Yes ... I see nothing wrong with the old leather seals and it somehow feels wrong to replace an original leather seal in a vintage gun with a modern plastic seal. But I have known leather seals to fail with age; but they are easy to make and replace, which all adds to the enjoyment. However, a quirk I am very aware of is that an old leather seal that falls apart on stripping the rifle and thus needs to be replaced can often be doing a very good job before the strip.
Cheers, Phil