I started by taking brand new Winchester 38-55 brass and running it into a full length sizer to get everything normalized. It turns out that this gives a loose slip fit to my 175 and 200 grain bullets for my 9.3x57R (360) rifles which just happen to be sized to just over .367 which is the groove diameter of this Maynard. Next I primed the brass with some Remington LP primers. I tested one by firing the primer by itself. Oh, I forgot to add a critical thing. Being a 73, I had to have a way to chamber a 38-55 case and bring it out to the proper length to seal the chamber. Just so happens that along with the rifle I receiver some very nice turned brass washer like adapters designed for that purpose which support and surround the rim of the case at the proper headspace distance and give something for the extractor to grab onto. Worked like a champ. Next added some 4227 powder in the reasonable 14 grain range. Using the old drop the bullet down the chamber method and measuring from the base of the bullet to the face of the cartridge adapter gave me a maximum OAL. With the 175 grain bullet this allowed the bullet's generous base and one grease groove in the neck and with the 200 it was 2 bands and grease grooves. Now we are back to the problem of a .367 bullet loosely slip fit in a 38-55 case neck. I needed a crimp and with much trial and thought pulled out a 9.3x57 Mauser FL sizer and removed the guts. This sizer really squishes down the neck before it is pulled back over the ball. Without the guts it can be adjusted to a length where the 38-55 case neck just, just, enters the neck squishing portion off the die giving a beautiful light roll crimp to the case which adds tension and keeps the bullet from going any deeper into the the case. Now to the range.