y_not5
Help me out a bit, I am not really all that familiar with the sidekick... When you load the SST in a clean barrel how much force is required to push the bullet and sabot down the barrel?
Since you a loading Hornady SST's you are probably being supplied sabots from MMP, usually these will be the HPH-12 variety and they are normally the thickest. I am assuming you are shooting a 45 cal 250 grain SST with a black sabot? Turn the sabot over and look at the cup - it should have 2 small ledges (steps) inside the cup and a number stamped in the bottom.
One other thing you might need to do is experiment a little with the powder charge... It would be my suggestion to start --- never mind you are using pellets -not may options there.
Back to the original thought loading it all into a clean barrel, how difficult to get the SST down - do you have to use a short starter or can you just push the bullet and sabot down with your thumb or the ram rod?
One last thought - not all guns shoot all bullets well - but again I do not know enough about the sidekick..
Your trip is getting here awful fast and I am worried about your confidence in the gun you are shooting...