The trouble with trying to get a 350gr. bullet only going 2,000fps in the 3 1/4" case is with too-low loading density, hangfires, missfires and possible chamber ringing. A very slow powder would have to be used that produced a full case - probably needing some compression to get the powder to burn properly. This is why Shilo Sharps does not warrant smokeless in their Sharps with 3 1/4" lengths- apparently.

Make certain you use the space inside the case with a good filler.

Nickle plated cases are not stronger than normal brass to any discernable degree, - my opinion.

We've run a .45 3 1/4" Sharps with Re#7 and 300gr. bullets at 2,200fps with fairly low pressure(indicated) using 62gr. Re#7 powder and heavily compressed kapok to fill the case. It shot 3-shot, 3/8" groups (cloverleafs, 3 groups in a row) off the bags at 100 yards every time, my bro shooting - tang aperature sight with pin-head front.

No heavier jacketed bullets were tried with smokeless, but, 500gr. Hornadys shot well with 100gr. 2F, excess space taken up with 7, 1/10" wads to the base of the bullet. This one also cloverleafed at 100yards, went the full length of a bull moose and stopped underneath the hide on his rump - non-expanded - moose took 2 steps, lay down and died. Possible velocity may have been about 1,350fps.