i have tried RL 15 in my whelen but have had a better experience with Varget. Top load of 55gr yields 2300 fps in my rifle with a 250FXB... 61gr gets 2684fps.... the load I have been using since 1996. because of the substantial freebore, 0.110", i have a rifle /case combination that has an 11% greater effective volume than a minimum standard set up. This is still a stiff load but exhibit no traditional pressure signs, speed is not one because of the increased effective volume
