I'm new to this forum and looking to load some 10mm.  Loads will be moderate, using 8.5 to 9.0 grains of Longshot with Hornady 180 XTP or Speer 180 FMJ in starline brass.   For primers, all I have is standard Federal Large Pistol #150.   Have about 6K of these....In all my research on 10mm loads, I hardly see any mention of folks using Federal #150 primers and am curious as to why.   Seems like most folks favor CCI350 mag primers or Winchester.    Will I have any issues using Longshot with a 180 gr. jacketed bullet for moderate loads with Federal primers?   

Also, what are the preferred primers for this type of load?   (I can at least get my name on the primer list at my local shop). 

Hi all,
I'm new here and am looking to develop a load for my new Glock 20 Gen 4.   I've recently replaced the factory barrel with a KKM barrel cut to 5.4".  I've read that Longshot is a good choice for medium to full power loads with 180 jacketed bullets.   I don't know, however, if I can use Longshot with 180gr. hardcast (truncated cone flat point).   The bullets have a brinell hardness of 18 according to the manufacturer (Rocky Mountain Reloading).  I'd appreciate any advice.  If not Longshot, what would be good powder for 180gr. hardcast? 

Thank you!