450 Bushmaster 16 Vs 20

According to quickload modeling software, the difference in velocity with a load pushing the hornady 250 ftx ahead of 38gr of lil gun, is at 16 inches, the bullet is moving. I could get through 20 rds no problem off the bench. However, any more than that and my shoulder started to get tired. Comparatively, this barrel is right on the heels of a. 338 win. Picked up a 20 bush 450b upper yesterday.

I have been doing some looking around and havent seen too threads quantifying the advantages disadvantages on the two different lengths. Other than the obvious weight and portability differences are there any other. The bushmasters' 16 & 20 both use the carbine gas length tubes. There has been mucho discussion on this an i will bow out and let tim explain this brain exploding subject. Using factory hornady ammo, the measured velocity difference between our 16 and 20 450 barrels is 75 fps.

So it really doesn't matter which one you choose just go with the. I prefer the feel and handling of the 16 barrel. Both the 16 and 20 inch barrels use a 16 gas tube scheme, bushy adds a second gas block up front on the 20 to mount a front sight. I went with the 16 as it is shorter, lighter and quicker handling. I have seen no demonstrated advantage to the 20 barrel. In my experience there is more variation in. I believe they use the same bullet. The 450 is a little faster, thus shoots a little flatter. I doubt there is much difference at realistic ranges. Neither is meant to be a long range.