What Happens?

Just a educated guess.

Depending on the core harness it may skid/slide down the bore without spinning the bullet as needed to stabilize it. All about the fit, if over sized by a couple of 1/1000's it should be fine. Should take the velocity just fine since the HyTec is rated for 1500 fps +. Pressure there is no way of knowing for sure without proper test equipment. Should be less than jacketed but probably higher than normally used for lead data. Will probably have some un-burnt powder too.

If you try it work up slowly looking for pressure signs alone the way.

In a .44 Magnum I've pushed Lee 310 grain GC bullets cast with clip on wheel weights plus @ 3% pewter (coated with Harbor Freight red and quenched after painting) with heavier charges of H-110 than I ever felt comfortable loading behind Sierra or Hornady 300 grain jacketed bullets.

Be aware that these loads were nowhere near as hot as some of the "book max" recipes I've seen.

They were just what I felt was max for my old 4 inch Model 29-2 (and me ).

You don't need jacketed powder charges to get cast bullets to the same velocities. There are some people using Hi-Tek up to 2800 fps with no problems.

Concerning handguns, I have found that the onset of high pressure signs appear more readily with jacketed vs cast and coated bullets.

Mr_Flintstone said:

So, using jacketed or near jacketed data, it wouldn’t be out of the realm of possibilities to push a 158 grain coated bullet at over 2000 FPS from a .357 Mag lever action rifle? That would be some powerful stuff.

Click to expand...

I have pushed cast 158s to mid 1900s using h110.
Seating long and using the powder charge, gave just over 2050. Recoil was sharp with a steel butt plate.
It's really a waste of time because it just beats steel targets to death and doesn't work well on soft targets.

I use a lot of coated bullets in various calibers. The fastest I have personally driven one (that I know of) was a 10mm at 1,419 FPS. The bullet itself could have gone faster but I was at max load data for a test. Pushing bullets to around 2,000 FPS is certainly doable.

I have loaded PCed bullets with jacketed data once or twice in my Magnum revolvers. PCed and HiTek bullets are nice, but I've no need to drive them extra fast and if I need high jacketed bullet velocities, I'll use a jacketed bullet.

As you can see from the above posts, yes you can use jacketed bullet data when loading PCed/coated bullets. I have experimented with that a time or two but saw no real advantage. I have some nice Lee 125 gr RNFP bullets, about 12-13 BHN, PCed by me, that I have driven to upper Magnum velocities in my 4" 357. Accuracy was so-so, less than jacketed driven to the same speeds, light fouling that was not difficult to remove (from the PC?). Didn't bother to run them over my chrony at the time, and soon dropped the experiment

Quick Load allows you to check a box to apply "friction-proofing" to their formulas. Comparing that with plain lead, their calculations result in a slightly lower pressure and slightly higher muzzle velocity for a given loading, generally speaking. I haven't tried comparing jacketed against coated, since QL's bullet selection is limited. I'll have to check it out and see if I can come up with a reasonable comparison. I just started coating my own, and like the absence of lube on my dies, and the fact that the gun shoots cleaner and I don't have to worry about leading. I seldom push them over about 1250 f/s.