I have just had a .404 built on SSB Mauser 98 which was originally chambered in 30-06. The suggestions noted above are on the mark regarding the amount of time and money required to do a custom build. I was fortunate in several ways regarding my project as the action that was purchased had original styled scope rings which were sized for a 30mm scope. Ended up picking up a used Swarvoski in in 2.5-6x in fairly good (useable-not mint) condition for a fair price. A Chrome Moly Krieger bbl was ordered and purchased (6 month wait) and new bottom metal and follower from Duane Weibe was purchased along with a new 3 position safety and new trigger from two different vendors. Then all of the components were sent off to a well regarded gunsmith/gun builder who agreed to take on the project but only to do the metal work (barrel install with chambering, bottom metal fit, trigger install and adjust) and to open up the rails for feeding and chambering. Also had a three leaf rear and ramped front sight installed by the same builder. This has been about an 18 month project thus far and I am supposed to get the completed metal back the week after Christmas 2012. All in all unless you really have the time and $$$ to do the project right I would go with what is suggested above (CZ etc). Actually, and if you are a patient sort, .404 '98 Mausers will occasionally pop up for sale at US auction houses and these can be purchased much more inexpensively than do a custom build on a '98 action. You may ask why I took the time and spent the money for the project noted above. The answer is easy. It was because the action that I used is an original factory single square bridge Mauser 98(it was sans barrel) with those 30 mm rings. All in all a incredibly rare find and what better way to bring an old action back to life but to have it done up in a truly classic low pressure African cartridge. The .404 Jeffery. It was a natural choice and I don't regret it one bit. Jeff S.