Yes, I'm left handed using a Right handed rifle, I'm that used to using a R/H action, I find I just can't get used to a L/H action, have tried, but ended up selling them.
I'm mainly a comp shooter in the BGRC, but this one has seen a bit of hunting over here, nothing big though, just a few pigs etc. I mainly use the lighter bullets, 350 and 400 mostly, 500's are a little difficult to buy here, and expensive. Also I don't really have a need for a 500 grn, when a 400 Woodleigh will do whatever I shoot at.
I too have a 500 J on an Enfield, I like them because they are a good starter action that is long enough for most cartridges I would plan to use one for.

Thanks for everyones replies so far.

David.