Hey I was wondering how much different barrel lengths would effect the speed of the bullet. For example like the nosler reloading book says for a .223 rem with a 50 gr bullet with a case overall length of 2.260 with so and so powder it says it shoots 3350 fps. I do that and notice that they shoot about 3050 fps. The only difference is barrel between my load and there's. Would 2 inches of extra barrel length make that big of a difference?