With a lever action, I don't think you will see excess pressure signs, those in the 70,000 PSI range, until you actually reach those pressures. You might not even see them then.
A cartridge in a lever action will not react to 70,000 PSI any different than in a bolt action, although there might be some case and action stretching.
The difference is, the rifle itself might react differently to 70,000 PSI, for example, come apart.
All of this is in addition to the fact that you will never be able to estimate 70,000 PSI, or 50,000 PSI, or anything in between. Or above or below.
Only pressure testing equipment will tell you for sure, and pressure tested loads for lever actions, those loads found in loading manuals, were probably not tested in lever actions, but in guns specially made for pressure testing.
