Thanks Researcher!
Think I will do informal experiment next time I am trap shooting. Will alternate between Remington black promo (67 mm hulls) and Federal (70 mm hulls) 1,0 oz loads. The Remingtons are listed as 1220 fps and the Federals at 1165. Always before, I notice in 70 mm chambered 16 that the Remington loads recoil distinctly more. SO, if the Remingtons still recoil more, I will consider the effect of the 3,0 mm longer Federal case to be negligable. Shoulda thoughta doing of this before!!
This old hammer double weighs about 6 1/4 lbs, so, not many loads with more than 28 grams of shot will be fired in it, maybe none. It does have 75 cm barrels and wonderful triggers, now both at same let off effort.
Niklas
