Finding Reloder22 to feed my 6.5X55 Swede has not gone well this past year. I have had good accuracy using WC860 but disliked the unburned granules left in bore and chamber even using Buckshot's "860-flick." Recently I tried a "kicker" load of 3 grains of SR4759 (Lee dipper .3CC) under the full case of WC860 with the 140 grain bullet providing a tiny amount of compression. WoW! No more unburned powder, great accuracy, plus an extra 200 fps over what I was getting without the kicker. Primers show the same low pressure I have come to expect using this very slow powder
With this success under my belt, I tried the same approach with my .40-65 BPCR using 380 grain cast. 3 grains of SR4759 under 42 grains of WC860, card wad and seat bullet on top with light crimp. Great accuracy, clean burn, same POI as 60 grains of Goex FFg without the cleaning of gun and brass. No high pressure signs judging buy the rounded primers. Other than the extra step in the loading process, it appears this will make using my store of WC860 more enjoyable.