Blooming Reticle

I'm interested in creating a reticle with bloom, similar to that in games like Halo:Reach. I've seen other suggest online to simply use an Image and animate it, but the problem there is that this would cause the "stroke" of the reticle to become thicker when it scaled up. I'm looking for a solution where the thickness of the reticle remains constant regardless of size

 

My english might not be the best... so I have to ask if I understand it correctly:
reticle = crosshair?
bloom = bloom shader (blurred with additive overlay effect on top of the actual image)?

not sure why you want to scale the "reticle"... maybe you can split it into several pieces and just move / rotate to achieve your goals?