Spencer reloading question

[LaughingTerror]

Hi all. I am rarely new to BP reloading. Been doing a sharps 45/70 for about 2 years. I have an original 1865 Spencer carbine with a centerfire conversion in it I inherited from my father. His reloading data shows 2 different loads he used. Either 35 or 39 grains of goex ff. When I loaded a case with 35 grains using a 30 inch drop tube it fills the case to the top. I have seen a few videos that show guys loading 42 grains and the case filling up that much. It just seems a little full to me and when I seat the bullet it will be a fair amount of compression. Anybody else reload for an original carbine let me know if this is normal?  If I measure how deep the bullet sets and fill it to that mark it comes to 19.5 grains with no compression.

Thank you for any help

Robert

[Hair Trigger Jim]

Are you measuring grains by weight or grains by volume?

[LaughingTerror]

Weight

[barkerwc4362]

Compression is a fact of life in reloading with black.  I don't reload for an original Spencer, but do for one of the replicas in 56-50.  In Starline brass I can load as much as 40 grains, but it is compressed with a Montana Precision compression die, after a wad is placed over the powder before I seat the bullet.  I adjust the compression die so the bullet is in contact with the wad and does no compression when seated.  This is the same basic method I use for loading 40-65 and 50-70 with black.  Original loads used some compression.  The amount of compression can vary based upon powder brand and granulation.