Based on a sample of 5

For PG, bolt action, 30-06 or 375
For DG, invariably 470, Merkel or Heym - never seen anything else except in clients hands as far as DRs go
1 PH uses 458 Lott bolt for DG

Their 470 ammo either federal that clients have left them or very dodgy looking reloads (ie non premium softs with varying lengths of bullet seating)