I picked up 1000 HST jacketed hollows points for a really good deal and want to work up a load for my 10mm 1911's, both have 5" barrels. I have been using 6.4 gr of 231 under a 180 gr RN with pretty good results with accuracy. My objective here is more for accuracy over max velocity.

I do have other powders to work with... CFE Pistol, Longshot, Unique, Tight Group. Question here is were do I start, which powder is the best to use? I do not have objectives to pushing the envelope a little, just want to stay away from super max loads. I don't want to beat my pistols up pushing the limits. Just want some tight groups and a true 10mm load. And I do understand that what works in my pistol may not work in another, looking for a good starting point without wasting reloading components.

This what you need?

https://gregcotellc.com/cart/springer-precision-base-pads-c-195/ria-springer-locking-platemagazine-insert-actmag-ria-1911-a2-p-1769.html

Or you could just get a new mag until you find the parts. I bought mags from them and added the Springer extended base plate.

https://gregcotellc.com/cart/armscorrock-island-actmag-c-152/rock-island-armory-1911-a2-40-sw-or-10mm-16-rd-p16-oemp164015b-p-1612.html

These folks are great to deal with, and the prices are not to bad.

My RIA 10mm does it,but as it is getting broke in it is less prevalent, I think once it settles in it may even stop doing it because it is almost not doing it now. I only have 200 rounds through it now. The loads I'm shooting are pretty spicey at 1200 FPS, and the brass is even pileing up in a nice pile about 8' behind me over to the right side a little. At first it would fling it at any random area about 30' away.

If it's not broke don't fix it.

unless you are having feeding problems their is no gain.