I think Mr. Brown was referring to making .050" to .062" bushings and pins, rather than the large BP type shotgun firing pins.
The smaller pins are needed for smokeless powders.
If you are running pressures in the low range, below 25,000psi the small pins are not necessary.
I've run my .45/60 (2.60oal) loads with 405gr. jacketed bullets to 1,850fps (35" bl.) with BP pin on my 1868 Sharps, without any trouble. These loads were listed (extrapolated) in Hodgdon's .45/70 data as being around 18,000psi. Due to jacketed bullet, the pressure could have been considerably higher. The load with cast bullets was listed at about 1,600fps from a 24" bl.
Primer appearance after firing was normal/soft pressure.