I've got acouple both with 1/14 twist barrel and they like V-133 and H-335 with either 50/52 gr bullets. If you can find some surplus 8208 works also about like V-133. I fireform with about 25gr of either powder then go up to 26/26.5 gr again with either powder. For shooting varmits I've had pretty good luck with the rem 50gr HP bullet cheap to buy and shoot. For paper punching I use a custom 52 gr match made by Brawand or Berger. Well good luck