458 Lott with 450 grain GS custom HV

[TNDave]

I was able to snag 100 .458 GS Custom 450 grain HV bullets and am looking for load data for these in 458 Lott. I have Quickload software but these aren’t listed and searching hasn’t turned up much information either. Any help would be greatly appreciated.

 

[fourfive8]

I load the GS Custom 450gr FN monolithics in my 450 Watts (Lott cousin) without issue. I used Barnes TSX Lott data and started at the minimum and worked up. I used a chronograph in the process. GS Custom also has some load guidance and info- http://www.gsgroup.co.za/loaddata.html

The GS Custom bullets act a lot like the Barnes TSXs. I also found Hodgdon Benchmark to work well in the 450 Watts with 450 gr bullets.

The only thing you might run into with the SP and HP GS bullets is OAL length issues. But I don't know for certain and have never loaded the GS spire points- only the FNs.