Yea, just not the same. None the less, back to the popcorn................
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RC, instantly when the bullet leaves the end of the barrel two things happen, it starts falling toward the earth and it begins to lose velocity, nothing will increase the velocity unless it has a rocket boost.
A bullet doesn't technically start falling until it reaches the apex of its trajectory, not when it leaves the barrel. Now the other part of your statement is true. However, I'm sure redirecting the hot gasses escaping the barrel and other ejecta might cause a more correct velocity over a traditional chronograph so you could technically gain some velocity. I know I have less errors with my chrony at 20-25 feet than I do inside of 20 feet.
I have listened to several shooters who claim the bullet is actually still accelerating (somewhat) as it's still being pushed by the gases leaving the muzzle. According to them the bullet doesn't actually slow until it's beyond the influence of the muzzle blast. Probably why the condition of a rifle's crown is so critical ad the "bubble" needs to remain uniform so the path of the bullet isn't altered as it leaves this "zone".
I believe Arky 223 was referring to a bullet shot from a horizontal barrel. Yes, you can elevate the barrel to correct for this but his statement is correct for that level barrel.
I don't know anyone who shoots from a horizontal barrel, if you're using a rifle as designed (aiming with sights or optics) you won't ever have a horizontal barrel. Even if you do level the barrel to be horizontal depending on the flex of the barrel during firing you might have an upward trajectory, of course the opposite might happen as well.
I don't like to assume anything, but it's been five days. I doubt the OP will come back with the results from shooting the rifle again to tell us what he found out.
I was referring to any falling body, whether it is being shot in an arc or on the level. It still falls at the same rate. Depending on the highth of the arc which determines the distance it wil lhit the earth down range.