According to De Hass the Peabody was made 1865 to 1872. 
Double D, ok no problem as to being a traditionalist at heart I think most of us here are one. I include my self as well. But having said that I'll have to side with KWK as the round was made in the 1890's. The reason I suggested the Hornady 405 winchester case is that its pretty close to 2.5" as it comes out of the box. From what little I've heard about hornady brass is that its good stuff. And takes boxer primers. And if you want to call my rendition of the origional 375 2.5" a copy feel free to do so. Haven't priced Jamison or Kynoch brass. I'm guessing here that jamison would be boxer capable but what about the kynoch?. They still using that big #172 primer?. Or have they seen the light and gone to boxer primers. Take my ruger #3 action, unscrew the stainless 30 caliber barrel. Take a douglass xx bbl in 375 caliber with 1x14 twist, bbl to be 25-26" long setup with globe target front sight and either a good tang sight like from parts unknown. Or even a nice tight redfield international. And you have something. And just for you Double D, can get target blocks mounted and mount my redfield 3200 in 24x. Its already got #1 wood for the buttstock so would have to scrounge around for a suitable forend like from a ruger varmint rifle. What I like is the sound you get when you insert a large caliber cartridge into the breech of a single shot. That nice thunk sound. No other rifle compares. I'd prefer the target sights as I already have five sets. Two internationals and three olympics and oh yeah, forgot the palma sight that came with my cmp H&R model 12 22rf target rifle.The front globe sight did come with a great assortment of inserts for the globe sight.
Always had problems with tang sights. To get my eye up to the apertature in most cases my chin was almost off the stock.But I have to also realize that Frank at Providence has a business to run and a request one of their rifles be chambered for a clone of a british hunting cartridge that's over a hundred years might not be something he'd be willing to tackle when he's got so many other irons in the fire. And he would probably be right not to undertake such a chambering job for an oddball cartridge when he has a bunch already in his line. But man o' man if this were to come to fruition what a rifle it would be. Excuse my ramblings here, sometimes I get carried away. Still worth some serious thought. As far as the barrel is concerned, very few on the sendero shape  Keep the present .750 muzzle diameter and enlarge the breech section slightly so as to allow a good fiton the ruger#3 breech face, Have the barrel and metalwork matte bead blasted including the lever and the action. With the longer barrel you would have adaquate sight radius. ans have the option of either glass or metallic sights,Should not be too much trouble to find a good smith that worked on the ruger#3 action.Of course the extractor  would have to 
be altered or someone could persuade ruger to turn loose one of thei extractors that they used on the #3 single shot when they were making the carbines and rifles in 405 winchester. Food for thought gentlemen. Frank

DD, read both yous and Frank's post. At this point I grudgeingly have to admit your right. And since Frank has the final say so regarding the strength of his actions/rifles I've hit a dead end. But, the 405 winchester case is about 
2.5380 in length. To get to 2.5" yes I'll have to trim and possibly neck ream.
My reasoning for using the 405 win case is because its available right now and can be used in both the ruger #3 with suitable caliber barrel and same goes for the #1MKIII or the #4 MI orMKII series actions. But since you brought up the fact that if I go to a 270 grain bullet I run out of magazine room. Hence my suggestion of using a ruger #3 action. And since I have on hand a limited supply of speer 235grain 375 bullets would revert to shooting cast bullets. Kynoch brass is an unknown to me. The only time I ever used any was Kynoch 1960 30-06 ammunition. At that time was still berdan primed. Jameison brass I have heard has or had problems regarding sizing of the rims and case heads. Has this situation been corrected?. Maybe my version of the 375 2.5" differs slightly from the British one. So what??. I won't have to depend on foreign sources for brass. Not to insult anyone here by the way. Molds abound in 375 caliber.
PGT can grind a reamer set (rougher and finisher) good 375 blanks or preturned barrels are easy to get. And since the standard length for the 303 british case is about 2.222 or thereabouts I'm only going for the last 1/4" or so to get what I want. Ruger shurely still has 30-40 krag extractors so that should not be a problem. And if thet won't sell any a good smith can rework a 45-70 extractor down to 30-40 krag size. In my mind its doable based on using the ruger #3 action or the enfield actions previously mentioned. In fact due to the lower breech pressure of the 375/405 winchester pressures in a lot of single shot actions would not be a problem. I have a rifle that could be the next 375/405 winchester. Will it be the hottest thing since ice cream NOPE. Just one mans take on a classic british cartridge using basically off the shelf components. Who knows, maybe Frank in his pressure testing and the use of strain guages will allow him to up the safe lever at which these actions/rifles can safely operate. This may or may not happen due to safety concerns. That I understand. His main concern is to provide a product that will be safe, accurate and pleasing to the eye. So far nothing I have seen has led me to believe otherwise. In fact I wish him a very successful venture into what could become a viable alternative to the plethora of sharps, ballards, high walls, rolling blocks and so forth at black powder matches. Imaging showing up at Raton with a side hammer peabody and commencing to knowk down the chickens, turkeys, pigs,rams and buffaloes and doing it with a modern recreation of an 1870 style hammer gun. Well I've rambled on way too long. Hope you gents forgive me and apologize in advaance for taking up your time. Frank

Frank, my hats off to you or anyone who can shoot at 1000yds. The longest that I've shot at was 200yds. I have cataracts and last eye exam was told that they weren't "bad" enough to get operated on yet. Jeeze can't a guy get a break??. Good luck at the matches. 
DoubleD, thanks for setting me straight about the Jamison brass. At least it was good to hear about someone backing up their product. Which is all to sadly lacking in today's world. Good idea about reopening my topic about converting or creating yet another 375 cartridge. If its ok with the Moderators and the folks here would like to do just that. Frank

Singleshotlover, email me at moodyholler@cox.net for a front sight for that 1895 caribiner. I have a new Marbles from way back. Later, moodyholler

The caliber of this kill deer is in 38-55. I orderd one in a 33wcf I need to give up this sport its killing my savings account.But what the hell I can make more money. Tommy Auger

Just ask 38Cal how he breechseats in his BSA 12/15 - he came up with a pretty nifty lay-out with essentially an extension pin on the revceiver which served as fixed point for the breechseater.

I recently received my Peabody "Kill Deer" from Frank at Providence Tool.  I am tickled to death with it.  I opted for the curly maple straight stock with a #3 octagon barrel from Badger.  Lyman #21 sight as made by Providence.  The caliber is one of my favorites, 38-56 WCF.  The action and barrel breech was engraved by Jim Downing, and after the super case hardening job, looks absolutely beautiful.

It was worth every penny and the wait was reasonable as well.

I fired a few shots to initially set the sights, and it does well with my favorite load:  330 gr. Postell 20-1, 52 gr. FFG Wano, plastic wad cut from milk jug, drop tubed and compressed 1/4 " with compression die, Fed 215 primer. Remington cases.  Velocity is 1200 fps, with 3fps deviation.

Great job, Frank, and thanks again for the beautiful rifle.

Bob

peabody photo
This is a 45-70 that is going to a lucky guy.  The  first whatcheer ...Frank I hope the wood on my 25-20 looks this nice Tommy