Mark:

RST paper hull - $12
Gamebore "Pure Gold" paper - $11
B&P "High Pheasant" plastic - not sure on price, but similar to above.
Polywad - $8.50

For grouse I like the paper hulled shells, not so much for performance as nostalgia - I like the smell of the fired paper hulls. The B&P I have are just pheasant loads. Someone gave me the Polywads and they seem too light for game.

All should work in old guns, at least I have not had any problems.

Good Luck
Mike