Was thinking about making some low power 357 loads for the SP for the wife and looking in Hornady's manual they are using magnum primers in everything in the 357 magnum. Isn't that a bit of overkill?
With the SP 3"I'm not gonna cry over velocity. lolol For high velocity stuff I like 296 or MP300 in my 20" '92. Actually thinking about the 135 gr Speer Gold Dot as it has great expansion with 38 velocities for my carry round. However at this point I just need to learn the habits of our new SP101. I have a bunch of Xtreme and Powerbond 125 plated to get in the groove with.Sr40ken, That's my major complaint with the Hornady manual. They do the same thing for 44 Mag and use exclusively magnum primers …. but not for 41 Mag???? The good news is ….. Hornady pressure tests each load they list so you won't go over SAAMI pressure standards. The bad news is …. you won't get published velocities with standard primers using the same powder charge.
Another good use of magnum primers. 231 doesn't take up much room in 45 Colt case and might be sensitive to position in the case . The magnum primer seems to help with consistent ignition in this case (excuse bad pun) .I had some erratic ignition with light loads of HP-38 (Same powder as Win 231) in 45 Colt. They all went boom but some shots were noticeably lighter than others. In fact a couple of shots didn't even make a clean hole in the backer but tore it. Magnum primers will help with consistent ignition in such circumstances.