I love 300-MP in .357 R92 but I was told that Leverevolution was faster than. I could have miss understood what the reloader(does the reloading for the range) at my local indoor range said though.
300-MP is great but it's hard to find decent load data for it.
I don't know who told you that but I use Leverevolution in my 30-30 ammo and played around with a few other rifle cartridges with it too. That powder isn't even a fast rifle powder let alone faster than a magnum pistol powder.
Don't take anyone's word on it, go directly to the distributor and look at the
"Burn Rate Chart" for yourself. Even though 300-MP isn't yet on the chart we all know it's in the same range as W296, Lil'Gun and 4227 which are all in the high 50's and low 60's on the chart. They list Leverevolution as #104 similar to BL-(C)2, W748 and H380. There can be no comparison, LVR is a fairly slow RIFLE powder, not a fairly slow PISTOL powder. The differences are like night and day.
If you want to verify the relative burn speed of 300-MP take a look at the chart on the Ramshot Site. They list it right next to W296 & H110.
*EDIT*
I just checked the new Hornady 9th edition manual and on page 38 they supply us with a current burn rate chart.
They list Power Pro 300-MP @ #54
They list Hodgdon Leverevolution @ #103
Remember, even powders which are right next to each other on a burn rate chart doesn't necessarily make them close in burn rate. It just makes that powder the next fastest or next slowest in line. According to Hornady's chart LVR is slower than Benchmark, H322, 4895, 4064, RL-15, Varget, IMR4320, BL-(C)2 and then 6 more down comes LVR.