Quoted:
I was blissfully unaware of the "variable" nature of the spring I have in my 5in 1911.

What makes it variable, and what are the advantages/disadvantages?

I use standard 230gr practice loads, and have also run well over 500 rds of +p among the nearly 3k problem free rounds down the pipe so far.  Changed springs twice, for good measure.

but what is "variable" about a spring?  Thanks.