joe,
At one time at the Visitors Center at Gettysburg, thre was, on display, a Confederate sniper rifle labeled a "Whitmore" supposedly picked up in Devils Den after the battle.
.45 caliber, hexogonal bore(Whitworth) fitted with a brass tube sight , the rifle weighed in at 30 plus pounds.
Interesting piece.
At one time, the Landis Valley Museum had a small but interesting display relating to the early gunmakers of PA.
Zeke