I have chrono'd the rifle and the results are as follows:
I used FTT straight from the tin taking 14.7 grains as the weight.
594 (11.5)
600 (11.8)
588 (11.3)
585 (11.2)
601 (11.8)

I think this shows reasonable consistency for a rifle that has had very little use and certainly has been idle for years!