Berrys,West Coasts they are all the Same ---"Plated Bullets" they have Plate tears as are shown in pics posted to tumbling bullets. These I have found are more previlent in a match barrel than your factory barrels due to the sharper rifleing that shaves off the plate. Some times depenting on the barrel,load and weight of the bullet it can be bad or no factor at all. I have barrels that shoot 180's and 220"s just fine but tumble the 200's. I have barrels that shoot them all fine.and I some that don't....If the cost is a factor as it is with me try the diff weights and diff loads and find a combo that works in your barrel and stick with it, or go to jacketed or straight lead.................the plated bullets use a soft lead or swaging lead under them and then strike the plate around it, once the sharp rifling or deeper rifling cuts throught the plate the softer lead underneath cannot hold the rifling as well and slips on it and peels off the plate. Depeneding on how bad it can even cause the bullet to tumble. Ever notice a guy shooting open with plated bullets. bam, bam, bam BOOM AND FLASH, and he can't imagin why, well this is because of the plate tearing off. and the powder and gases are getting in front of the bullet.That is what also tumbles the bullet when this happens and the bullet is leaving the barrel. The crimp can also do the same thing or start the process in the reloading process,however a larger bell on the brass just seems to eleviate the wrinkling of the bullet upon seating. However this is just my observation and I might be all wrong.....IPSC isn't it a great game!!!!!