I don't know who 400 Nitro Express is, but his post: What a joke. Damage to DR barrels has nothing to do with pressure, and everybody knows that. I've discussed their "tests" with Ty on the phone. I tried, but I couldn't keep myself from laughing."

When I read this from the link above, I laughed. Obviously 400 NitroEx. knows nothing about pressure relating to strain gauges, but sure likes to spout off. Perhaps he's being funded by 'other' bullet companies?
Strain gauges show exactly what the barrel is feeling. To have this OSR phenominum, to actually press the rifling out to the outside of the barrel takes pressure - a strain gauge is on the outside of the barrel and shows the strain, pressure THERE.

Interesting.hahahahahahaha!