Thread: How much is over fill in 223

Hiya guys I am loading for a mate who has read that varget is the greatest powder known to man for 223 and wants some made for him.
I am using 55 gr Nosler and started low as one would and have ended up at 27.5 gr which is bang on 3000 fps which is great the groups are good but the load is basically level with the top of the shell which to me seems high but thus far has been consistent with cases weighed prior for uniform weights.
Is there a down side to doing this I dont know about yet ???
thanks in advance