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I only use 148gr HBWC, 3.0gr Titegroup in my S&W M52, Dan Wesson Model 15VH and in a BSA Martini .310 sporterized with Mannlicher full length forestock and converted to .357Mag
My M52 functions down to 2.5-2.6grs Titegroup, with some bullet keyholing.
2.8 to avoid keyholing and better accuracy with 3.0
Past 3.2 runs the risk of blowing the skirts off the HBWC.