Heres the dallas custom load place but Ive never used them, but heard good things https://dallasreloads.com I have used https://choiceammunition.com With great results And even https://doubletapammo.com Which were great Ive also regularly used ammoseek or just paid extra for premium hunting rounds thru gunbroker. You pay more but they have the good stuff usually. I took my elk in northwest Montana with a 300 win mag with 165gr partitions. 1 round thru both lungs and he ran offa nit and stopped. Second in the shoulder and he dropped. The guide was a friend and said any good round like nosler partition or accubond, sierra gamekings, berger vlds, barnes tsx or most other premium bullets would do the trick. No need for a 338 unless you plan on grizzlies one day. 270 with an at least 150 gr partition type bullet would be the absolute minimum Id rec. With shots around 200-250. The guide recommended minimum .308 in his opinion. Good luck and get in shape. Worst part for me wasnt climbing up,the mountains but hiking down. Tore my knees up. PM if ud like to chat.