You should be getting close. If mine delivers by 2/24/25 that's 190 days or 6.5 months. 40 days over the 150 days but still faster than a Manners order.
I've been hunting with a Steyr Pro Hunter 7RM since 2007. I also have Steyr PH II in 7-08 and 223. The PH III is just the newest rendition. Steyr makes a fine rifle
I love Steyr rifles. Unfortunately they are slow to adopt new modern cartridges like the PRC lineup.
https://steyr-arms.us/firearms/hunting-rifles/pro-hunter-iii/
Most custom 6.5prc/7prc/300prc chambers are the AW2 reamer which makes the .200 line larger to aid in not getting clickers.
I know you don't want to admit it since you spent all this money on a custom gun but it could simply be that this barrel is only capable of that size group. Shoot a 20...
Depending on the unit I might still opt for the 4 day season with two scouting days. Your scouting days might put you on them opening morning and tagged out.