No.
Never change components when reloading.
RUM stand for Regular Use Medicine, usually its called XXX RUM, that means XXX stands 30 in roman numeric so XXX RUM means 30 days Regular Use Medicine
Rifle primers are usually made of harder metal, and may not fire from the lighter strike of a handgun firing pin. More importantly, the height of a rifle primer is usually greater than a pistol primer- you may end up with a "high" primer that can bind the action, OR cause a premature firing. In general, not a good idea. There has been a primer shortage due to panic buying, but the shelves are getting restocked. You should see pistol primers again pretty soon. you would need the large pistol primers.............
Federal 209A primers are hotter than Federal 209 primers and are hotter than Winchester or Remmington or CCI 209 primers. To duplicate your load when substituting Federal 209A primers in place of any other 209 primer, use 1 grain less powder for like performance.
You cannot re-size 380 brass with a 9mm sizing die, nor can you size 9mm brass with a 380 die. You can use the the bullet seating dies back and forth. But you'll need to get sizing dies in both 380 and 9mm. The shell holder and primers are the same for both.
No
Never change components unless a proven manufacturer who publishes reloading data has tested it.
We use this principe when the annealing temperature of the two primers (reverse and forward) is different
Depends on the laws in that state, and the type of muzzle loader. Under Federal law they cannot use a gun with 209 primers (shotgun primers) as the primers are considered ammunition. In some- but NOT all states, they can hunt with a caplock or flintlock.
not really, rum has a distinct taste.
rum bourban or brandy