In the process of building a thumper for moose in dense bush. In the past have tried a custom .338-06 and .375 Whelen Imp. They were built on `98 Mauser actions and didn`t feed worth a damn from the magazine. Never tried a factory .35 Whelen because of the slow twist Rem puts in their Whelens. Have read from others that Rem Whelens will not stabilize the heavy 250 gr bullets that they really should be shooting. Have a whack of .300 WSM brass. Necked some up to .35 caliber with a tapered expander ball in a .358 Win sizing die. Looked pretty good. So here goes with another project. Bought a used Rem SPS .300 WSM from a chap. Looks like the barrel was used for a tire iron. He said "don`t ask" so I didn`t. Have jacked live rounds through the action while pointing safely down range. Feeds smooth. Will get a McGowen 24 inch .35 caliber blank, Remington profile. Reamer will be from PT&G. Seated bullets in the trial cases with a Hornady .300 WSM die. Didn`t mark the bullet. A machinist friend will hone out a .300 WSM Sinclair body die to .358 for full length sizing. Comparing powder charges in reloading manuals, the .35-300 WSM should be midway in velocity between the .35 Whelen and .358 Norma Mag. Can plink with cheap handgun bullets. Shown below left to right are .270 WSM, .300 WSM, .35-300 WSM. Has any forum member chambered for the .35-300 WSM? Would be interested in your results.