For those looking in, I've copied over a briefing on the Lovell that I have posted on other sites.
The "22-3000" (or 22 Lovell) was a wildcat round developed by an American named Hervey (not Harvey) Lovell, about 1934. He accomplished this by taking the "25-20 Single Shot" case which is a bit longer than the regular 25-20 Win case and necked it down with a fairly smooth shoulder to .22 caliber. A bit quicker than the "Hornet", and inherently accurate; it became a common wildcat caliber in the USA and Canada.
In 1937, Harvey (yes Harvey) Donaldson with the help of M. Risley doing the reamer work, created the first improved form of the 22-3000 which became known as the "2R Lovell". The "2R" designation was due to the fact that it was the "2nd reamer" made by Risley that was utilized. Some references to this cartridge call it the 2R Donaldson furthur confusing the topic. The 2R Lovell has been described as the most popular .22 wildcat ever designed. J. B. Smith and Griffin & Howe of the USA both had factory runs of this ammunition made. (If memory serves me right, contracted to Winchester) . The original cases made from 25-20 SS (up to about 1935 then discontinued) are thin and "incipent head separation" is common and not necessarily signs of excessive high pressure. Later cases from Smith or G&H are much stronger.
The Lovell story does not end there, as various gunsmiths pushed the case development furthur by moving the shoulder forward & steepening it's angle to gain case capacity. This was known as the "Maximum Lovell"
Many campained Winchester and Remington for the 2R Lovell to be domesticated as a factory cartridge, WW2 came along and such interests obviously hit the backburner. Then in 1950 Remington brought out the 222 which was similar to the Lovell cartridges, only slightly larger and rimless. It is my understanding that the 222 was drawn on its own unique and new brass coin. This pretty much spelled a quick death to the Lovell series and Remington had no royalties or buy-outs to worry about. (Imagine the royalties on the 222/222Mag/and 223 line !!)
Disclaimers on any information following, as it is up to you to verify.
About 14.0 -14.5 grains of 4198 is the maximum you will be able to fit in a case without compression. Do NOT compress load !!! .
Also 4227 was a popular choise but as I got over 13.5 grains and more than 2600fps with 45 grain bullets the heads separated from my old 25-20SS cases nearly every round. These cases are not cheap either.
A fine modern choise that works well in my 2R Lovell is 12.5 to 13.0 grains of Hodgdon's Lil Gun. Again with 45 grain bullets.
As for cases, if you cannot sourse 25-20SS to convert, then try Rocky Mountain Cartridges. Great people who will turn you nicely boxed batches of 20. Although not drawn brass, I've had great success with their products including 2R Lovell.
Custom dies and reloading are of course a must and I went as far as to order a neck collet die from Lee's to minimize working of the brass.
I've gathered quite a bit of data from period publications such as American Rifleman, etc and even have a reproduction of a booklet produced in 1938 by B.L. Smith. Most of this I have compiled onto CD and offer it to those interested for the price of postage and blank CD (totally non-profit for sure).
My personal rifle in 2R Lovell is a Custom Model 8 BSA Martini which I thoroughly enjoy.