Originally Posted by highridge1
So with this +P design have you tried RL33 ? On the +P how much added freebore is there? Is this a combination of specific powders and the +P design to get these crazy velocities?? Wildcats have been around along time just trying to figure out where this additional 200 fps is coming from? Could it be done with RL25? These numbers you are getting are very fast!!
Not usually a RL fan so I will let others test that for now.
No freebore at all, these loads are -.030" off the lands.
I do believe the 570 powder is a good choice for top velocity from this case volume and barrel length. But the ability of the +P removing the early spike in pressure is what allows you to increase the charge.
I think RL25 would be too fast for this chambering and I want something less temperature sensitive for a long range rifle so you won't find me loading powder that have RL in the name often.
There is a reason Shawn got a patent on the +P chamber. It is nothing we have seen before, at least I haven't.