Use of magnum primers

[Lemonaid]

I was researching why most everyone was using CCI 450's and if it might be detrimental to accuracy. The primers used by the following companies in their posted reloading data:

Sierra - Win WSR
Nosler - Rem 7 1/2
Accurate (Western Powders) Win WSR
Hodgen - Fed 205M
Alexander Arms - CCI 450
Speer - Fed Gm 205 MAR

Looking at the early posts in the reloading section it looks like there wasn't much of a difference in accuracy from different primers, but I would like to try some Fed GM 205 MAR for myself when my local sportsman warehouse gets some in stock.