The 155 grain PALMA target bullets are marked "PALMA" on the box. If that is what you have, not some other Sierra 155 bullets (Game Kings), they are very accurate when you work up the correct load. As with any bullet, you have to find the powder and charge weight they like.
Sometimes you get what you pay for, sometimes you only pay more for what you get.
Three shots are not a "group"...they are a "few".
If the Bible is the literal, infallible, unerring word of God...where are all those witches I am supposed to kill?