i use the balistics calculator at
[url] http://biggameinfo.com/index.aspx[/url] first you will need the ball weight and actual diameter and balistic coeficeint.. the bal coef can be calculated at
[url] http://www.uslink.net/~tom1/calcbc/calcbc.htm#calculator[/url] .. put in the cal for 50 that would be .490, then weight about 177, or whatever your shooting,, check cast bullet and check round ball and enter and press calcualte,, this will give a bal coef for the .50 of about .068.... fadaldas shows speed for 80 gr 2f load in one of thier guns at about 1700, i use .8 for sight height, put that in the balistic calculater with temp and eleveation and calculate.. it gave me 494 foot pounds at 75 yards 45 degrees 1000 feet elevation... for the .50 cal......... a .54 with 80 gr ff vel is about 1525 mv taking averages from fadaldas book..(they vary alot) bal coef is aprox .074 with 225 grains and .530 diameter. this gives a foot pounds of 568 for me at 75 yards with 80 grains of 2fg with a vel of aprox 1068fps... .. listen to what the guys are telling you about shot placement giving you the kill,,.. altho the .54 doesnt show a lot more power, it has more over the .50 than what the calculations will show.. you may be able to up your velocity on your .50 to get the extra power your looking for.. and a flatter trajectory.. also i dont just arbitrarily pick a powder load for a gun, u shoot what she likes,, (not your wife :rotf
but what the gun tells you to use.. all of them over 45 cal are disigned to easily kill a deer at its best accuarcy potential.. //////// my .54 like 80 grains fffg. thats what i guess about 1700 fps muzzle vel, and at 75 yards that gives about 663 muzzel engergy .. at 9 1/2 pounds it doesnt kick and it shoots very well.... you can plug all these into beartooths calculator for thornally stopping power .
[url] http://www.beartoothbullets.com/rescources/calculators/php/thornily.htm?v1=225&v3=.530&v2=1068[/url] .. and it will show your power for that load.. it shows your 80 grain ffg in the .54 (.530 ball , 225 grains 1525 fps muzzel, 1068fps at 75 yards) is more than fine for deer at a factor of 74.... thats in modern rifle terms.. the reason it has this power is the bullet weight and caliber of muzzeloaders add up big in shooting live animals.. something modern shooters dont figure in when they look at ftlbs of energy... its alot of fun to look at and figure etc, but again listen to the guys who shoot deer every year with muzzeloaders, that is where you get your facts.. do the figures for the thornally with your .50 at 75 yards,and see what it gives.. good luck dave... :grin: