Adjusting seating depth?

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Cheers gents. Very helpful replies. Apologies as normally I prefer to reply individually but it’s probably easier to reply just once.

So my friend was loading 130grain Nosler Ballistic tips, random brass cases, and 52 grain of reloader 19 with cci large rifle primers,(if I remember the primers correctly).

I was shooting nosler 130grain accubonds, new Norma brass,(May have been an issue) and cci br2 primers with n160.

No idea how crimp varies? He may neck size whereas I was using full length dies.

Now I did get a nice grouping with 52grains of powder but I was getting dark sooty cases on ejection - unburnt powder?Whether this was a factor in the new brass or my choice of primer I’m not sure.

Any suggestions of where to go would be appreciated?

I’m thinking, start again from scratch with clean, once fired brass and a magnum primer? And work up from scratch. If this doesn’t shoot I’ll change bullet choice!

The sooty cases can also be lack of bullet grip in the case neck, sorted by seating deeper. Otherwise what you proposed Sounds like a plan. Just clean up cases with fine wire wool and a cloth. FL size. Go onto noslers website and find rec OAL for the 130 BT. Load up in increments up to or just under the Viht max quoted above. Let us know how you get on.