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Those standard cup & core interlocks are a great go to failsafe bullet, used to use them in my 257 Ackley. The VLDs are apparently giving good velocity and performance, they seem to have a small...

760 is a very dense ball powder, usually recommended to run a magnum primer to ensure efficient ignition, though your velocity spread is very minimal so your standard primer seems to be doing the job.

Be keen to hear how you go with the 760 & 130 VLDs. Are you running magnum primers?