I use one of these:
http://www.midwayusa.com/product/562670/thompson-center-buttstock-u-view-flex-loaderBut I threw away those cheap loaders that it came with and opted for the BH209 ones:
http://www.midsouthshooterssupply.com/item/001650488/Blackhorn_209_Powder_Measure_6_Per_Pack_I have 2 loaded with loose powder and one with 2 projectiles in it. That gives me 1 muzzle shot, 2 back up shots, and 4 primers if needed.