The bullets White sells seam to be a little undersized for a lot of guns. I have 3 White .451's a G-Series Whitetail, a old style S91 and a javalina pistol. The NE 460's shoot very good in all three, and I have a custom mold too that casts a 460 grain gas check. I size them to .450" but some of the other White shooters size .451. The sizing makes a difference. You should slug your barrel to see what you have. It is easy to do, take a spare bullet and insert into the bore, take the plug out the back then put a cleaning rod or dowel in each end and with one end on the floor tap the other end to compress the bullet, then push the bullet out and measure the goves in the bullet, should be close to .451. Once you know the bore size Bullshop can custom size bullets for you, usually you will want 1/2 to 1 thousand of an inch smaller than bore. Oh, my hunting load is 90 grains of T7 ffg and my home cast 460 grainers, same load works great with the NE too.

But if you want to shoot plastic I'm sure you can find a good combonation, one thing I have found is that the White .451 is a little smaller in bore than most .45s and the sabots are all made for the larger bores.