I need partners...

[Guns Garrett]

Either carriage should be adequate for the Martini or the Snyder...

[RattlesnakeJack]

Rattlesnakejack
Just wondering if the "EMPIRE" would have bought U.S.  Parrot rifles for their artillery back in the day?
The Brits had plenty of their own design.

No ... as you say, Britain had plenty of their own patterns (many of which were imported by the USA and CSA during the "Unpleasantness").  Canadian field artillery of the era my group portray (1885) mostly used the British 9 Pounder RML (Rifled Muzzle-Loading) gun and, to a lesser extent, 7 Pounder RML.  We got a 3/4 scale reproduction Parrott Rifle barrel for our full-size carriage because it was the closest facsimile we could get to the appearance of a 9pdr barrel - it is shorter than a 9pdr barrel, whereas a full-scale one would have been longer.  The weight differential was the deciding factor for us, rather than price - in fact, we had already ordered a full-scale barrel but then we had second thoughts about ease of loading, unloading and field movement of the gun, and changed our order.  (Our barrel came from Hern Iron Works in Coeur d'Alene, Idaho.)

Here is a Canadian 9pdr RML gun detachment on service in during the 1885 North-West Rebellion -



And we have access to the "right up to date" Canadian Field Artillery manual -

[RattlesnakeJack]

Mine the first model prairie carriage

You'll need a limber and team of horses then, General!



We have actually demonstrated a few times with horses ... although not too much, since hauling them, and hooking up and all that is  not practical at most venues ... and too much of a hassle, really ...  IIRC we have only done it with our "small" gun (a half-scale representation of a 9pdr) but not since we completed the large gun, so I don't have any photos of the full-size gun hooked up with the limber and horses. 

This was at Fort Walsh National Historic Site -



And these were tkenat the Calgary Stampede a few years ago -

[Guns Garrett]

Anybody need scale drawings for a 12pdr. Whitworth?

[River City John]

Remind me to throw it in the car and I will bring a lb. of black to donate.

RCJ

[RattlesnakeJack]

Remind me to throw it in the car and I will bring a lb. of black to donate.

Throw what in, John?

[River City John]

I sorry, me English no good.

Reminder to bring a pound of black powder before I leave for The Muster as a donation to Jerry's howitzer project.




RCJ

[Grapeshot]

You know anyone with a LARGE Lathe that can bore that out to the proper size for a 12 pounder?

[Major 2]

That would destroy it,  those tubes are ornamental sand casted iron with 2.5 " about 3/8 wall steel liner & welded breach.

[Guns Garrett]

You know anyone with a LARGE Lathe that can bore that out to the proper size for a 12 pounder?

A regular 12pounder field gun (1841 howitzer) had a cylindrical bore of 4 5/8". 

A 12-pdr Whitworth only had a bore of 2.75", but the bolt was 9.75" in length.  The trick is getting the bore hexagonal in shape, not cylindrical.

[Guns Garrett]

I participated in a CW reenactment years ago at Ft Steilacoom, WA (near Seattle) where a member had made a 3/4-scale Whitworth, using 1 1/2" high-pressure gas pipe.  Its O.D. was 6" with 2 1/4" thick walls.  He also had heat-shrunk a reinforcing ring around the breech area, that also had the breechblock hinge forged into it.  (The owner/builder was also the owner of a small metal-fabricating shop, which included a small casting facility, and machine shop)  The barrel was about 6 ft long, and tapered to about 4" at the muzzle.  The hardest part was making the breach, having a triple-leade threaded breech cap that sealed the breach in one rotation.  The owner would ONLY shoot blanks, no projectiles at all, not even golf balls.  The cartridge looked like a salami wrapped in foil.  (with corresponding humor, the Gun Captain would occasionally substitute the command "Load Cartridge" with "Slip me your salami...")

I big regret is never taking any pictures of it...