Feed problems in my M&P .40 full size

[LiveLife]

Which one should I believe?

Like rcmodel posted, I always go with the powder manufacturer's latest published load data (print or website) - http://data.hodgdon.com/cartridge_load.asp

180 GR. HDY XTP HS-6 OAL 1.125" Start 6.1 gr (876 fps) Max 6.9 gr (976 fps)

Since Rainier plated bullet diameters match the jacketed bullet diameters, you'll probably be ok if you use the manufacturer's published Start/Max load data at the same specified OAL. If you reduce the OAL, I definitely would reduce the powder charge.

If I can't find lead/plated load data, I typically use 10-15% reduced jacketed load data. So for HS6, I would use:
Start 5.2-5.5 gr and load test up in 0.2-0.3 gr increments towards 10% below Max of 6.2 gr.

When in doubt, be safe.

 

[nannoman]

Ok.. I can agree with being safe. I started with that load because it was the load data that I could find that came closest to lead bullet data.

It's possible that I won't be doing any more loads with the Rainiers anyway, if I can't get the feed issue sorted out.

As for the Remingtons that I also loaded at 7 grains, I'll have to go back and look again at the cases to see if there are any indications of pressure, I don't recall there being any when I looked at them at the range, but I'll take another good look at them again before I do any more loads with them.

Bryan

 

[LiveLife]

nannoman, Rainier plated bullets have the same diameter as jacketed bullets and at 7.0 gr, you are just hair over Max 6.9 gr. If you kept the same OAL as published load data, you are probably OK (although I would not exceed the max).

With Rainier bullets, I usually use mid-high range jacketed load data, but with larger diameter Berry's/PowerBond plated bullets, I use lead load data or reduced (10-15%) jacketed load data.