High Desert Hunter
AH veteran
- Joined
- Jan 25, 2014
- Messages
- 141
- Reaction score
- 73
Looking forward to doing some load development with it. Planning on using somewhere between a 370 to 420 grain bullet at 1000 to 1200 fps.
Is your BFR the 475 Linebaugh/480 Ruger version? Or just a 480 Ruger? I will get this one to shoot, even if it ends up costing me a bit more money, I have long wanted a 475, and at times kick myself for not getting my Freedom Arms in 475 instead of the 454, but at the time I wasn't really looking to invest in new molds and dies and cases, I still had all of the stuff from when I owned a 454 several years back, live and learn, this one may be my chance to let JRH or Gary Reeder put a small stamp on one of my pistols, I do know that in the next few years, God willing I will be putting a small reddot on it to help my aging eyes.Sounds like you are well on top of it then. In my BFR the chambers wont tolerate a bullet larger than .475 dia else they wont fit in the chambers because a larger bullet puches out the case sides. I had bought some bullets from Cast Performance and the box said .475 but they actually measured nearly .477 and no way would they chamber. I called them up and asked if they could make bullets that measured what the box said and they said no, most folks want .476 or so regardless what the box said! So I found Rimrock bullets in MT and they make a .475 bullet that fits perfect. Jacketed are no problem of course. BFR said "we cut our chambers for factory ammo".
While the jkt bullet is lighter, the cast bullet usually runs at a little less pressure so you can often use a little more powder. MP 300 is said to be like W296 but I think it may be a tad slower if anything. I would start a little lower, whatever the manual says if it does, then work up for accuracy keeping an eye on anything that looks suspicious. You cant really use the old rifle pressure indicators like primers because of the lower pressures involved, so it pays to be cautious. If you start getting craters or real flat primers, you are probably on the
The maximum load for a 400 grain jacketed bullet is 24.2 grains. So I was thinking about starting at 23 grains with a 425 grain cast bulletand keeping an eye on things from there.