ok i see what you are up to, terminology difference- a head space go no go gauge is a tool used when setting the head space on your rifle more or less you move the barrel in and out till the chamber is in the right spot relative to your bolt. they call them go/ no go gauges because the GO gauge is the min chamber length and the no go is the maximum. example is if the gun can close on a no go gauge its unsafe.
good video on how they work. Setting head space is beyond the scope of this site. but this video is useful if you get a old gun and want to check it. I advise always having a qualified smith check out your gun for head space matters.
Yes the head space gauge is very important! especially on ar15 type rifles. you dont bump it back and she wont close or you get a big bruise from the forward assist. Ask me about a coyote hunt i was on where i fraked it up and i was closed and i hit it hard, still didnt close, could not open the bolt. blah blah!
i use the whidden bump gauge for the same purpose. depending on the rifle i measure a fired case and adjust my resizer to give the desired bump.
The Whidden Gunworks shoulder bump gauge enables you to adjust your sizing die to the desired measurement. The bump gauge is attached to your calipers with a set screw and determines the measurement from the base to the shoulder of the case. We now offer a Thumbscrew Pack that will fit the...
www.whiddengunworks.com
for bolt guns its pretty accepted that .0015 bump is good to go. You can do more or do less and the world will not end. I personally on my precision rigs do .001 to .0005 To test it take the firing pin out so you have no resistance and resize with no bump. you should feel a bit of force to close. now bring it in .0005 and you should feel a bit less. Do this till its in the right spot. The idea is to feel some resistance(slight is the word) but not a LOT. On a hunting gun a bit more bump is prob a good idea since failure to chamber or taking to much time to chamber can cost you your game or your life. THIS IS IMPORTANT when you are done check your fired case aganst your now resized case and make sure you did not bump to far back. More then about .003 and you did something wrong.
on a ar15 you need a LOT more .003 to .005 is a good place to start. You have so much less force to close the bolt that going less will end you up in a failure.
Remember the target game is not the hunting game. You give up very slight things to make sure your gun goes boom.
loaded cartridge gauges are a thing of the past. between the wheeler method and the hornady OAL guage there is no reason on earth not to know where your bullet needs to be seated. Never jam a hunting gun the bullet can pop out and foul your gun up.
case length i just check with my micrometer. My cases get fired a lot and i have a rotation so i keep track of how much they grow.
I am always looking for new ways to make better reloads. In the 1k yard game the more variables you take out the better
i am still trying to shoot a clean round and make HighMaster so i have ways to go