[Reverend Wright]

maybe

but 455 and 38 webley are obsolete ammo and almost unobtainable

maybe the shooter used 50+ year old ammo. Given the damp in england i am surprised it would work

[marktwain]

I shot 24 rounds of 60+ year old ammo the other day. It had been stored in a jar with a lid in a basement.

It worked as if it had been made yesterday.

This was in Wisconsin.

[Go_Trump_2016]

It seems unlikely that he used a revolver if what this article says is correct:

"Police arrested a 52-year-old former psychiatric patient named locally as Tommy Mair. According to witnesses, Mrs Cox’s killer used either an antique or a home-made gun which he calmly reloaded between shots. As she lay bleeding to death, he repeatedly kicked her before walking away, having stabbed a 77-year-old man who tried to intervene."

http://www.telegraph.co.uk/news/2016/06/16/labour-mp-jo-cox-shot-in-leeds-witnesses-report/

Let's hope it wasn't an antique pistol because otherwise the UK is likely to have yet another round of useless gun control laws which will confiscate some very valuable and historically important antique firearms from private collectors.