I just bought one on a 44 1/2. Looks to be a very nice build likely done in the fifties. I will have it in a few days. Have to make cases now. Fortunately I have some 25-20SS cases ordered. Thought about making them from 223 and might make some eventually but right now I chose the easy way. Quickload has the cartridge in there if you use that program.

My rifle is a 1939 vintage Winchester model 70 rechambered from 22 Hornet.  I assume a 1/16" twist. My two favorite loads so far are,
#1 with cast bullet
case -  Jamison
bullet - cast CBE 50gn .224" BHN 18 Lotak lube
primer -  CCI# 450 SRM
powder - 11gn Accurate Powders LT-30
#2 jacketed bullet
case - Shroeder from 223
bullet - 50gn Sierra spt
primer - CCI# 450 srm
powder - 17.3gn H-335
Both loads give outstanding accuracy. 
Another good cast bullet load
case -  Shroeder from 223
bullet - Cramer 45gn .224" BHN-15 Lotak lube
primer - CCI#500 sp
powder - 10gn Hodgdons Lil-gun 
The cast bullet load with the 50gn bullet is outstanding and has shot some consecutive 3 shot groups of under .5" at 100 yards
The rifle is mounted with a vintage 10X German Pecar scope. The rifle was rechambered by J E Gebby the man that copyrighted the name " varminter" for the 22-250 and is signed by him.  It is very tightly chambered so will handle stout loads but I keep pressures low by using powders that have too slow a burn rate to be optimum. For me accuracy trumps velocity and lower pressures also means longer case life. 

That would take a lot of shooting.  More likely they just wanted more speed. I believe that is the case with my rifle too. 
My rifle was most likely done between world wars so brass may have not been quite the issue it is now.  I kind of wish it had not been altered.  It would likely be worth more.
My rifle has been rechambered twice.  Once by Kilbourn I assume to K Hornet and once by Gebby to the 2R Lovell. Both names are on the barrel. I assume both times were to get more speed.

So far I have only used gas checked bullets in this rifle.  The three bullets I have tried all shoot well.  They are a vintage 45gn spt-gc from a Cramer mold, a 50gn gc from a Ranch Dog mold and a 50gn gc from a CBE mold.
Velocities are around 2000 fps.  I use plain base designs only when velocity is under 1500 fps.
I have a Lyman 225462 and the early RCBS 22-55 that were both originally gas check designs but have had the bullet base portion milled down to eliminate the gas check shank. Both now run at about 50 grain depending on the alloy used. Both shoot good at velocities not exceeding 1500 fps.

My pet is also a 22 Hornet but this Lovell rifle has been challenging that position for accuracy with cast bullets.  I shoot only cast bullets in my 22 Hornet.  My hornet is likely unique in that it is built on a model 1898 Krag receiver which is rare but not unique but what is unique is that it has a double set trigger.  Its the only Krag I have ever seen fit with a set trigger.  It has a 1/16" twist barrel so limited to about 50gn for bullet weight but that applies to cast bullets.  Jacketed bullets of equal weight tend to be longer than cast so with jacketed bullets 45 gn is about max. I have quite a selection of 22 caliber bullet molds but of those the most consistently accurate in 14 or 16 inch twist barrels is the 50gn CBE design as sort of Loverin type body with short ogive and small meplate.   That CBE design even with small meplate pushed to 2100 fps from the 22 Hornet is quite destructive on rabbits if I miss a head shot. I once shot a cottontail at about 40 yards that was facing me and about to run so I took the nose on shot and sent cottontail rabbit in all directions with only bits and pieces to recover for the table.  No more of that !