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Re: Ammunition for trapdoors.
Posted by Pete Nelson on Sunday, 19 September 2010, at 7:18 a.m., in response to Re: Ammunition for trapdoors., posted by Al Hearn on Saturday, 18 September 2010, at 10:53 p.m.
Good morning Al,
That is a good question, and I really don't have a good answer since I have always used the Carbine loads in my Carbine (a mid-production Model 1884 with a barrel which I had Bob Hoyt in Fairfield, PA line and re-rifle for me) and the Rifle loads in my Rifle (a very late Model 1888 Round Rod-Bayonet with a pristine bore and deep rifling).
The reasoning behind my using the 59 grains of powder, rather than the usual 55 (and I weigh out each charge individually), was really twofold:
a) One of the more experienced shooters on this Forum suggested it since the additional 4 grains give just enough additional volume that there is a slight amount of compression achieved without using any fillers. Also it was recommended not to use any wads (such as "Walters Wads" 0.030" veggie discs) with the hollow-base M1873 bullets because they tend to become wedged into the void and cause unbalance in flight. I do use a disc of 0.003"-thick Reynold Freezer Paper on top of the powder surface just to help keep it in place during the compression operation and subsequent bullet-seating, assuming that it is probably vaporized upon ignition.
b) The additional 4 grains in some measure help to compensate for the additional bullet weight (420 grains for the Mt. Baldy version of the M1873 versus the 405 grain nominal weight of the actual Frankford Arsenal swaged M1873). The bullet/powder weight ratio for the Mt. Baldy is 7.364 and for the original M1873 is 7.119.
They have always worked quite well for me, but I have never actually tried a .45-70-405 round in my Carbine. I do use a heavy slip-on rubber recoil pad on both the Carbine and the Rifle when shooting off-hand, but usually I shoot both guns in a Caldwell Rifle Double-Rail Cradle sitting on the wooden Benchrest (to save my aging and sometimes-aching shoulder)/
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