the Epps loads are covered in the P O Ackley books i think. 
i remember the information covered most of Mr Epps designs   hope this helps   dave

John Donnelly in in "Handloaders Manual of Cartridge Conversions" suggests a load of 43.6 gr. of W760 with a 150 gr. bullet.

The 7mm/303 Epps is an "improved" version of the 7X57R and you should be able to use any powder charge recommended for that cartridge as a starting load.

I have been down the road of comparing case size volume with other calibres I have owned over the years where I could not find any load data for that particular cartridge but what I was hoping for was the easy way of somebody who had actually fired this cartridge.  
Looked on line but couldn't find a thing.
Bought a book in Sydney during the seventies with all the variations of the 303. and used to load for my High Walls in 22/303 and a 6mm/303 from it. Now long gone. Didn't think I would ever buy another wildcat 303.
Was trying to downsize but couldn't resist this custom High Wall which came from Canada I was told.

Thanks for your reply.
24 inch barrel and a 1 in 10 twist.
Picked the rifle up yesterday and it came with fired cases.
Cases pretty dirty and before sizing cases I always de-cap the spent primers, unify the flash holes and do the primer pockets with a Sinclair tool to get the same depth and then clean the cases with fine wire wool. As I said these cases pretty dirty and had got through around half when I put them away to have a go at them another day with fine wire wool.
Found your reply and had a rake around in the rubbish bin to find three spent primers to put back into three of the cases I had not cleaned up yet, had just taken the primers out.
I weighted the empty cases and then with the water in which gave me a water weight of 
                  60.8 grains
                  62.      "
                  61.6    " 
Devided by three to get the average weight which comes out at 61.46 grains.
Forgot to mention bullet weight. I have a range from 100 to 170 grains and I generally stick with around the start load which I have generally found to be pretty good accuracy wise without burning out the barrel.
I generally use Australian ADI powder as its good and easy to get and I have charts which show the American equivalent.
Will not be using the rifle for hunting.
Spirit is willing but the legs arn't.