What is the opinion on the book Designing and forming custom cartridges? Does it give enough information about each round, load data and velocity with detail drawings for each cartridge? Does it give enough information on how to layout and design a new cartridge from scratch? Does anyone know if it has any .243/6mm that will push a 107gr around 4000fps? I hate to buy books without seeing first, I don't need anymore door stops.

Regards,
Jason

This is not the book you're looking for.
There is not one stitch of load data.
If you want case specs, pages and pages, you won't find a better book. And they're preceded by a few good chapters on the in's and out's of designing a wildcat.
Sounds like you want the two volume "wildcats" book.

FLORA66,

"Wildcat Cartridges, I&II" can be obtained from Wolfe Publishing of Prescot,AZ. They have a web-site, do a "Google" search. P O Ackley's "Handbook for Shooters and Reloaders, I&II" is still a good reference book but load data is a bit outdated and all loads should be reduced by perhaps 10%.
Finally, a good soft-ware program to purchase is "Load from a Disc". You can also design your own 'wildcats' and obtain starting load data. The load program is based on the old Homer Powley Computer (slipstick version) but more versatle as it provides load data using different powders other than IMR. I used it in developing the 2 wildcats that I could not find any data--the 8x57 MAI and the 338x57 MAI. If you are into experimenting/designing wildcats you will find "Load from a Disc" most helpful,IMHO.
The above info should get you started in the right direction.
Best regards, Ol' John

just neck a 7mm rem ultra mag down to 6mm- and the buy stock in the barrel maker you are going to buy barrels from- you will use plenty.

Lazzeroni's big 30-cal will push a 130gr lubed bullet to just about 4000 fps in a 28-barrel. It's basically (but not quite) a Rigby case neck down to 30-cal. I've heard tales of max accurate barrel life at less than 800 rounds which is OK I guess as this was designed as a big-game rifle and not a range-rat. Just think how long the same case necked down to 6mm would last...I doubt if you would have enough barrel life to develop a load you could use.

If you are looking for a long-range load that will buck the wind I think you need to go longer and keep your velocity around 3100-3200 fps.

Sounds like you're looking for the AccuLoad database.

How about the 244 H&H Magnum?

Dude! I had a reply all ready to go and then I checked the dates.

Why did you resurrect a thread Seven yrs old?

Ross Seyfried, I know I spelled that wrong, but,
he did a 6mm Mach IV on a 7mag imp case and got what you were looking for. It was in G&A some time back.