This will make absolutely no sense to you, because .019 and .010 are sizes...and you would think/assume that when a company says their optics are .010s, that it would be universal...the same size.
This is NOT the case. I thought it was my imagination or an optical illusion at first...until I held two sights in my hands and looked at them both at the same time.
Spot Hogg fibers are larger than they say they are. That's all it can be! What Spot Hogg calls a .010....is what other companies call a .019. Especially in the Montana Black Gold and TruBall Axcel sights...their .019s look identical to the Spot Hogg .010s. I held a Hogg It with .010s and a Axcel Pro with .010s in my hand and looked at them both.
I could barely see the .010s on the Axcel.
Yet the .010s on the Hogg It look to be the same size as my .019s on my Black Gold Vengeance.
As for me...I am going the opposite way. I thought I could shoot better with smaller fibers...but I've found the opposite to be true for me personally.