I have been shooting boolits from a Lyman #457132 535 gr. Postell mold in my
45-70. They are sized to .459 and lubed with 50/50 beeswax and alox. They are dropping from the mold weighing from 534 gr to 538 gr. and I sort them into 1 gr. increments for sizing and shooting. So far 34 gr. H4895 seems to give the best accuracy, 1 3/4" to 2" groups at 100 yds.
Thinking I might be able to improve on the groups I tried using some .060vegetable fiber wads with the same load. I placed the wad in the mouth of the case and seated the boolit so the wad is against the base of the boolit with about 1/4" space between it and the powder. Groups at 100 yds. are now horrible at around 5 to 6 ".
Anyone have any thoughts on this.