20 vartarg barrel length

[TinMan]

I agree that the difference is not that much. For a point of reference, years ago, I collected every 223/5.56 rifle I could get my hands on among from friends, ARs, bolt guns, TCs, and had barrel lengths ranging from 8 inches to 26 inches. I used the same 55gr FMJ ammo and ran them through my chronograph using 5 shots per rifle. Collected the data and did the linear regression. The result was 29fps difference per inch of barrel length. The other thing I remember markedly is that on very short barrels, the muzzle blast and shock was much greater.

[Oso Polaris]

Originally Posted by TinMan

I agree that the difference is not that much. For a point of reference, years ago, I collected every 223/5.56 rifle I could get my hands on among from friends, ARs, bolt guns, TCs, and had barrel lengths ranging from 8 inches to 26 inches. I used the same 55gr FMJ ammo and ran them through my chronograph using 5 shots per rifle. Collected the data and did the linear regression. The result was 29fps difference per inch of barrel length. The other thing I remember markedly is that on very short barrels, the muzzle blast and shock was much greater.

Before buying a particular caliber or rifle setup, I will do a search ("Google it") to see if someone has done an analysis on barrel length / velocity for a given caliber. It allows for some quick analysis on best "Effective Length". I like it when people do the leg work and I don't have to OCD. Charts are nice.

Unfortunately, you Varmint Guys cherish your rifles too much. It sure would be handy if a couple of .17 and .20 cal guys would start lopping off an inch of barrel at a time and record the velocity changes … in the name of Science.

Here's a great example: