It could be done that way and would be faster with the TC speed breach than a normal screw in but there may be other problems with that technique. For one, the breach end is not designed to load the bullet from that end and thus may damage the bullet as it goes over the sharper edges that the breach seals against. It will also be harder to keep the bullet lined up with the bore and may load at an angle and/or scrape some of the metal off one side or the other. If your using powder instead of pellets you run the risk of getting powder in the breach plug threads. On some guns it would require the removal of the bolt or plunger slowing the reloading further. There are probably other issues that could be included but thats enough for me not to try it.