Mstake,
Of the two types, there's different schools of thought as to why each works well, but for different reasons.
Jacketed bullets have a jacket that is approx. 40BHN ( Brinnell Hardness), and a core of pure lead that is 5BHN. Nominal sizing is usually .429.
Providing that the nose configuration "profiles" well with your particular forcing cone, it'll usually shoot very well. The harder jacket also enagages, or bites the rifling more positively in comparison to some lead, or cast bullets as well.
All that being said, if attention to detail is paid, cast bullets can shoot equally as good as jacketed, and perform every bit as well.
You can't look at both generically in a comparison. With cast bullets, there's far more variables involved than with jacketed.
As I mentioned, the jacket on jacketed bullets has a 40BHN hardness. With cast bullets, this depends solely on the alloy itself ranging from pure lead at 5BHN, on up to hardness levels into the mid-30's.
Since the whole bullet is made up from the same alloy, not a two part construction like jacketed bullets, it has to be called upon to perform well within the bore, as well as on target.
With cast bullets, alloy, configuration, lube and sizing, play a far more important role in making the bullet work.
Pressure is a cast bullets main enemy, not velocity. Pressures too high for a given alloy will destroy it in short order.
Cast bullets have an elasticity level depending on the alloy used. The harder the alloy, the greater the alloy's ability to "spring back" under pressure. If the pressure is too great for the alloy, it obturates, or expands, and fails to return to an accurate, or useable condition.
I've cast bullets since I was pre-teen for my uncle, but when I started handloading soon afterward, for whatever reason, I used jacketed bullets exclusively for hunting and cast for practice. I continued to use jacketed bullets up until the early 80's when I started to incorporate more and more cast loads for certain types of hunting.
In the late 80's, I switched exclusively to cast bullet loads for hunting and never looked back.
Kind of an educated "leap of faith" I guess.
Looking back now, I made the right decision and saved quite a bit of money.
The use of the right alloy's, the right bullet configuration (i.e., gaschecks, hollowpoints, SWC's, etc.) and the right powders, loads that actually better jacketed bullets can be had easily & cheaply.
Just paying attention to these certain factors can make it so. Pure lead at 5BHN can be used in some cases, up to a maximum velocity of 900-1000 fps. My self imposed limit is usually about 850. Wheel weight's, air cooled at 9BHN, can be pushed up to 1200-1300fps, maybe slightly higher if a gascheck is utilized, protecting the base.
For anything higher (magnum hunting loads) I use water quenched WW's at 14BHN, and a gascheck. Lubes like LBT blue, or Lyman's Orange Magic help a lot, as well as a hollowpoint, or wide meplat style.
I read a lot of Veral Smith's work back years ago, as well as many other cast bullet articles from NRA and the like. I have a small library of it all. I learned a lot and applied it to make things work for me.
Other than the initial expenditure for equipment, it's cheaper overall, and far more rewarding.
It takes a little more work, but that's usually the case when you try and save a few bucks right.....more work, less money.
Sorry so long winded.....
Take care,
Bob