Minimum loads seem to have a lot of empty space, safety/accuracy concerns?

[HT0317]

I just finished up my first batch of 300 win mag. I'm pushing 230 gr bergers with H4831SC. I started at the minimum and went up in .5 gr increments for 5 separate loads. I plan to use these for my first experimental range day and load some of the hotter ones later and compare groups. The loaded rounds seem to have quite a bit of empty room in them, I shoot one side by side with LC118LR and mine sound quite a bit louder. I'm aware this is not ideal for consistency, and consistency is accuracy, but is there a safety concern if I never loaded bellow the minimum? I'm assuming that the loads near the top-end of the load data will have less room. Any input on this matter would be greatly appreciated.

 

[nso123]

The heavy pills are what makes the charge seem so low. Looking at the Hodgdon data, there is only a 6 grain window on that load, so I would suspect you would not notice a whole lot of difference in the amount of unfilled case even at the hottest loads.