I shoot my own cast in the .460 & .500 most of the time. Question is, what is the point in trying to 'race' to the target? It don't take 2,000 fps to punch holes in paper or kill a deer. (I don't hunt anyway.)
I have had absolutely NO problems shooting cast plain base bullets. Currently have 400 rounds loaded with 250gr Keith SWC & 300gr SWC with 25gr of 2400 and 21.5gr of 4227.
No jacketed bullets currently loaded. Cast bullets are 1/10 monotype/lead or wheel weight.