I have got some of these to try 25caliber 115gr, and 264caliber 140gr. I will be using them in my 25/06, 6.5x55, and 264 winchester magnum. I am wondering how the work as far as penetration and accuracy. If they willnot hold up good I will just target shoot with them. The are the new core lokt ultra bonded is what is says on the box. Thanks for any info