While I do not have any input to the powder used, I will say anyone who intentionally seats a bullet ahead of the powder charge is a disaster waiting to happen. The bullet in this case acts as a blockage to the powder explosion and has caused many a barrel to explode. Do not under any circumstances ever, never, seat your bullet with a gap between it and the powder, it may be your last time period. If your lucky you may have both eyes and hands and most of your face left. Always seat the bullet firmly on the powder charge. When using pellets do not crush them just seat the bullet firmly on top. You will stay out of trouble by following this simple yet important rule. This practice has been the golden rule for obvious sound reasons. Please do not break this rule!