The BERGER 180 HYB TGT, 184 LRHT or 190 LRHT bullets would be good choices here with you 1-8 twist barrel. So as Sandstorm says. You need to test to see which one works best for you. If recoil is a factor in your choice. The 180 and 184 grain bullets may be your best choice. If you need load data help. Please contact us at Support@capstonepg.com8 twist barrel 280 AI. Reading all I can ....... what bullet for 1K do you use of these two mentioned ? thankyou