20" barrel T3. I'm up to 59gr of Re26 with a 160gr bullet (>2850fps) before I start getting any signs of pressure and 57gr with a 180gr bullet (2750fps).
The 180 especially is a pretty warm load. With a Berger close to or even touching the rifling, I'd want to work up to that very carefully. Probably start down around 53gr.
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