Load data to keep 40 S&W out of long barrel subsonic.

[Tackleberry41]

Bought one of the Mechtech uppers for a glock 22. Any data in a book is for a pistol. Using cast 180s and min data in Lyman cast book still pushing past that barrier.

One of the lowest velocity they listed was Unique at 4.6gr for 926FPS, there were a few other powders showing slightly lower velocities, but not ones I have. I know they have a minimum, can you safely go to 4.5 or 4.4 to get the velocity down? Or am I going to have to buy a 200gr mold?

[garym1a2]

Try about 3.7 of WST or Bullseye, they both reduce well.
Look up 40 S&W Minor loads on Google.

Here is one liked.

http://www.handgunsmag.com/2010/09/2...40lite_091806/

[Doc_Stihl]

I'd try trail boss @ about 60% of "loaded" case capacity. Read up on how to determine your cartridges powder space. NEVER COMPRESS TRAIL BOSS.

[robertbank]

3.5 gr to 5.2 gr of 231 is sub sonic out of my 5" M&P Pro and 5" Tanfoglio using Lyman's 175 gr 401638 boolit. I have also used Titegrop at 3 gr - 4.6gr under the same boolit and out of the same guns.

Take Care

Bob

[Tackleberry41]

Problem is gonna be anything thats subsonic out of a 5" barrel probably isnt out of a 11" barrel. Not sure trailboss would cycle a weapon. Found a load on Hodgdens site using clays that worked and cycled the gun.

[robertbank]

3.5 gr of 231 will cycle the gun and certainly remain sub sonic out of the 11" barrel using 180 gr bullets.

Bob

[oldgrunt]

need help on 16" carbine with 200 gr lead projectile. Nothing in any of my load data books.

[44MAG#1]

I shoot a 200 grain cast from a 3.43 inch barreled M27 Glock at 750 fps with 3.8 grains Unique.

[megasupermagnum]

You can definitely back down on Unique if you want. I have no idea where the threshold of cycling will be, but I would be surprised if only a little below starting load doesn't cycle.

[FergusonTO35]

Try 3.5 grains Clays. Clocks 850 fps out of my Glock 22 and is reliable and accurate.