H335 is absolutely not "extremely temp sensitive" in the 223. Nor is TAC magical, Nor are "insensitive" powders a universal thing.
Denton has shown this a few different times. Some of the testing is up on RSI's website.
Don't "read" Pressure signs in brass. Watch the chronograph. Very carefully calibrated copper crushers are known to report swings on the order of 15-20,000 psi, for the Same reference load when used over @ 45,000 psi. Unknown brass alloy with unknown primer cup alloys being stared at by the average Joe, aren't magically more accurate at it. From Pressure Tracing a few different production rifles, generally, Pressure "signs" in modern rifles manifests itself a bit north of 75,000 psi.
From PT work with the Creedmoor and a few powders, in the operational Pressure listed (min to max loads) each additional 75-100 fps will come at the cost of around 10-15,000 psi. Hodgdon warns on all their bottles of powder a 10% lot variation.
Does the data give tested lots? No, so don't think you have the same thing.
Pressure tested data happens in SAAMI min spec equipment, you have loser tolerances in a production rifle; so more gas bleed-off. When you match/pass book velocity, regardless of powder charge, you have gone over-pressure.
Last edited by Darkker; 09/30/15.
