I've been working with these two molds a couple of weeks now. They are more or less the same bullet, the Ideal being the classic Loverin. The RCBS has been trouble as it had a couple of flaws when I got it. The sprue plate is warped to the point of being unusable despite my efforts to flatten it again. It caused fins on the base. I "borrowed" a sprue plate from one of my other RCBS molds. The alignment pin holes were buggered up and had to be smoothed in order to get the blocks to come together. So now it is casting well. I just have to get in contact with RCBS customer service to get a new sprue plate.
The Ideal 311466 casts effortlessly.
Here are the bullets:
This group is the RCBS bullet cast with the original sprue plate and then trimmed of all the flashing. The load is 12.0 grs. Unique and loaded to a coal of 2.535". I think this needs to be loaded out to 2.595", which is the length of the 311466 load.
Here is the 311466 loaded to 2.595" over 13.0 grs Red Dot. I tried this load at the shorter length also, with poor results.
More info: http://www.castpics.net/subsite2/ByC...%20Bullets.pdf