Home Forums Hunting & Shooting Handguns 10 mm semi options

We compete LR steel....I can't make ammo much better than Prime for 6.5 Creed. ES very low. Accuracy stellar. Use great components...or did. Think they're belly up. HSM was stellar as well.

I have Underwood bonded 180s I just received. Will try a 5 shot with those tomorrow. Post results if anyone is interested. No Chrono anymore. Not gonna tape my Magneto on the pic rail

Found the 10mm penetration charts on LuckyGunner pretty informative. My 10s are not personal defense. Backcountry defense. I am not a fan of HC from personal experience. Why I am trying the Bonded Gold Dots. Looked very consistent in penetration/retention/deformation. FPS was where it should have been as well. 1250 is good enough.

Just ordered this.


XD(M) 5.25" 10mm

10 MM Hard cast in Glock Barrels from Buffalo Bore

https://www.buffalobore.com/index.php?l=product_list&c=59

I’ve shot a ton of hard cast bullets in all of my Glocks. Hadn’t hurt a damn thing. The key, as the article states, is the hardness of the bullets being used.

I got a 1995 G20 new in 1998.
I did overload work ups with 200 gr bullets, 800X and Power Pistol powders.
The recoil spring is weak. I built a triple recoil spring assembly.
The case support is poor. I bought a number of aftermarket barrels.
The 10mm cases with large primer pocket are weak. I used 40sw brass in throated 40sw barrel in the G20.

How is the case support in the springfield compared to the Glocks?

Just walked in from ripping off 30 rnds of 180 grain and 13.2 AA9. Cases are perfect. No bulges on at 13.8 either. Non issue with the XDm

Been looking at that pistol. Please post a report when you get it.

Plenty of case support in the XDm

that looks pretty good, does anyone make an aftermarket trigger for the springfield?

Powder River Precision.....ordering today. But it's decent from the factory. Very different feel than a Glock trigger

Update on the KKM 7" 10mm barrel for the Glock 40.

I have a bunch of CAS .38-40 180 gr. soft lead bullets I'm gonna try to shoot in the 10mm with Unique.

Bottom picture shows 7" KKM barrel in the Glock,

.38-40 bullet, far left in the photo. It looks fatter, but is .401. The meplat is larger and the taper not as slim as the truncated cone 40 cal. cast bullet. I'm hoping the KKM will handle soft lead, as I have a bunch of them. Hope the gun will feed them.

Loaded round is a 180 hard cast truncated cone, next 180 FMJ, last 180 Horn XTP. Haven't shot the .38-40. Of the other three, the XPT is the most accurate, FMJ second, cast third. That may change with the KKM barrel.

DF

I do the same thing. About 4-5 years ago I had kkm make a barrel for my gen 3 sf 20 chambered to headspace a 40 case throated at 10mm length. With 180s and 200s I can seat them out to 10mm length and still have enough bullet in the case for grip.

Everyone told me I was crazy loading them to 10 speeds and that I'd blow myself up. I kept trying to tell them that small pocket 40 brass is stronger than the large pocket 10mm brass. They still think I'm crazy but it's been awesome buying super cheep once fired 40 brass and loading it once, letting it fly, and not worrying about picking up brass.

Bb

I did that for years myself, and it used to be fairly common in certain competition circles.

It's not so much that the 40 case is stronger (the failure point is not the primer pocket), but more that the 40 brass has less grip on the bullet and produces lower pressure for the same load. In my measurements with most bullets, identical full power loads in 10mm and 40 S&W brass produced about 50 fps less in the 40 S&W brass.


Dirtfarmer - one suggestion - use a lot less crimp on the lead bullets than your picture shows. Too much crimp is a pretty common error for cast bullet loads. Particularly with softer bullets, too much crimp can ruin accuracy and promote leading. For my semi auto cast bullet loads (in all calibers) I only crimp enough to mostly remove the flare in the case mouth, no actual crimp into the bullet. That gives best accuracy for cast bullet loads.

Thanks for the tip. Will do.

DF

Looks good, DF. Looking forward to a range report!

Thanks,

I appreciate Yondering's tip on not over crimping with soft lead bullets.

My Dillon 550B has been set up for 10mm. I want to try Unique with the .38-40 bullets, probably around 6 gr., have plenty of it

I'll load a few and see how they feed and cycle.

DF

RE: Crimp I am using a Lee taper crimp die in a stand alone stage. Single stage press. I HAVE had bullet set back in the past. Guessing this is a very sensitive aspect of loading? A 32nd of a turn on the die goes a good ways. I do see some much better accuracy results going lighter. Guess I will have to run some full mags through with the load and check every 4-5 rounds? These are jacket bullets/XTP

I assume KKM can supply that barrel threaded?