That is not true about the 44 small frame Rugers. Brian Pearce has written extensively on both calibers. His loads run to 25,000psi in 44 Special. I have used one of his 44 Special loads, in my 44 Bisley, of 17.0 gr of 2400 under a 240 JSP and the cases fall out of the cylinder. Normal pressure signs and measurements. I have a large frame 45 Bisley, but I would be very comfortable using his 21,000psi loads in a 45 small frame.