This has been covered ten thousand times, but even berger hunting bullets are by their own admission, only suitable for larger deer at extended ranges. The jacket is very thin, but so is the hollow point, and at 50-150 yards is likely to do one of two things: either explode like a ballistic tip and leave a runner, or pin-hole without expansion, leaving a runner.
these bullets are designed to shed all their weight at long range, as they penetrate around 18" before they basically explode, leaving a massive wound tract, but often no exit wound (making tracking tough - so don't use by woodland either).
I studied the stuff on the berger site, and they say that even their hunting bullets are for BIG deer and for shots in excess of 350yds. Any normal UK deer are not broad enough to allow such deep penetration before proper expansion begins, except for maybe large reds - AND, to get that expansion at 18" penetration depth, you need a LOOOONG shot to slow the bullet down sufficiently..that's just not UK hunting style.
If you want to shoot big red stags at 400yds on the hill, go for it, but otherwise, throw them in the bin or use them on the range