Anzio Ironworks specializes in high quality 50 BMG Rifles and Ammunition.

Barrel Length vs. Feet per Second

The following contains some general guidelines to determine the effect of barrel length on range and bullet speed. Ammunition, especially surplus military, varies widely in performance. We based the following on a 700 grain US military round.

To maintain accuracy the bullet must stay supersonic. Every inch of barrel adds more weight and makes the rifle more unwieldy. So pick the right barrel length for your needs.

Here is the breakdown:

17" - 29" Barrel Length

Graph
 

     FPS

Inches Min* Max*
17" 2236 2236
18" 2261 2271
19" 2286 2306
20" 2311 2341
21" 2336 2376
22" 2361 2411
23" 2386 2446
24" 2411 2481
25" 2436 2516
26" 2461 2551
27" 2486 2586
28" 2511 2621
29" 2536 2656
  • 17" barrel - 2236 FPS (feet per second), accurate to approximately 1600 yards. 
  • You generally gain approximately 25-35 FPS per inch of barrel over 17", then drops lower at 29".

 

 

 

 

 

 

 

 

 

 

 

 

29" - 39" Barrel Length

Graph
 

     FPS

Inches

Min*

Max*

29" 2656 2656
30" 2674 2677
31" 2692 2698
32" 2710 2719
33" 2728 2740
34" 2746 2761
35" 2764 2782
36" 2782 2803
37" 2800 2824
38" 2818 2845
39" 2836 2866
  • 29"-32" barrel - Is the ideal in terms of long range, weight, and powder usage. 2656 FPS, accurate to approximately 2200 yards.
  • You generally gain approximately . 18-21 FPS every inch over 29", then drops lower at 40".

 

 

 

 

 

 

 

 

 

  

40" Barrel Length

  • 40" barrel - 2876 FPS, accurate to approximately 2500 yards.

 

*All estimates are dependent on a variety of factors such as quality of ammunition used, altitude, weather, etc. and should be treated as such.

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