Went to the range yesterday with my 10" 44 mag Contender. Working on a deer hunting load. I had some 429421 bullets ready to load. Group #1 were sized .431 in a lubrisizer and lubed with Felix World Famous Lube and loaded with 10 grains of Unique. Group #2 were also sized and lubed with FWFL, but they were loaded with 8.5 grains of Unique. Group #3 were tumble lubed with Lee liquid alox and sized to .431 in a push die and loaded with 10 grains of Unique. I only had those five rounds loaded up and wish I had more.
That groove on the 429421 holds a lot of lube. I wonder if that had the effect of opening up the groups because the LLA bullets only had a light coating of lube. These groups were shot at 50 yards, iron sights, off sandbags.