For all out there that don't know it, the bore to land differential in almost all calibers today is .008" or 8 thou, this gives .004 deep lands and is the industry standard for button rifled barrels. You can get whatever you want but shallower is of no advantage and deeper tends to cut jackets and is harder on equipment when making barrels. So a 234 bore or bullet dia. barrel would have a groove dimension of .226"
Got a call into Marshal and my favorite barrel guy to work up a budget for bullet dies, barrel drill, reamer and button, or possibly buttons....1-8"....and maybe 1-9". Will have to make up drawings for Dave @ PT&G for reamers, and Dave will also make sizing die reamers as well, so it solves the custom die problem. I'll also have to get a neck and throater or 4 from Dave as well. Probably go with 2 different neck thicknesses and two different throat lengths of each. Then like I said I'm good for cartridges based on the 250 Sav, 250 Sav AI, 243 Win, 284 Win, 204 Ruger and 22 K-hornet without additional cost. If anyone has any 22 cal based reamer with a removable pilot, I'll be able to make a 23 cal based on it 22-06, 22-6mm Rem (or X57), 22 X39mm, 22 BR etc. etc. etc..........
Just got off the phone with Marshal and good news is we can make flat base and rebated boattail bullets with the same dies, in any weight but the ogive will remain the same throughout. He's getting quotes and availability as I type and may have some info tomorrow. Both of these styles can be bonded as well so excellent for hunting. Ogive length I don't know enough about but I'm leaving that up to Marshal, I'm not a bullet designer. Anyway I'm thinking bonded 80, 90 and 100 gn to start off with, in a RBT design with likely a 10s ogive, don't want to go too long in the ogive so as to eliminate something in the 60 gn range. Anyone have any other thoughts as to bullet weight and design, speak up..........
Got another question for you guys as to preference of cases, I could easily make this with a .473 base as well for the Penguin design, then any 57 mm cartridge could be run down, trimmed and fireformed, 6mm Rem, 257 Rob, even 7X57 or with more work and neck thinning even 30-06 or 270 could be used.................what say you????
Gonna have to buy me a bunch of Lapua 6.5X55 brass..........