from a material science standpoint ill give the breakdown of material difference
usually the blued steel is tool steel or high carbon which is about 250 N/mm^2 and 150 N/mm^2 yeild
for the stainless you did not give a grade so i cant be specific, but it should be able to take 700 N/mm^2 TE, and a yield strength of 450 N/mm^2
for aluminum , Tensile strength much lower than the stainless, as is the yield. but its light and versatile
the only "difference" or noticeable quality that can come into effect with these materials is the heat expansion
aluminum expands quicker , then tool steel, and stainless expands slower than tool steel. but were talking about hundreds of degrees not your average shooting. so as stated by Jimiro blue locktite (or red if your doing hot shoots that could actually bring heat expansion)
another thought would be to lb gauge the tightness to a tolerance. not overly strong , nor overly loose. a good tool would be a small torque wrench