I have a .223 pistol and a 30-30 pistol that I load myself. The 30-30 is hot and I use spire point bullets for my TC Contender. I also have a 35 Remington barrel but just use store bought ammo so far. I’m not sure if my .44 magnum with 200 gn HP loaded hot reaches rifle velocity in a 14 inch barrel, but the difference can’t be more than a couple hundred feet per second. A 30-30 rifle with a 150 grn goes maybe 2200-2300 ft per second. My M1 Garand using 30-06 is what I would call high power. My M1A at .308 would also qualify. 762x 39 is very close to the 30-30.
What charge do you like? I can't get good groups really, and it burns a lot of powder out the barrel. I just want a .44 barrel I think.