higher conductivity signatures than elongated rifle rounds.
On Minelab machines, musket balls typically land in the low-to-mid VDI range. Garrett pushes those values higher across its scale. Nokta Legend keeps readings compressed in the lower registers for ferrous-adjacent targets.
You’ll need your specific machine’s chart to accurately predict what you’re hitting before you dig, because no two brands calculate conductivity values identically.
Comparing Detector Readings
Comparing VDI numbers across Minelab, Garrett, and Nokta detectors reveals measurable differences that directly affect how you identify bullets in the field. A musket ball on a Minelab Equinox 600 reads low-to-mid range, while the same target on a Garrett ACE Apex shifts noticeably higher due to differing conductivity scaling.
Nokta Legend places bullets within its own calibrated range, requiring you to reference brand-specific charts for accurate bullet identification techniques.
Metal detector sensitivity settings further complicate cross-brand comparisons, since higher sensitivity amplifies signal variation on corroded or irregular bullet shapes.
You can’t apply one brand’s VDI chart to another detector and expect reliable results. Document your findings per machine, test known bullets at measured depths, and build a personal reference log for consistent field accuracy.
Tone and Depth Signals That Identify a Bullet
Identifying a bullet by tone and depth requires you to analyze multiple signal characteristics simultaneously, not just the VDI number.
Bullets typically produce mid-to-low tones, often inconsistent due to their elongated shape and orientation in the soil. Rotating your coil over the target reveals whether the signal holds steady or jumps — a key target identification technique.
Depth matters considerably. A small .22 caliber bullet reads deeper than larger targets at equivalent depths, producing a compressed, quieter tone.
Larger projectiles register louder, shallower signals. Unlike coins, bullets rarely deliver clean, repeatable high tones. If your signal wavers between iron and non-ferrous readings, a bullet or war relic is probable.
Always cross-reference tone consistency, depth reading, and VDI together before deciding whether to dig.
The Dig-or-Skip Decision for Bullet Signals
Deciding whether to dig a bullet signal comes down to three variables: VDI consistency, tone behavior, and target depth. If your VDI holds steady across multiple sweeps and the tone repeats cleanly, you’re looking at a legitimate target worth recovering. Jumpy numbers and broken tones almost always mean iron trash.
Apply disciplined bullet identification techniques by sweeping from multiple angles. A genuine bullet maintains its VDI range regardless of coil direction. Erratic readings indicate irregular ferrous objects.
Sweep from multiple angles — a real bullet holds its VDI. Erratic readings mean iron. Trust the process.
For target recovery methods, factor in depth. Bullets typically read 3–8 inches deep. Shallow signals with high iron probability audio warrant skepticism.
Deep, stable, mid-range VDI readings in historically significant locations earn the dig. Trust your process, not just one variable.
Frequently Asked Questions
Can Metal Detectors Distinguish Between a Fired and Unfired Bullet?
Metal detectors can’t reliably distinguish fired from unfired bullets. You’ll notice bullet composition affects signal clarity, but both register similar VDI ranges. Rely on context, depth, and location to make that determination yourself.
Do Corroded Bullets Register Differently Than Clean Ones on Detectors?
Like rust eating a key, corrosion effects alter bullet composition, shifting your VDI readings lower and muddying tone clarity. You’ll notice unstable, jumping signals instead of clean, repeatable ones — reducing your detector’s ability to accurately identify the target.
How Does Soil Mineralization Affect Bullet VDI Readings Underground?
Soil mineralization shifts your bullet’s VDI readings unpredictably. High mineral content and dense soil composition introduce ground noise, forcing your detector to misread conductivity, pushing VDI numbers lower and making accurate bullet identification considerably harder.
Can Detector Coil Size Change the VDI Reading of a Bullet?
Yes, coil size can shift a bullet’s VDI reading. Larger coils reduce coil sensitivity to small targets, causing lower or unstable readings. Frequency impact also plays a role—you’ll notice VDI drift when switching coil configurations.
Do Lead-Free Bullets Produce Different Signals Than Traditional Lead Bullets?
Like copper versus zinc pennies shifting VDI, lead-free bullet materials absolutely change your signal. Their higher-conductivity lead composition produces elevated VDI readings compared to traditional lead, so you’ll notice distinctly different tones demanding your careful analysis.
References
- https://detectorwarehouse.com/blogs/news/how-to-identify-and-interpret-metal-detector-signals
- https://focusspeed.com/metal-detecting-vdi-nokta-the-legend-garrett-ace-apex-vdi-values/
- https://www.metaldetector.com/pages/learnbuying-guide-articlesgetting-startedtarget-id-chart-comparing-top-metal-detector-models
- https://www.findmall.com/threads/vdi-numbers.328655/
- https://www.youtube.com/watch?v=gCIbfen0F_w
- https://metaldetectingforum.com/index.php?threads/vdi-signals-on-nox-for-war-relics.274150/
- https://www.findmall.com/threads/target-id-numbers.358278/
- https://www.treasurenet.com/threads/x35-program-for.636922/
