50-90 paper?

[Kurt]

Gunner I spent a lot of time/years behind the buttplate of the .50-2.5 with a 22 ROT and I can swage a 2" long PP bullet for it and sending a lot of lead down range of different lengths during calm Montana winds to winds 35 mph plus testing these different bullets and the 1.495-1.5 performed the best in all conditions. I also found the faster I pushed these loads in stiff winds the more wind deflections I got. Pushing the 1.5" bullet at 1285 fps using 1F Goex exp the same bullet had less drift than a bullet pushed with 3F EXP. at 1360+ fps.

You mentioned above that you would like to shoot dirty 4-5 shots with that .494" diameter unpatched PP bullet. This won't happen because it's patched to tight to bore even using Seth Cole .55 W or 55Y unless you use a cartridge seater and then all bets are off for any accuracy.
For shooting dirty you do have a few options, like a Tapered bullet seated in the case so the taper is less than bore diameter. or a PP bullet at lesser diameter with a proper alloy mix so it will obturate filling the grooves. But also you can use your .494" patched holding the patch back 3/32" back from the ogive radius and deep seated in the case so it will chamber when the throat is fouled. But this will reduce your powder load quite a but for that long bullet your using to hold stability.

All this your going have to spend some time being that rifle testing what will work to get what you want shooting dirty.
Target work that diameter is probably the best but not for repeated hunting shots with out fouling control unless you have Super Mans Thumbs