JK, so the first rule with muzzle loaders is that the charge is measured and not weighed with a regular smokeless powder scale ? Making sense ? I'm talking about the brass telescopic things with the engraved marks on it.
So for a tip, weigh out several charges from the measure. Determine how many grains it is (weight). This allows for adjusting the charge weights to get them exactly the same, which you can't do when using the measure. But of course the number of grains is vastly different.
Secondly, recoil is very dependant on the bullet weight. I shoot a 245gr slug with my 120gr charge. If you try the same thing with a 300gr slug the recoil (and gas pressure) will be much higher.
Most of us are only shooting deer. They are relatively fragile critters. A 245 gr powerbelt going at 1400 fps at a distance of 125 yds still has a huge amount of energy (~1350 ftlb). My 2 deer so far had different results. The first shot at 130yds was hit just below the spine above the hip. Shot very far back due to moving at a fast walk (group of 20 does). She jumped then fell right over. Bled out internally, bullet severed several arteries. Second was also about 120 yds, standing still, classic double lung.. Bullet never hit anything more than a rib and the lungs passed straight through. Internal wound channel was about 3" seen by bleeding when skinning. That doe managed to run about 200yds. Very little blood until near the end, then like a horror movie.
Anyway, that was my strategy. In my opinion a heavier bullet kicks harder and is more difficult to shoot accurately. If it holds a ton of energy to a soft target like a deer, it is likely to go straight through. A strike in a fleshy area like my first got good expansion and no exit. Its similar to my 8mm mauser, I stated at 200gr bullets and finally went all the way down to 150. If I was up against a bear I may do otherwise...
$8 at Cabelas. I just carry powder and primers in mine, putting bullets in there may work but I have not tried that with loose powder yet. But the charges can be pre-weighed so they match exactly, this helps with accuracy.
I found the ram rod on mine to be virtually useless, so I removed it altogether. I am thinking about one of these
Rossi USA - Telescoping Ram Rod