Sierra 115 grain sportsmaster load

[JoeInTucson]

Does anyone have a load for these that runs in Glocks?  

[Alaskapopo]

Need to bring the OAL down and reduced the powder charge.  

[ysrracer]

Plunk test.

[Braxton1]

1 hour ago, ysrracer said:

Plunk test.

 

With the Gen5 barrel, this is GREAT advice, especially for those bullets like Sportsmasters that have a long bearing surface. 

 

The "Glock Marksman Barrel" is relatively short-throated for accuracy enhancement.  It's not as bad as a CZ Shadow, but close.  If you're loading out towards the maximum SAAMI overall length, the bullet will hit the rifling during chambering.  This can result in "Failures to Chamber" where the slide won't fully-close.  In extreme cases with low case neck tension/crimp, it may actually pull the bullet out of the case and spill powder everywhere when you try to clear the malfunction.

 

In addition to Brad's suggestion above, I'd recommend "plunk-and-spin".  Drop the completed cartridge into the chamber, press it firmly in-place with your finger, then grab the rim and try to spin the cartridge in the chamber.  If it won't spin, it's probably still hitting the rifling, although lightly enough to still "plunk".  Seat a few thou deeper until it will freely spin in the chamber.  Once it'll do that, you have your target OAL.

 

For powder charges, I'd start around 4.3 of N320, 4.8 of 231/HP38, or 4.6 of TiteGroup and chrono your way up to what's required.  Please just remember that you'll be at the upper end of SAAMI specs by the time you hit USPSA Power Factor floors with 115s....