Sizing RCBS .357cal 158gr Cowboy Bullet

[detox]

I am using 20/1 lead tin ratio and these bullets are falling from mold @.361". Do I need to size these down to shoot in my S&W 686. Forcing cones measure exactly .357" using (measured with pin gauge). The soft 20/1 .361 bullet fired thru a smaller .357" focing cone seems like it may be too tight of a fit? How small should I resize if at all ?

Are there any other tricks to firing this bullet in my S&W 686 revolver such as powder, primer, lube, fiber wads?

Thanks

[bobthenailer]

Ck the size of your CYLINDER THROATS and size at or .001 over that size and all will be well ! ive owned several 686 Smiths and all worked well with bullets sized @.358 dia
NO tricks ! 357 mag case with 4.0 to 4.5 gr of Tightgroup or Bullseye powder should work well for about 800/850 fps. & excellent accuracy.

[detox]

OK thanks. The CYLINDER THROATS measure .357" so I will resize to .358"