I've hunted with & competed in matches large bore original Jaeger rifles for past 50 years.
All of these original large bore EUROPEAN mfg. Jaegers I've shot have been very comfortable to shoot because they used deeper & faster twist rifling & provide superb long range accuracy with a powder charge in the 70-85 grain ranges.
When I state faster-twist, that often is as fast as one-turn in the length of the barrel.
As most of you shooters know most modern mfg. round-ball rifle barrels feature much shallower button rifling & a slower twist in the rifling than cut-rifled barrels did that were made 100 plus years ago.
Shallower depth fast-twist rifling produces fantastic accuracy with an elongated bullet but
NOTE; Faster twist rifling is not suitable with many modern manufactured muzzle loading barrels because the rifling depth is much shallower. Rifling depth on most of the original big bore 'round-ball rifles I've owned & shot have rifling in excess of .014 deep.
The photo below is my Danish .70 cal. Jaeger that produces ragged one hole groups at 50 yards for me with 82grs of 2f , it only requires a wipe with a damp patch every 3 matches to maintain easy loading & consistent accuracy. Recoil with this load is comparable to a 20-12 ga. shotgun.
Of course none of the above stated big bore accuracy & loading ease would be possible if the bore was not in excellent condition & had not been first precisely measured to determine the 'correct' size ball & what patch thickness was needed to seal the charge.
Most of you seasoned shooters are familiar with the strange looks we get in fabric stores when we walk in with our micrometer & start measuring to get the highest weave density pillow ticking. Then we head home with a few yards to wash the sizing out before using our arch-punch to make a few thousand patches. My Osborn arch punches will punch through 8-10 layers of fabric when using a hard teflon plate for a backing for clean cuts with a heavy hammer.
TIP; For faster & more convenient patches while hunting or at the range, I use a long heavy needle with heavy nylon thread to run through stacks of about 100 pre-cut patches, then leave about 6" of excess thread on one end to secure patches to your hunting bag strap & tie a single or double knot on the bottom end to prevent patches from falling off the string.
Nothing beats a one shot kill or tight group at the range