10MM Reloading - 1st Day on the new caliber

[jcerillo70]

Going through my lee and lyan manual's i came up with 2 test loads using 200 gr lead

1. 4.8 gr. of W231 seated at 1.265 OAL with a light lee factory crimp

2. 5.3 gr of W231 seated at 1.265 OAL with a light lee factory crimp

The OAL to barrel ratio is my only Concern, Only because this is a high pressure round with a Min OAL of 1.240 (LEE Book).

Here's some pics

Im basing it off of this


Here's 1.265


Heres 1.249


Now the 1.249 in this lone wolf barrel fr my Glock 20 looks like it would be the correct OAL for this barrell.BUT in my mind it seems to close to the MIN. OAl to even go near it.

Any advice guys? Thanks alot!

 

[GLOOB]

Still looks too long to me. Unless your OAL is precisely repeatable, you should leave a little room for error.

Hodgdon lists 4.6 as a starting load for an FMJ at 1.26". So, yeah. I think I'd back off the starting charge there.

 

[noylj]

I do not believe that Glock barrels have a barrel hood that can set the head spacing like a 1911.
You might need to actually hand cycle some inert dummy rounds to ensure that the slide fully closes. Glocks are well known for firing out of battery.

 

[41 Mag]

I set up all my 10mm loads just like the second picture of the series, no matter what bullets I am shooting. If not I get quite a few which fail to chamber properly on a quite regular basis. You might be able to get away with a bit more, but not in my barrel.

 

[janobles14]

10mm once fired brass has more of a tendency to stretch IME. after a FL size it can run out even more. make sure to check your case length prior to loading. it headspaces the way most other straight walled autos do, rim of case mouth.

 

[jcerillo70]

Hodgdon lists 4.6 as a starting load for an FMJ at 1.26". So, yeah. I think I'd back off the starting charge there.

For lead it starts at 4.2 and max's at 5.6

I just made a batch of 4.3's to test also, but i bought this gun for high power defense rounds. I think 5.4 is going to be the magic number here

10mm once fired brass has more of a tendency to stretch IME. after a FL size it can run out even more. make sure to check your case length prior to loading. it headspaces the way most other straight walled autos do, rim of case mouth.

That might be why it appears like this. Like i said 1.249 is to close to the MIN of 1.240. and 0.009 isn't going to give it a big difference seated in the barrel. I have 500 pieces of starline on the way. Ill use these 100 once fired as test rounds.

 

[psyshack]

How does the brass set in the chamber when resized with no bullet?

 

[jcerillo70]

How does the brass set in the chamber when resized with no bullet?

Part 2 of my question is

I loaded up according to hodgedon & LEE, with a range from 4.2 @ 870 fps-5.6@ 1011 fps > 3 test runds with 200 gr lead TCFP 18 brinell at
4.3 gr.
4.8 gr
5.3 gr

Countering that info is my lyman 49th manual which ranges from 5.6 @ 984 fps-6.3@ 1067 fps.

Did i load too light?

 

[loadedround]

One very easy way to check for cartridges fitting you chamber is purchase a case head gauge made by L.E. Wilson or Dilon Precision (Dillon gauges run 14.95 for 45 ACP). You simple drop your loaded round into the gauge, which is designed to be a minimum sized pistol chamber and you will be able to tell immediately if your loaded rouund is seated correctly and sized properly. These gauges work great on all Glock calibers. Get one!

 

[PO2Hammer]

You shouldn't be trying to headspace on the bullet in a Glock. That diagram is for target loads in a 1911.
Glock 10mms will actually end up headspacing on the extractor unless your brass is near max SAAMI case length (which is why you can shoot .40 ammo in a Glock 10mm in an emergency).
10mm brass doesn't stretch for me, YMMV.
You should be making up dummy rounds (no primer, no powder) and cycling them into your gun from the magazine to check for function. I can't imagine your 1.265" load is even going to cycle into the gun.

 

[jfh]

I've loaded lot of 10mm, although not recently (have enough). I even blew up an early Glock 20; now I shoot either a Kimber or EAA 10mm--and my experiences are the same as PO2Hammer's.

Set your LOA with the function of your magazines and pistol--and then tweak the recipe as needed to adjust for a changed LOA.

Jim H.

 

[psyshack]

jcerillo70

That looks great! Brass length looks good for your chamber. Extractor should engage the the brass perfectly.

Now what I would do at this point is put a bullet into the empty uncharged brass. With a seating depth just off the lands and grooves. Then check that oal against your book. And see what you come up with.