Being the Range Officer for almost 2 years of silhouette matches at ridgway I get to see more of the goings on on the firing line than most folks do. For the most part folks are wiping between shots. There are a few, very few I see using a blow tube. Most finish up with plenty of time. Occasionally someone will take it down to the last few seconds before they break the shot.
A proper wiping will give you consistent bore conditions, no matter what you do with a blow tube your bore is constantly changing. You get build up in the lead infront of the chamber and things will also build up in the barrel. 
If going hunting, check to see how many shots you can fire before you can not chamber a round. From there you can determine if you want to take a blow tube along with you for the just incase.
Sam

I don’t recall much difference in my squirming either way but the target sure squirmed less when I started wiping! One damp patch pushed on a nylon brush and a quick swipe of the chamber with a bore swab. Always finish well before time runs out.

+1

Blow tubes were often the subject of articles when BP Cartridge shooting became popular.  It's not a good solution for most situations. 

Nuclear Crickets post says it all. Some of the best shooters in the country at his range, very few blow tube.

Boats

I really don't care if you blow, suck, wipe, or pee through the barrel, but if you wipe with individual patches, please clean up your garbage when done.  I have seen firing lines covered with cleaning patches that some one had to clean up. (If peeing through barrel, be discreet!)

if peeing,  be carefull  those barrels can be hot in august        art