If I remember correctly, go to
www.danwessonarms.com (or something very like it, may need to do a search) they have lots of data as it is a propriety chambering of theirs. It was originally created using highly modified 444 cases, but that is no longer nessicary, new brass can be purchased, Starline is the maker and it is simply a lengthend 44 mag case. It is somewhat expensive, $30.00 for 50 cases, but if they are of the same quality as the Starline 44 Mag cases I am curently using, reduced loaded cases would last practically forever. I have been shooting the same 44 cases for the last year, certainly at reduced pressures, but I have not yet lost any due to any kinds of cracks, and have loaded them at least 30 times.
Also go to
www.accuratearms.com they have the 445 SM though the data is developed in 10" barrels. Note that the 445 does in a 10" barrel what the 44 Mag does in a rifle length barrel, and the 445's usefullness in a rifle barrel becomes very apparent.
Yes, one could use reduced loads in a 444 and get the same velocity performance, and I do think the 444 is somewhat superior to the 45-70 with 300 grain bullets. All else being equal, the smaller diameter bullet should give better penetration and fly a little better than its larger diameter cousin.
Personally, I wouldn't have a 444 over a 45-70, the latter is much better suited to the use of heavir bullets, and if an elk cartridge is what you seek, I think the heavier bullet you use the better. However, I am no Layne Simpson, and in the most recent edition of Shooting Times he does a great discourse on the 444 and ends with his taking of a 400 pound caribou at some 265 yards using a 250 grain Nosler Partition. In your location and hunting opportunities the 444 could serve you well indeed. If you can't find this copy, let me know, I will be glad to photo copy the article and send it to you.
Edit:case length is the same as the the 357 Maximum, 1.6". Firures, both are the work of Elgin Gates.