volume
About volume measurements for Pyrodex and BP.
I did not see this addressed at all....the OP wrote
So then 40gr for both powders are correct then? I'm just a little confused because of conflicting information in books and online sources.
I can see why he is (or was )confused.
The measure is set for 40 grains (or 50 or 90, whatever). Ideally, if one fills the measure with BP and weighs it, the powder charge of BP will weigh 40 grains (or 50 or 90 whatever).
If the OP takes that powder measure at 40 grains and puts Pyrodex in it and then weighs the Pyrodex....It will weigh less than 40 grains. Noticeably less.
A 4.3 CC Lee dipper will drop 68 grains of FFFg BP +/-. Use it with Pyrodex P and it will give you a charge in the low 50's (nominally 52 grs.).
Pyrodex is bulkier than BP as well as more powerful.
A 2.5 CC Lee dipper throws just about 40 grs. of FFFg; it throws 30 grs of Pyrodex.
About that compression business. Yes...their loading notes are specific to cartridges. The instructions are more detailed than "light compression" and specifically state "Loading density should be 100% with light compression not to exceed .100"."
Anyone who is unsure about what "firmly" means regarding loading a muzzleloader shouldn't be shooting one.
Pete