S&W spur trigger gun .. ammo recommendation?

[OscarNobay]

I've bought this old S&W spur trigger gun. I want to use it very little and use the weakest type of bullet possible so i don't put pressure on it. The gun in question is my profile picture still strugglin to upload.

Above is an attempt to attach maybe that'd work. So please tell me what type bullets i can use.
Also if you can the make and the rough date it'd been produced.

Cheers
Oscar

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