GS employment, work networking group and business directory.The GUN LAWYERS board –Free gun related legal advice.Where the powder burns out is of very limited importance. My point is, choose the barrel length for optimal accuracy with your specific load. The latter mostly with open sights, as a longer sight radius is advantageous here. So, generally the short (22") barrels are getting the best precision. Having a barrel length that does not produce the maximum velocity may not be detrimental to achieving that kind of accuracy. If precision shooting is your game, then you will likely lean towards subsonic bullets, as the trans-sonic region tends to destabilize bullets and so ruins your rifle's fine accuracy potential. This may (or may not) be bad for accuracy, but it certainly does not help to flatten the trajectory. This may be hard to believe, but beyond some point the pressure behind the bullet actually decreases to the point that the barrel friction starts to slow the bullet down. What is more important is at what barrel lenth the muzzle velocity is the highest. At what point exactly the powder burns out is actually quite irrelevant, except if muzzle flash is a concern. Yes, most 22LR's will burn up all the powder in a specific cartridge within 16" of bullet travel, but likely much less than that. Which does not matter, since it is a pretty useless variable anyway. A 22lr burns up all its powder in 16" of barrel length.
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