Re: 338 cartridges
All of the 338 snipe-tac rifles i have built so far have been sub 16# hunting versions. With a muzzle brake and top loads with the 300MK bullet you can expect recoil similar to a 300win mag. With out the brake i have shot it as well, on a bench the recoil is up with the 458 win mag in a ruger rifle, i didn't care for that at all. Muzzle brakes are the only way to go with the lighter weight rifles. 25# rifles on up prolly don't need a brake. With the 300MK loaded to 3400fps and all that energy you will have medium felt recoil. I just finished a 12.5# rifle for a customer, it didn't recoil anymore than my 16# rifle, with identical brakes. I call these rifles "carry ridge rifles", you can carry them to your spot, set up for a long shot to the next ridge. I personally took mine to wyo this summer to check out some elk spots, laser ranged numerous areas, most shots were in the 800-1200yd range. With the scope sighted in at 300yds, i could use the Mil-Dot redicle for everything out to 1200yds with out changing the turret. 1200yds needed 17.25moa for dead center hit, my bottom hash mark is exactly that on my IOR scope, on a NightForce scope its even more, 1400yd range. We only fired several shots at rocks during the hunt test, my cousin didn't want to spook any elk staying in the area. He is a very small man, 130# 71 years old, he did all the testing with my rifle. He said it recoiled about the same as his 300H-H mag rifle. After all the testing we did, he ordered one. Said this rifle will extend his ability to hunt elk, its getting harder to hike into rough areas he said, this way he can set up a spot on a high ridge and watch the areas across the canyons.
The 408 c-t case is a re-designed 505 Gibbs, but you can not use the Gibbs cases in the 408 wildcats, they will not stand the high chamber pressures.
The 338 wildcats from the 408 c-t case is a major rush to shoot, from ignition to 1000yd target hit, 1.04 seconds, you barely have time to look up and see the dust behind the target. Accuracy is top notch, the heavy high bc bullet cuts through the wind as well. Parent cases are under 2$ ea.