Cheers gents
Pauln - I did stumble upon that forum after posting, thanks - tis very informative
Scooby - It appears that they are both adjustable, but I think the crux is that the LP50 has to have more sear engagement so isn't as crisp.. Either would have to be 500g anyway for comp.
CRX - thanks for your input - how crisp do you find the trigger release?
I've had a go with an LP5 in the past but it was wrong handed so I didn't get a good feel for the trigger. Do you compete with yours or is it just a pricey plinker?