These +P 45 Auto Rim loads use high quality Starline brass with flash-suppressed powder to shoot in the dark without blinding yourself. Both of these loads are the equivalent of +P+ 45 ACP ammo, also known as 45 Super. These are very stout loads, but will not harm modern 45 ACP revolvers, nor will these loads harm any post-war 45 ACP revolvers. Feel free to safely shoot these loads in any post war 45 ACP revolver in normal good operating condition.