I had no luck with H1000 in my 98B. Did not try RL-33, but did try RL-19 and RL-25. I now have a 30" tube on it and get 2951fps with 91gr of RL-25. I have seen where a lot of people use RL-33, but I've never had a chance to get any. Also, I don't think I'll mess with what I have...it works!!!!!!