Real-time price tracking across 5 retailers. Updated every 2 hours.
Track 300 Blackout ammo cost per round in real time across 5 retailers. We're monitoring 25 300 Blackout products (7 priced offers with CPR data) with box prices starting at $16.99. The typical cost per round is $0.82, with the best deal at $0.72/round. 300 Blackout prices are down 8.8% over the past week compared to the previous three weeks. Prices are updated every 2 hours. Click any product to see its full price history and set a price drop alert.
Median 300 Blackout cost per round on July 9, 2026: $0.82 across 7 in-stock listings tracked by Firearm Data Lab.
300 Blackout ammo sits in a useful middle lane for AR-pattern rifles: shoppers often compare supersonic range loads, subsonic suppressor loads, and defensive ammunition on the same search. This tracker keeps those .300 Blackout ammo prices together so cost per round and stock signals are easier to compare.
Use this page when you are comparing 300 Blackout ammunition across retailers, then follow the related rifle-caliber hubs below when you want to benchmark it against common alternatives.
300 Blackout listings vary heavily between supers, subs, range loads, and defensive ammo. Use current CPR and use-case labels to compare similar .300 BLK offers instead of only sorting by box price.
| Month | Median CPR | Lowest CPR | Change |
|---|---|---|---|
| July 2026 | 130.0¢/rd | 68.0¢/rd | -13.4% |
| June 2026 | 150.0¢/rd | 64.5¢/rd | -3.2% |
| May 2026 | 155.0¢/rd | 61.5¢/rd | +3.3% |
| April 2026 | 150.0¢/rd | 80.0¢/rd | — |
Median and lowest observed cost per round per calendar month, from in-stock listings tracked across supported retailers.
The best cost per round we're currently tracking for 300 Blackout is $0.72/round. A typical CPR across 7 tracked offers is $0.82/round. Prices vary by brand, grain weight, and retailer.
The typical cost per round for 300 Blackout is $0.82. Over the past week, median prices are down 8.8% compared to the previous three weeks — a good window to buy. Set a price alert to get notified when prices drop.
Over the past week, 300 Blackout prices have dropped 8.8% — the median cost per round moved from 142.5¢/rd to 130.0¢/rd. This is measured across in-stock products only and compares the last 7 days to the previous 23 days.
Based on our real-time tracking across 5 retailers, the cheapest 300 Blackout ammo starting at $16.99/box. We compare prices from Bereli, Brownells, E-Commerce Arms, GrabAGun and more.
Compare cost per round, bullet type, and whether the load is subsonic or supersonic. 300 Blackout ammunition can vary widely by intended use, so a low range-ammo CPR is not always comparable to a defensive or subsonic load.
Personal project, transparent tracking. Some retailer links may earn a commission. See something confusing, missing, wrong, or worth adding?