In times past, there have been several attempts at adding pressure regulators to ramrods in order to ensure a consistent burn of propellant. Perhaps the best-known was the KA-DOOTY of years ago.

The Muzzleloader's Precision Packer is an orange palm-saver, with the bullet seating pressure regulator component built in. It comes in two versions, one is 4-1/2 inches long, designed for loose powder, the other is 3-1/2 inches long and designed for pellets. Here is the manufacturer's statement about their product:

"The Muzzleloader's Precision Packer is an easy to use tool for muzzleloading rifles that turns your ramrod into a calibrated press, seating the bullet on the powder with the same measured force EVERY time, resulting in best possible accuracy. 2 models available. The short version (OAL 3.5 in.) is calibrated for use with the popular Blackpowder substitute Pellets. The long version (OAL 4.5 in.) is optimized for loose powder. Built tough of corrosion resistant materials for field and range use. Minimal moving parts. No adjustments to make. The design and ergonomic shape allow it to serve as a palm-saver during the loading process as well, eliminating the need to carry a separate tool. The Blaze orange color is molded in and perfect for hunters. Complete Easy Use instructions included."

Blackpowder, in particular, has a very fragile grain structure and is sensitive to compaction. The primary use for this, today, is likely for Triple Seven or Pyrodex pellets. Pellets are prone to cracking and when that happens, pressures vary widely as do velocities. The fellow that hammers his rifle / ramrod against a tree is just asking for it and that happens more than some might think.

With firearms of all types, consistency and accuracy are synonyms. With Blackhorn 209 in general inlines and when working with the Savage 10ML-II for smokeless, the exact pressure used to seat the projectile over the powder charge is something I've not found to be important, so long as you use the same seating pressure shot after shot.

With Triple Se7en pellets it is trickier and when using stacks of pellets (three in many inlines, four in the Remington 700 Ultimate Muzzleloader) pellet chipping and cracking can be a serious issue. The 2016 MSRP for the Muzzleloader's Precision Packer is $34.99 + shipping when ordered online.