Originally Posted by MMERSS
I loaded up a few rounds of RL-33 for pressure tests.
99gr of RL-33 is showing same velocity as 94gr Retumbo with the 300 SMK in my Lapua. There is some velocity increase with the RL-33 over Retumvo with the Bergers.
This makes me wonder if the improved cases are taking more advantage of the RL-33.
With your Lapua, are you pressuring out or are you running out of case capacity at these powder charge levels?
Depending on your throat length, may just be a capacity issue where you can not take advantage of the slower powder simply because of lack of room. What you see with the 99.0 gr of RL33 vs 94.0 gr Retumbo with the SMK at the same velocity is about what I am seeing as well with that amount of spread for same velocity. Only that with Retumbo, I am pressured out and with RL33 still have a lot of room to increase.
I am surpised your getting 94.0 gr of Retumbo in your Lapua with comfortable pressures. Seems a little high with the 300 gr SMK, with the Berger that would be on the top side of what I generally use but with the SMK and its longer baring surface, it tends to pressure out a bit sooner with Retumbo.
Just curious what your load density is at 99.0 gr of RL33?