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| My Rolling Block along with loose cartridges, packages of ammunition, and a period-correct tool. |
I was fortunate enough recently to acquire a New York State Militia Remington Rolling Block rifle in .50-70 Government, so I took it to the range today to do a preliminary workup.
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| Original .50-70-450 Government cartridge. Note the Bénet-primed case. |
The original cartridges had a .50-caliber bullet weighing 450 grains over 70 grains of rifle powder in a copper Bénet-primed case. (These look like rim fires, but are not.) Unfortunately, the modern Starline brass I acquired will not take 70 grains of powder without the use of a powder compression die, and there are currently none available (although I am having one made at this time). I therefore loaded my cartridges with only 60 grains, and even with that reduced load the bullet noses were somewhat squashed when I loaded them. I made two batches of cartridges, one using Swiss 1.5F and one using Swiss 2F. The bullets I used come from a Lee mold which produces a nearly perfect match for the originals in size, shape, and weight.
The original 1871 Springfield Rolling Block made for the U.S. Army (which is slightly different in design from those bought by the New York State Militia, although they used the same ammunition) had a muzzle velocity recorded by the U.S. Ordnance Department as 1,240 f.p.s. (1873 Ord. Dept. Report pp. 392-393.).
I shot two tables of fire today. Table of Fire One was fired using cartridges with 60 grains of Swiss 1.5F powder, and Table of Fire Two was fired using cartridges that were identical except for being loaded with 60 grains of Swiss 2F powder.
Shooting Conditions: Heavily overcast, 66 degrees, wind from 11:00 at 20+ m.p.h., humidity 29.97inHg.
All shots were done from a rest at 100 yards. The Point of Aim was at the very top of the center block on the target (i.e., a 12:00 hold) with a full sight. I elected to use a 12:00 hold and a full sight when I discovered in preliminary firing that the shots were hitting extremely low, but even that extreme combination was insufficient, as the pictures below will make plain.
Table of Fire One: 60 grains Swiss 1.5F.
Muzzle Velocity: 1,268 f.p.s.
String Test: 5.5 in./rd.
Figure of Merit: 3.73 in.
| ToF One, 60 gr. Swiss 1.5F. |
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| Figure of Merit Grouping Diagram, ToF One. |
Table of Fire Two: 60 grains Swiss 2F.
Muzzle Velocity: 1,286 f.p.s.
String Test: 5.2 in./rd.
Figure of Merit: 2.72 in.
| ToF Two, 60 gr. Swiss 2F. |
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| Figure of Merit Grouping Diagram, ToF Two. |
Conclusions
My goal, as always, was to make ammunition which functioned just as the original did, and I have obviously not succeeded here. Not only did both batches have higher muzzle velocities than the Ordnance Department records, despite using light 60-grain loads, but even with these higher MVs the rifle did not shoot to the sights. If my ammunition matched the original ammo, at 100 yards the Mean Point of Impact should have been on the bullseye (see the Figure of Merit Diagrams above), but in both cases the Mean Point of Impact was well below the Intended Mean Point of impact (about 5 and 7 inches respectively). Since the Muzzle Velocities for both batches were higher than the original, the Mean Points of Impact for both tables of fire should have been higher than that, but, instead, they were still lower.
These results leave me with a complex problem: Was the MV the same for the NY Militia Rolling Blocks as for the Springfield government Rolling Blocks? Why were the muzzle velocities higher than the original ammo despite being lighter loads? And why were the Mean Points of Impact so low despite the MVS being higher than the originals? As to the MV, my suspicion is that the volume of the copper Bénet-primed cases were significantly different from (i.e., larger) my Starline brass, so even with only 60 grains the heavy compression in my cartridges drove up the MV. Again, however, this does not explain the ridiculously low Mean Points of Impact.
As to function, and setting aside ballistics for the moment, the Remington Rolling Block is a superb rifle. Loading was easy, the rifle is comfortable to shoot, and the trigger is excellent. The rifle does not eject as well as a Springfield Trapdoor, and obviously has a much more curved trajectory than the .45-70 rifle but that is to be expected. I will say, however, that contrary to people's claims, I didn't find the manual of arms to really be any better than that of the Trapdoor.



