The Gentle Readers might want to run some id the references and authors down as discussed in this article:
https://thegca.org/wp-content/uploads/2020/10/Ammo-Part-3-article.pdf
Great post. The explanation of why high port pressures occur with slow powders is key. Jim Adell's observation on pg. 26 is the risk you take when you shoot slow powders and heavy bullets through a Garand.
I've been able to survive loading within the accepted range of powders and bullets quite comfortably. If I had to shoot factory 30-06 hunting ammo I'd get an adjustable gas plug to be safe.