Personally, I would prefer an all lead bullet if you are going that low on powder. I used to shoot the hornady xtp 300 grain bullets out of my ML over 90-100 grains of pyrodex rs. They shot great but I lost the first 3 deer I shot with a muzzleloader. I'm assuming it was because of too little velocity when trying to shoot a jacketed bullet. I wasliterally to the point oftotally givingup muzzleloadingwhen someone suggested the precision rifle www.prbullet.com all lead bullets. I currently shoot only 80 grains of 777 powder and a 220 grain bullet. I bet at 50 yds you could go less, maybe even down to 50 grains. I was amazed at the recoil difference in the 300 grain xtp's and the 220 grain precision rifle dead centers. I am in no way associated with their company but I doknowthat they saved my muzzleloading career. I had always loved muzzleloading but couldn't kill a deer successfully with a muzzleloader.I am so glad someone recommended these bullets to me. Check out their website and if you have any questions, call them. Theyare really nice and have an excellenct product. Let usknow what you decide on. Thanks,Greg