My Savage barrel swap was to a 22-243 AI. No proper head space gauges available.
I placed a freshly necked down 243 case into the chamber and placed one thickness of carbon paper from a credit card machine behind the cartridge, in front of the bolt. Screwed the barrel up to contact the cartridge and tightened the barrel nut.
When done, the bolt closed freely on the brass, but would not close with two thicknesses of carbon paper. Though I do not know where you will find an old fashioned credit card machine these days.
It was headspaced perfectly for my ammunition.
If one is working with other than a wildcat, same procedure with a factory cartridge. (Pull the bullet, and dump the powder first)
Or buy a go-no go set of head space gauges from Midway. It appears a set for the 284 will run about $100. If you get there before they are gone.
