The above picture are Sam 1 wads from RSI. They look similar to the BPI BP-12 Shotcup that have the friction- reducing ribs on the outside of the wad.
Below is the BPI TPS wad that look just like the Multi Metal wad that BPI no longer makes.
You can't use the old Multi-Metal wad data with the newer TPS wads. The BPI TPS wad creates much more pressure than the Sam 1 wads with the ribs on the outside of the wad.
I am going to send in some more 1 oz TSS loads to be tested with a BPGS gas seal wad under a TPS wad. It looks like I will get about the same speed and pressures with about 8 to 9 grains less Steel powder by using the BPI wads over the Sam 1 wad.
I am also going to send in some 3" Fiocchi 1-1/2 oz loads of Hevi-Shot that I got the data from BPI. I want to see how the pressures and speeds look compared to the BPI Hevi-Shot reloading manual.
Both of my test loads that were way over pressure had the BPI Mica Wad Slick on the TPS wads.
