It is a roll of the dice. Too short and rounds will not chamber (click and no bang). Too long and your looking at another mess of problems (big bada boom).
Odds are your headspace will be ok. But if you want peace of mind then have your local gunsmith check it. Or order the gauges yourself and check it. They run for about $60, one go gauge and one no-go gauge.
My first build I didn't check it and just handloaded a light round and checked the fireformed case. But now I am looking to build more rifles not just for me, so I bought the gauges.
Good luck and be safe