Had a few minutes at the bench and chrono this morning. Worked the big 250 Speer up to 2100 fps with LVR powder with no typical Contender pressure signs (rimfire pin marks, excessive case head expansion). It appears I have more room to go further, but how much I can’t say. Doing this seems safe in my gun but yours may be different!
I’m out of the handful Speers I had, and they’re now unavailable, but I might work next with my 220 cast bullets - I have the mold so I can’t run out of them! Hoping to get my hands on a 250 gr mold soon as well.