Another project kind of on the back burner for now is load development in the 10mm (Glock 20SF) with Barnes copper bullets for hunting usage on deer.  Lead and lead-core bullets went the way of 8-track tape decks in California as of 07-01-19.  It is all unleaded here now in the hunting fields.  I would love to hear back from anyone with real-world experience using these combinations.  TIA!

My "range ammo" for my 10mms has always been my reloads.  In the 3rd Gen Glocks 20SF and 29SF, that has meant Hornady 180 grain XTP or HAP at +/- 1200 FPS.  In the S&W 1006 and 1026, castings have been the rule, both 175 Lee truncated-cone/conventional lube groove variant and the RCBS 200 grain truncated-cone design. 

I have been a pretty active bullet caster since 1981.  One of the larger discussion areas within the casting community has been "Polygonal-form bores and their safety with cast bullets".  LOTS MORE heat than light gets generated in these discussions.  What follows is my viewpoint to the present time.

A few years ago I ran 4 designs of cast bullets sized at both .452" and .454" through a couple Glock 21 pistols.  Two provisos, up front--1) Glock 45 caliber bore forms are octagonal, vs. the hexagonal bore forms of their 9mm, 40 S&W, and 10mm barrels.  2) the 45 ACP is a VERY lead-friendly caliber--low op pressures, fairly slow rifling twists, very consistent bore dimensions over the years.  9mm is the polar opposite, 40 and 10 tend to have consistent dimensions but retain the fast twists and high op pressures of the 9mm.  Dimensionally, the 9mm is all over the place.  For purposes of bullet casting, the 9/40/10 should be treated as RIFLES.

The Glock 45s were a delight with castings of both sizings and all 4 designs.  Zero leading, even after 800+ rounds without cleaning in one of the pistols.  Nothing exotic about alloy or lube, either--92/6/2 metal and Alox/beeswax lube.  Kinda pedestrian, that. 

I am about to start extensive work with castings in our Glock 40 S&W and 10mm pistols.  I will make haste very slowly, and I get even a hint of lead deposits anywhere in the bore I will suspend further work with the Glocks and give Bar-Sto Barrels some business.  Slower twist rates and conventional rifling de-complicate cast bullet lifestyles MARKEDLY.  And if you hear of any mushroom clouds rising east and south of Joshua Tree National Park over the next few months, you will know that my experiment came to a bad end. 

Jury is still out, IOW. 

New guy here, but not to the 10mm Auto nor to reloading or to bullet casting.  Currently own 2 Gen 3 Glock 10mms, a 20SF and 29SF.  In the past I have owned S&W 1006 and 1026.  A recent change in CCW regs for retirees at my old shop have opened our carry options to include the 10mm.  The Glocks were purchased to exploit that capability.  I have in the past hunted medium varmints and deer with the 10mm, and may do that again this Fall.  I am going to peruse the contents of the site for a time, and may have a few questions on specific subject areas.  Thank you for accepting my membership here. 

Allen Paine
Redlands, CA.