7prc

[Ridgerunner67]

I just picked up a new seekins ph3, has a 22” barrel. So I’m brand new to reloading and I have two pounds of n560. I’ll be using gm215m primers and 160 grain nosler accubonds. I’m having a little bit of difficulty finding good load data with that powder and my set up. Anyone having luck with that powder?

 

[Andouille]

VV has load data for 165 Sierra TMK and N560 (56.3-62.2gr), while it's a 5 gr heavier bullet, the you might start at 2 gr below the max charge of 62gr and work your way up in 0.5 gr increments to 0.5 gr above max charge, stopping when you see pressure signs on the brass, or feel a hard bolt lift. Load 5-10 rounds 0.5-1 gr below pressure signs and shoot to see if you get a decent group.

For another check, your load should be in the ballpark of 58-64 gr Hodgdon H4831/4831 SC for 162gr ELD-X which has a similar burn rate to N560. Always look at multiple sources of data to get a starting point in case one is way off base.

Use the Nosler load data COAL as a starting point, or if you can measure distance to the lands, then googling suggests it shoots well +/- 0.050 jump in most calibers. I've found that the 130 AB likes 0.080" jump in my 6.5CM Tikka, but every rifle brand and caliber can be different.