Following the instructions from the Nosler reloading guide #6, on how to determine "my" rifles overall cartridge length... Using a fire formed (not re-sized) case, I have flattened the edge of the neck, using a permanent marker, colored the bullet & placed it into the neck of the case. Then installed into the chamber, closed the bolt (not firing the pin). Open the bolt & retrieve the case & bullet, realigning the bullet to where the ink has been scraped off by the case and taking a measurement... I do this 3 times and get an average length, then subtract .015, this is suppose to be "my" rifles seating depth.
The concern I have, is taking the averaged dimension and subtracting .015, I have made a few dummy rounds (with full re-sized & trimmed cases), say... 6-8 varying over all cartridge lengths (in the process of getting the seating die cranked down the the targeted dimension I have a few that are a few thousands short). When I chamber "the one" and close the bolt, I experience some resistance (the bolt will close, but closes hard), out of curiosity I chambered the other shorter rounds and found that the resistance lessened as I traveled down the ladder.
If it matters I am working with a .300 WSM
, Nosler Ballistic Silver Tip bullets, once fired WIN nickel cases (trimmed to 2.090) and full re-sized.
Per the manual overall cartridge length should be 2.860. The dimension for "my" rifle, I come up with using the method outlined in the manual and referenced above is 2.930 (this is the dimension that is hard to close the bolt on). As I travel down the ladder and get to a cartridge length of 2.880 (the shortest dummy round I have) I find just a slight bit of noticeable resistance when closing the bolt (without being comparing to a factory round, would not be noticeable).
My factory rounds (WSM Ballistic Silver Tips) are in the neighborhood of 2.830, they all obviously chamber with no resistance.
My question is, is a hard closing bolt a concern in a situation like this, or is it merely a product of a "custom fit" cartridge? Should I go with a length of cartridge that offers no bolt resistance? FYI, the longer cartridges cycle & eject through the rifle (WIN Model 70) just fine.