Most likely cause based on your bullets 'plopping' out is that you did not seat the bullet tightly against the pellets. Do not crush the pellets. You need to be sure that the resistance you feel is contact with the pellets.
It is possible that you are getting resistance from powder residue and thinking you are fully seated. If you feel resistance when cleaning, keep running the patch until there is no contact other than tapping the bottom of the bore/against the breech. This 'crud ring' can occur with loose powder as well.
As noted above, measure the length of ramrod sticking out of the barrel while EMPTY. Then load your pellets or powder, measure again. I suggest putting a length of tape (painters tape is a good option) on the rod. Now use a maker to indicate your depth with pellets/powder. Next you can, by eye, hold your bullet above that mark and add another... now you know how deep your rod should be when loaded and properly seated. Load the bullet, check your mark on the tape, re-mark if necessary.
Beginners often make most of their mistakes on the loading procedure and process. Mistaking the seating of a bullet or round ball is a frequent one. Another issue is often caused by talking or being interrupted mid process, often times by the wife, and dry-loading your gun. Been there, done that.
It is possible that you are getting resistance from powder residue and thinking you are fully seated. If you feel resistance when cleaning, keep running the patch until there is no contact other than tapping the bottom of the bore/against the breech. This 'crud ring' can occur with loose powder as well.
As noted above, measure the length of ramrod sticking out of the barrel while EMPTY. Then load your pellets or powder, measure again. I suggest putting a length of tape (painters tape is a good option) on the rod. Now use a maker to indicate your depth with pellets/powder. Next you can, by eye, hold your bullet above that mark and add another... now you know how deep your rod should be when loaded and properly seated. Load the bullet, check your mark on the tape, re-mark if necessary.
Beginners often make most of their mistakes on the loading procedure and process. Mistaking the seating of a bullet or round ball is a frequent one. Another issue is often caused by talking or being interrupted mid process, often times by the wife, and dry-loading your gun. Been there, done that.