Help...Finished PB Bullet Did Not Fit in Chambers

As a boy before taking any classes in Physics I learned a bullet fired horizontally and dropped simultaneously hit the ground at the same time. It's food for thought. Many have to think about that for a little while. Later on in life I had to worry events that occurred in time as opposed to that in distance. Or in the case of modern electronics in terms of frequency or in time. Now concerning the influence of a gas check which is inverted at the base of the bullet the questions come to mind does the check have any affect on the bullet as it seems to drag in a very long way. So for the sake of argument I'll pick and average velocity of 1000ft/sec. , probably a wee bit high. I have found checks 70 to 200 feet down range. In terms of distance that seems a long way. In terms of time it's only .07seconds at 70 feet. However, the dead give away is the check cannot be influencing the bullet as it had to have separated quite early. You see the check could only fall less than an inch in that time yet there it is on the ground dropping two to three feet. Now with gravity seemingly the same everywhere the check must be blown to the ground, turbulence etc. How some checks could make it to 200 feet I don't know. I just thought I share this notion and the question of inverted checks as the question has been posed to me many times generally surrounding “plain base“ bullets. Charlie