ntonkin Posted March 10, 2018 Share Posted March 10, 2018 I have a new Kimber stainless target II LS and am reloading 10mm for it. I am a little confused about loads from different references. I loaded up a box using my Speer reloading manual 13 which listed 8.0 grns of Unique under a 180 grn bullet. Now I notice in my Sierra manual the the max load for Unique under 180 grn bullets is 6.3 grns. Why is there such a difference? Should I be concerned about shooting these rounds in my new Kimber? Link to comment Share on other sites More sharing options...
Guy Neill Posted March 10, 2018 Share Posted March 10, 2018 Best is to use the data compiled by the maker of the bullet whenever possible. Different bullets perform differently. Many Speer bullets are plated whereas Sierra bullets are jacketed, meaning the data will be different. The harder jacket is harder to push into the rifling, so pressure will build quicker. So, best to match the bullet to the data - Speer for Speer, Sierra for Sierra, Hornady for Hornady and so on. Lead bullets are fairly generic. Guy Link to comment Share on other sites More sharing options...
ntonkin Posted March 10, 2018 Author Share Posted March 10, 2018 The bullets I'm using are also plated so I'll not worry too much about excessive pressure. Alliant's loading chart agrees with Speer. Thanks for the reply, Nick Link to comment Share on other sites More sharing options...
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