As much negativity as we dish out concerning the Lee Cruise Missile its not all bad. The Cruise Missile is capable of decent accuracy at 50 yds in the 1,500 fps range. Below are two targets, one shot with the 140 gr Lyman and the other with the Lee Cruise Missile. They appear to be almost a mirror image of each other. Same shooter, same rifle only a few minutes apart. If you want to experiment this is the place you start.
Gardner still lists the Cruise Missile and you can get 250 pcs for $30 plus shipping. He has limits so you need to read the terms. I bought 500 years ago and I'll probably never finish them all off but I'll try.
Gardner's mold is one of the single cavity from the first batch made. The Midsouth 2 cav molds are useless for 6.5x55, IMO. If you ask Gardner he may sell you un-ized and un-lubed Cruise Missile so you could size larger to experiment with various 6.5mm rifles. I've done business with Gardner for over 20 years and have purchased many cast bullets from him as well I've met him in person at Valparaiso, Indiana gunshows.
http://gardnerscache.com/6_5mm_170_fp_g_c.html
6.5x55 140 gr Loverin Lyman 266469 .266" 10.5 grs Unique
6.5x55 170 gr Lee Cruise Missile .267" 13.8grs 2400