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I have been using 58 gr of RL-15 for some time in my Rem 700 Classic under a 225 gr Sierra BT. I have not seen any pressure signs.

I wouldn't feel nervous with that load if no signs of excess pressure are noted as you say. I have a 700 Classic in 35Whelen too and that load is easily digested in it. It seems quite a reasonable load. Chronograph a few shots if you want another key indicator of whats going on. You are probably around 2550MV or so(???). As has been noted already on this thread, many are shooting that 58gr. charge (or slightly more) behind heavier 250gr cup and core bullets without issues. In a sound modern gun should be OK if pressure signs don't say otherwise. Just my thoughts but yours matters the most re. your own handloads.

Incidentally a correction, I said above;
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I just joined your 24hourcampfire forum this past week.
Nope - I actually "re-registered" a week or so ago forgetting that I was already a forum member for about 6 months already now. Kinda lost track of that. Just thought some might wonder.