Over the weekend, I was working up some new 300 WM brass that was Remington Nickel plated. This is the only brass I could purchase at the time and is my first experience with nickel brass. I just purchased an RCBS trim mate station and this is my first set of brass I've ever used it on.

The problem I had was when primer pocket uniforming, some of the brass would literally get stuck onto the uniformer. I would need to shut off the machine because it would stop the motor when I tried to get it off the uniformer. I pulled out some once-fired 22-250 brass and didn't experience the same problem with this brass, so I thought the problem might be with the nickel plating. I also noticed that on some of the brass it looked as though some of the primer pockets were actually being enlarged because the nickel plating was coming off of these brass; however, when seating a primer they were still snug. I also noticed that the primers seemed to be seated a bit deeper than usual; however, this could be due to this is the first time I've uniformed the pockets; therefore, the deeper seating depth could actually be the correct depth.

Any thoughts?

Too much pressure! Ease up on the downward force you are putting the cases. Are some of your cases hard to get started. I think this may be a somewhat out of round(dinged)pocket entrance.
When I take my time and not try to rush, things go quite smoothly on my Trim Mate.
Seems to be another application of smooth is faster.

muck

I tried it both ways really, with and without pressure.

I noticed that most of the resistance was when getting about 3/4ths, or so, inside the pocket; however, the nickel plating would be scared throughout the pocket on some, but not all.

It just seemed as though there was more resistance there then what should have been. Especially after I ran a few 22-250 brass thru it without the resistance and they went straight to the bottom of the pockets, but these were once fired, which could have some minimal effect?

graybird, I have loaded a LOT of NP plated brass, and I haven't noticed it to be any different than regular brass as far as primer pockets, meaning that I have had tight pockets like you have, and not so tight in both types. As long as your depths are consistent, I think you can just chalk up the deeper pockets on this brass to them having slightly different specs on the thickness of the rim of the case, which would vary the depth of the pockets....if your primers are seating firmly, I would just shoot em, and then see if they are more 'straightforward' next time around.

good luck

Nickle is a hard metal. Much harder than brass relatively speaking. So some difference in "feel " is to be expected.
That said I think Fish30114 has it with differences in the dimension of the brass.
I have also noted differences in lot to lot and maker to maker of brass in the feel while uniforming the primer pockets.

muck

Thanks for the comments guys. I'm gonna try to burn some powder thru them in the near future. Hopefully, I'll have good news.