I've been playing with some odd ones.  Lightweights.  123gr Hornady .310 diameter V-Max out of my .310 groove diameter rifle.  130gr Federal bullet, 140gr Nosler HPBT out of my .308 groove diameter barrel.  The square base V-Max worked about the best out of those.  In my .308 groove diameter rifle, accuracy seemed to improve when I jumped up to 168gr Nosler BTHPs.  I recently bought some Russian made steel cased .303 British on the cheap.  173gr FMJBT that's .310 diameter.  Small wonder they wouldn't work very good in Enfields.  I'm going to pull the bullets, size them to .308 for my .308 bore, leave them .310 for the larger bored one, and report the results here.  I think you'd do best experimenting with 168s and up.  I'd like to find an affordable square base match bullet to try out, but nobody makes one.  Nosler has introduced a plastic tipped 220gr BTRN, but those are outta my price range.  Nosler is claiming a BC of .472 for this new bullet.  Grafs has them in stock.

---