Re: Reloader 33
Tucson hasn't heard of RL-33 either. I got my 8 lbs from Powder Valley months ago. Turns out even with hazmat fee the powder cost less than if purchased at local Sportsman's warehouse.
As for the useage of this very slow powder, I have determined that it works well in a few varied cartridges. It would appear to perform in a similar manner to RL-17's longer burning curve and subsequent higher velocities. It is slower than retumbo. A mid to high suggested charge for Retumbo is a good starting point for RL-33 if no data is available. I tried RL-33 with four cartridges to date:
It made a huge difference with my 28" barreled 6mm-284 with 105 berger hybrids. Max load with Retumbo was 3307 fps, RL-33 yielded a 178 fps increase for a velocity of 3485 fps.
As an experiment to shoot the 230 gr target hybrid I rechambered a 24" 300 Win Mag to 300 RUM. Using RL-33 maxed out at 102 grs with slight bolt lift resistance. Backed down to 100 gr for vel of 2975 fps. Imagine what a 26" or longer barrel could do.
A 28" 3 groove 257 weatherby with moly coated 110 accubond gained 91 fps over a max load of RL-25.
Also tried RL-33 in a 24" 7 Rem Mag comparing it to its original load with retumbo and 162 A-max. Couldn't gain any velocity performance over retumbo.
If there is a trend I noticed, which is supported in the limited load data Alliant has published, RL-33 seems to work best with heavy for caliber bullets.