Choosing what to shoot — and what to stockpile — comes down to cost-per-round. Ammo prices vary dramatically across calibers, and the cheapest option for your use case isn't always obvious. A caliber that costs 50% more per round isn't necessarily a bad choice if it means significantly less range time needed per training session.
This guide compares current (April 2026) pricing for the most popular calibers, broken down by training use case, defensive use case, and bulk pricing potential.
Quick Comparison: Cost Per Round by Caliber (April 2026)
| Caliber | FMJ/Training | JHP/Defensive | Bulk (1K rds) | Training Cost/Month* |
|---|---|---|---|---|
| 9mm Luger | 27–32¢ | 65–120¢ | 25–28¢ | ~$27–32 |
| .223 Rem / 5.56 NATO | 33–40¢ | 75–150¢ | 30–36¢ | ~$33–40 |
| .45 ACP | 38–48¢ | 80–140¢ | 35–44¢ | ~$38–48 |
| .308 Win / 7.62x51 | 55–80¢ | 140–250¢ | 50–70¢ | ~$55–80 |
| .40 S&W | 35–44¢ | 75–130¢ | 32–40¢ | ~$35–44 |
| 5.45x39 (AK) | 25–35¢ | 60–100¢ | 22–30¢ | ~$25–35 |
| 7.62x39 (AK) | 28–38¢ | 70–120¢ | 25–34¢ | ~$28–38 |
| 12 Gauge (buckshot) | 55–85¢ | 150–300¢ | 50–75¢ | ~$55–85 |
*Training cost assumes 100 rounds/month of typical range training.
The verdict: 9mm wins the cost-per-round battle for handgun calibers by a significant margin. For rifle calibers, 5.45x39 and 7.62x39 undercut .223/5.56 — but require an AK-pattern rifle. If you're buying a new firearm specifically for cost-efficient practice, 9mm handgun or AK-platform rifle gives you the most rounds per dollar.
Caliber Deep Dives
9mm Luger — Best overall value for handgun shooters
The most popular handgun caliber in the US, with maximum manufacturer competition keeping prices low. Terminal performance of modern 9mm JHP has largely closed the gap vs. .40 S&W and .45 ACP for defensive use, while costing significantly less per round. Near-universal firearm compatibility is a bonus for shooters running multiple platforms. Full 9mm price guide →
.223 Rem / 5.56 NATO — Most popular rifle caliber
Standard AR-15 / MSR caliber. Massive domestic production keeps prices reasonable relative to other rifle cartridges. Note: .223 Rem and 5.56 NATO are similar but not identical — 5.56 chambers can run .223, but .223 chambers should not run 5.56 pressure loads. Verify your chamber before mixing. Ammo availability is excellent across all major retailers.
.308 Win / 7.62x51 NATO — Precision and battle rifle caliber
Significantly more expensive than 9mm or .223, but used in applications where those calibers can't substitute. If you're running a precision bolt gun or a battle rifle for longer-range use, .308 is the price of entry. Budget military surplus/import .308 FMJ can be found in the 50–55¢ range. Match-grade for precision work runs $1.50–4.00/round depending on brand.
.45 ACP — Classic 1911 / large-frame handgun caliber
Runs 30–50% more expensive than 9mm for equivalent FMJ training ammo. If you're already running a .45 ACP platform, the price premium is the cost of the caliber choice. If you're deciding between .45 and 9mm for a new purchase, modern 9mm JHP defensive ammunition has made the terminal performance argument largely moot — and you'll spend significantly less per year on training.
Training Budget Analysis: Annual Cost by Caliber
If you shoot 200 rounds/month for practice (a reasonable baseline), here's what that costs annually across calibers:
| Caliber | 200 rds/month | Annual Cost | vs. 9mm Premium |
|---|---|---|---|
| 9mm Luger | ~$58–64/mo | ~$696–768/yr | — |
| .223 / 5.56 | ~$68–80/mo | ~$816–960/yr | +$120–192/yr |
| .40 S&W | ~$70–88/mo | ~$840–1,056/yr | +$144–288/yr |
| .45 ACP | ~$76–96/mo | ~$912–1,152/yr | +$216–384/yr |
| .308 Win | ~$110–160/mo | ~$1,320–1,920/yr | +$624–1,152/yr |
The .308 vs. 9mm annual gap is particularly stark: shooting 200 rounds/month, you'd spend $600–1,100 more per year on .308 vs. 9mm. That's nearly the cost of another firearm. This is why many multi-caliber shooters use 9mm for their volume handgun practice and reserve .308 for slower, targeted long-range work.
Live Price Tracking by Caliber
RoundHawk tracks all the calibers above (and more) across 15 retailers. The price dashboard shows current best prices, and you can set alerts on any caliber to catch deals as they appear.
Current prices for all calibers are visible on the deals page, sortable by caliber and cost per round.
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