I think the Gent who said Horses for courses was on the money,

But..?

You can set the average Umarexish lookalikes at 6yds so that when you aim at the bottom of a 15mm bull it hits the centre,
move out to 10 yds and shoot straight at the bull for a hit, this is particularly effective for pistol HFT,

This can work for many pistols, all you have to do is remember where a particular pistol shoots at 6 and 10 yds,
even label the cases as such,

PCP's can be way different,

I set my scoped Brocock Grand Prix .177 at 35 yds and 10 yds as I do my rifles, and basically shoot it as a rifle,


This may not work for everyone, but time and patience counts for much,

Just my take on the subject,

Bernard.