Realistically speaking no one really knows if this can/will be used against you. It might be a non issue in one state/county and a big deal in another. It's really up to the DA/attorney that is trying/suing you.
Any good prosecutor will use whatever he thinks he can that will help him win...that's his job. If he thinks he can make the jury think you wanted to shoot someone, or that you used ammunition that was particularly lethal (yeah, I know but that's the tact they will take...), or used a firearm that was modified to have a "hair trigger," he will. Remember, in jury selection (you will want a jury trial...) the other side will do their best to seat those they think would be most adversarial to your case. So, not only will your defense have to counter the allegations that the mere fact you owned a gun means that you are a homicidal nut-case just looking for a reason to whip out your undersized penis, errrr, I mean gun and shoot someone, or that the ammunition you used was hollow-point super, duper, gonna blow a hole in the bad guy the size of a dinner plate hole in him, or that you modified your gun's trigger to fire the gun with the lightest touch of your finger, he'll have to overcome any bias jury members may have about guns and gun owners.
The intent of some of these "suggestions" are rooted in trying to remove any potential for an over-zealous prosecutor to use against you. I do know that there are cases where the type of ammunition used, or modifications to the gun used, were elements in the prosecution. Massad Ayoob discussed one case where reloaded ammunition was used by the prosecutor. Not because of how "deadly" it was, but because of the forensic evidence for GSR. In short, there are references that reflect the GSR properties of commercial ammunition, how it disperses and remnant chemical compounds, which are noted in an investigation. In the case of reloaded ammo no such database existed. Therefore the prosecution used that to their advantage. I believe the defendant eventually got off, but that ammo issue greatly increased his costs and complicated his defense.