.357 Magnum Ammo Prices & Cost Per Round
Real-time price tracking across 4 retailers. Updated every 2 hours.
Track .357 Magnum ammo cost per round in real time across 4 retailers. We're monitoring 12 .357 Magnum products (7 priced offers with CPR data) with box prices starting at $17.95. The typical cost per round is $0.72, with the best deal at $0.64/round. Prices are updated every 2 hours. Click any product to see its full price history and set a price drop alert.
Median .357 Magnum cost per round on September 24, 2026: $0.72 across 7 in-stock listings tracked by Firearm Data Lab.
.357 Magnum Ammo Buying Context
.357 Magnum ammo searches usually compare magnum revolver loads, defensive ammunition, and range-friendly options. This tracker keeps live .357 Magnum prices, cost per round, and in-stock status together so shoppers can judge value without mixing it up with .38 Special.
Use this page to compare .357 Magnum ammunition across retailers, then follow related handgun and revolver hubs when benchmarking magnum ammo against .38 Special, 10mm, or .44 Magnum.
.357 Magnum Cost Per Round History
.357 Magnum Price by Month
| Month | Median CPR | Lowest CPR | Change |
|---|---|---|---|
| September 2026 | 110.5¢/rd | 52.0¢/rd | -0.8% |
| August 2026 | 111.3¢/rd | 53.9¢/rd | -10.2% |
| July 2026 | 123.9¢/rd | 53.9¢/rd | -0.7% |
| June 2026 | 124.8¢/rd | 44.8¢/rd | -1.7% |
| May 2026 | 127.0¢/rd | 44.8¢/rd | +1.1% |
| April 2026 | 125.6¢/rd | 52.0¢/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.
Frequently Asked Questions
What is a good cost per round for .357 Magnum?
The best cost per round we're currently tracking for .357 Magnum is $0.64/round. A typical CPR across 7 tracked offers is $0.72/round. Prices vary by brand, grain weight, and retailer.
Is .357 Magnum ammo cheap right now?
The typical cost per round for .357 Magnum is $0.72. Check our CPR trend chart above to see if current prices are above or below the 30-day average. Set a price alert to get notified when prices drop.
Where can I find the cheapest .357 Magnum ammo?
Based on our real-time tracking across 4 retailers, the cheapest .357 Magnum ammo starting at $17.95/box. We compare prices from Bereli, E-Commerce Arms, Palmetto State Armory, SGAmmo and more.
What should I compare when shopping for .357 Magnum ammo?
Compare .357 Magnum ammo by cost per round, bullet type, intended use, and stock status. Magnum defensive or hunting loads often price higher than basic range ammunition.
Other Calibers
All .357 Magnum Ammo — Lowest CPR First
