Yes, check out the Cabela's conversion kit here
http://www.cabelas.com/cabelas/en/templates/links/link.jsp?id=0012617214038a&type=product&cmCat=SEARCH_all&returnPage=search-results1.jsp&Ntt=knight+209&Ntk=Product_liberal&sort=all&Go.y=0&_D%3AhasJS=+&N=0&_D%3Asort=+&Nty=1&hasJS=true&_DARGS=%2Fcabelas%2Fen%2Fcommon%2Fsearch%2Fsearch-box.jsp.form1&Go.x=0&_dyncharset=ISO-8859-1
#11 cap originally but there are conversions for them to use larger 209 shotshell primers to ignit pellets better.
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.
Among muzzle loaders, caplocks and flintlocks do not use 209 primers.
no, revolvers all use either a No. 10 or 11 percussion cap
Under FEDERAL law, a felon may not possess 209 primers anywhere in the US. They are considered ammunition, where percussion caps are not. Most inline muzzleloaders use 209 shotshell primers.
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.
If this question is asking if 209 shotgun primers can be used to ignite blackpowder, the answer is yes. That presupposes that the firearm is designed to do so. There are some inline rifle muzzleloders that are so designed. If the question is asking if a muzzleloder can be modified to use a 209 primer I don't know if I would even consider doing that unless that gun was of the inline design, even then the cost would probably make it not worth the effort. you would probably have a hard time finding a gunsmith willing to tackle the job.
No.
Never change components when reloading.
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