Two points I always make:
First, just because nobody has ever been convicted because they used handloads (NJ vs Bias notwithstanding) does NOT mean nobody ever will. Smugly repeating that line will be no comfort to the first unlucky SOB who is.
Second, you can prevent that from ever happening to you simply by using factory ammo for carry and handloads for practice.
The way to prevent an unfair conviction is to not use a weapon in a questionable situation, the load is not the most important factor to consider
