Pushing my 10mm glock20, need a better barrel

[Float Pilot]

I still load my hunting rounds that way (very hot), because I usually only shoot one round and its over.

Exactly. My situation dictates that I carry big critter loads in the pistol. If I have enough time to change loads for tow legged critters, I will have enough time to use a rifle. This G20 is just going to sit on my chest while I am out working. I have other shootin irons around the homestead for any problems here.

Yes I know I could go back to carrying a model 29 or a Red Hawk. My 310 grains hard cast loads at 1,200 from my 6.5 inch M29 has loosened up three of them...

The view from my mobile office:

 

[Casefull]

That country is so beautiful. I need to get up their again. Thanks for the picture.

 

[varoadking]

I use a Wolff steel guide rod with #20 recoil spring and KKM barrel in my G20SF.

I'm well pleased with the results...

 

[Drail]

I think if I lived up where you are and needed to deal with things that will eat you for a snack I would carry a couple of M 57s or M 29s (and maybe some guy to back me up with a .458 Win. rifle and some grenades) That is a gorgeous photo you posted.

 

[Float Pilot]

Just chronographed a few more loads.
Temp 20 degrees F. Alt 350 MSL
Chronograph at 12 feet from the muzzle

Average velocity of 5 rounds Factory Loads from G-20SF
200 grain Hornady XTP= 1,050 fps (huge group)
175 grain WW Silvertip= 1,195 fps (Ok group)
180 gr Fed Hydra Shok= 955 fps wimpy FBI loads
200gr CorBon penetrat= 1,065 fps Not as advertised
200gr Norma FMJ (1980s) = 1,177 fps Very accurate, very clean, best accuracy of all factory ammo. Just need a time machine to buy more.

Today's Hand-loads
*200 gr XTP, 14.0gr AA#9, CCI-300,star-line, 1.255col, = 1,169fps good grp
200 gr XTP, 8.4gr 800X, CCI-300, star line, 1.259col, = 1,100fps large grp
200gr XTP, 13.8gr AA#9, CCI-350, Starline, 1.257col= 1,190 fps OK group
*200 gr XTP, 13.8gr AA#9, CCI-300, Starline, 1.257col= 1,136fps good grp
*Best groups of hand-loads today.

180gr Speer TMJ. 9.8gr 800X, CCI-300, Star-line, 1.257col=1,235fps huge grp
Note velocity spread from 1,190 to 1,280 fps during 15 rounds fired
180gr TMJ, 14.5 AA#9, Fed 155mag, Hornady brass, 1.250=1,168 blown primers, bad grp. no otehr presure signs,,, wonder about those #155 primers

180gr TMJ, 11.0 gr Blue Dot, WW WLR, Star Line, 1.250col= 1,190fps good grp
(this was 20-25 year old Blue Dot by Hercules not the new stuff)

 

[Float Pilot]

I would carry a couple of M 57s or M 29s (and maybe some guy to back me up with a .458 Win. rifle and some grenades

)

The problem is weight.... A gallon of AV Gas weighs 6 pounds.. Clients food, gear and water also have certain weights. Usually too much...
So I am often out in the middle of nowhere with just my survival vest gear and a titanium 22.

 

[Full Metal Jacket]

I have been pushing 200 grain bullets up to 1,200 fps , but I am seeing signs of brass bulge near the unsupported chamber area. Plus any loads over 1,130 fps start to show crappy groups in this pistol...

my g29 and g19 both show evidence of brass bulge. most glocks do.

as far as the crappy groups, have you measurable the bore diameter to see how worn it is? if it is in fact worn, glock should replace it under warranty.

 

[Zoogster]

I still load my hunting rounds that way (very hot), because I usually only shoot one round and its over.

Exactly.

I wouldn't say "exactly". The situation is slightly different.
With a hunting shot the intent is to down the animal humanely with a single well placed shot. Typically against a non-moving animal that allows more precision placement.



In self defense the animal is typically going to be moving, and probably closer.
You don't care about being humane, you want the animal stopped. You fire more than one round.
Two connecting rounds at 90% of the nuclear loading will be more effective than one. Several rounds even more in your favor.


One more thing to consider is the last place you want to have a kaboom is miles out in the middle of nowhere. Resulting injuries a hundred or more miles from the nearest hospital are a lot worse than for someone at a typical gun range. Even if you can manage to get a cell signal to call someone or have a sat phone you will likely have to hike to a flat clearing for a helicopter.
You may need to wrap up your injuries and hike significant distance with limited use of your hand. Smelling like blood with a sidearm that no longer works.
Like I posted previously a nuclear load is far more likely to kaboom if you have a small amount of something foreign in the barrel. Like snow, water, dirt, blood, muzzle touching animal, etc Things you are more likely to have in a gun in the wilderness than from a bench or stall at some range.

Another consideration is that the pressure of loads changes based on the outside temperature. The load you work up in cold weather that is nuclear but barely showing pressure signs can kaboom on a warmer day even in perfect conditions.
A big consideration in a climate that has such temperature variations.
Leaving some margin of error can prevent this.
100 FPS just isn't worth it, especially when you have over 15 rounds at your immediate disposal.

 

[agtman]

Man, that's a beautiful pic, Float Pilot.

If I could, I'd bring all my 10mms up there just to be able to shoot them in that scenic country.