Remington UMC casings.I have

[RustyRudder]

I have about 300 of these casings.They have a nickel finish.They look really good but are there good for reloading?

[The_Shadow]

Remington UMC are good to go.  I will say that the newer nickel is not as good as the older nickel platings.  The newer plating tends to wear off easier (long periods of tumbler polishings) and in some cases chip off.  If you find plating chipping or flaking off, don't use them in steel sizing dies as the nickel can mess up the  finish of the dies.

[RustyRudder]

Thanks Shadow.I use hornady nitride dies.Do you think I will be ok loading them with 12.5 grains of bluedot with 155 gr fp bullets or should I work them up.I load my 155 XTP'S with 12.5 grains of bluedot in new cases but haven't tried them in once fired cases.I was wanting to load as close to my SD loads as I could for practice.

[oldman10mm]

New cases vs once fired and sized cases should see no difference in pressure/ballistics.

[Taterhead]

Thanks Shadow.I use hornady nitride dies.Do you think I will be ok loading them with 12.5 grains of bluedot with 155 gr fp bullets or should I work them up.I load my 155 XTP'S with 12.5 grains of bluedot in new cases but haven't tried them in once fired cases.I was wanting to load as close to my SD loads as I could for practice.

12.5 works fine in my gun, but would highly recommend reducing and working up. Your set of variables might be slightly different than mine, so the data isn't plug-and-play. Velocities can be higher for slower burning powders with new brass. The squeaky clean interior really grips the bullet. That results in higher bullet pull, and allows the powder to get a better burn. As brass is reloaded, it will also lose some neck tension due to work hardening. That will have a deteriorating effect on bullet pull. Once fired brass should still be pretty supple though.