East Pakistan in the 60s would have been fun to see how it was,with all the fine events and the visiting people who came there. Deer s, boar, Bear, Gaur, Leopard and Royal Bengal Tiger, aswell as Wildfowl of many kind and other small game. Some good fishing also, being on a yacht in the rivers to evade those huge striped fishing cats . 3 or 4 weeks would be many fine experences that few other destinarion could top .
The 12 bore 3 inch shotgun, a Paradox would solve many issues.
Or drilling 12 bore and 7x65R
The big rifle, a Mauser or a modified M70 in .458 .
With modified, i would have contacted stockmaker Bredvold to look into bedding and reinforce the stock.
Or if i had seen an ad for a American firm called McMillan,i would sendt them an order.
I think then medium rifle would be a M70 in .338 Win, thick barrel, ART scope and McM stock on both of them.