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 13 300 Blackout products (4 priced offers with CPR data) with box prices starting at $34.14. Prices are updated every 2 hours. Click any product to see its full price history and set a price drop alert.
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 |
|---|---|---|---|
| September 2026 | 125.9¢/rd | 59.9¢/rd | +2.6% |
| August 2026 | 122.7¢/rd | 59.9¢/rd | -12.6% |
| July 2026 | 140.5¢/rd | 59.9¢/rd | -0.7% |
| June 2026 | 141.5¢/rd | 62.0¢/rd | +0.7% |
| May 2026 | 140.5¢/rd | 61.5¢/rd | -9.4% |
| April 2026 | 155.0¢/rd | 62.0¢/rd | — |
Median and lowest observed cost per round per calendar month, from in-stock listings tracked across supported retailers.
Want the whole market instead of one caliber? The Ammo Price Index chains these monthly medians across a fixed 12-caliber basket into a single month-over-month benchmark.
Based on our real-time tracking across 5 retailers, the cheapest 300 Blackout ammo starting at $34.14/box. We compare prices from Bereli, E-Commerce Arms, GrabAGun, Palmetto State Armory 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.
