Loading for a Glock G40

[Ridgerunner665]

The goal is a 200 grain XTP at a good honest 1,200 fps average...doesn't matter if its 1,201 or 2,251 fps, as long as it averages over 1,200.

I fired these rounds a couple weeks ago...the Federal primers were some strays I found laying around, the only large pistol primers I had at the time...I prefer CCI.

Chrono data - stock 6" barrel.

200 grain XTP bullet
7 grains of Longshot
Federal 150 primers
~1.26" oal
1,080 fps...ES was pretty bad (35 fps)

200 grain XTP
8 grains of Longshot
Federal 150 primers
~1.26" oal
1,190 fps...ES was pretty good (6 fps)



For tomorrow, I have some loaded with:

200 grain XTP
8.2 grains of Longshot
CCI 300 primers
~1.26" oal

I'm expecting that to get me well enough above 1,200 fps, probably 1,215 fps or so...we shall see tomorrow.

[The_Shadow]

I run 9.2 grains of LongShot for 1225- 1240 fps from the S&W1006 and Glock 20 from the Glock 29 they are 1190-1200 fps

[Ridgerunner665]

I run 9.2 grains of LongShot for 1225- 1240 fps from the S&W1006 and Glock 20 from the Glock 29 they are 1190-1200 fps

180 grain bullets?

[Ridgerunner665]

The rounds averaged 1,206 fps....ES was 18, SD was 6.

But, most of the brass has a faint "Glock smile".

[The_Shadow]

I run 9.2 grains of LongShot for 1225- 1240 fps from the S&W1006 and Glock 20 from the Glock 29 they are 1190-1200 fps

180 grain bullets?

200 grain XTP's but my guns have extra power non captive recoil springs, 1006 and G-20 with 22 lbs and the G-29 having 21 lbs

[Ridgerunner665]

I looked into extra power springs, but the G40 slide is 5 oz. heavier than the G20 slide.

That is alot, as slide weight goes,   I figured that would be good enough with the stock spring.

Case support.... The stock barrel has decent support but I've learned something this morning.

All these pics you see online showing case support for various barrels are done wrong.... They are all taken with the round crammed down in there as far as it will go, but that isn't where the round sits during firing.

The round sits against the breech face, flush with the top of the barrel hood... In my stock G40 barrel, that reduces the case support by a fair amount.

That method of checking case support will be the same for all makes of barrels... I'd be curious to find out the measurements from other barrels.

[Ridgerunner665]

Case support illustrated with the slide/barrel locked up as the should be...

[Ridgerunner665]

Shown the other way...

[The_Shadow]

Starline brass is softer than most, especially on the first or second firing, it gets stiffer as it is reused.  Give that thing a good cleaning, especially in and around the extractor, breech face.

Being you have the longer barrel you may see more pressure longer over the pressure curve.  My measurement with the non captive vs. the captive has shown a measurable difference...Yes it makes it a little tougher to rack the slide, but it hold in battery a little longer as well.  My Glock 20 is an SF and the G-29 is pre SF.

[Ridgerunner665]

Its brand new, about 20 rounds fired... I'll clean it after some break in.

I've loaded 10 rounds at 8.1 grains of Longshot... The Hodgden data was shot with a bullet that is a few thousandths shorter than the 200 XTP.

I'm thinking 8.1 grains is about all she wants under the 200 XTP without getting overly happy about it, lol.

Back down the hill to see what happens with these...

[Ridgerunner665]

Still smiles, just under 1,200 fps...

[Ridgerunner665]

On my way to the gun shop for some Accurate #9.

[BillinOregon]

Watching this thread closely.

[Pablo]

On my way to the gun shop for some Accurate #9.

Score? 

[Ridgerunner665]

Success....

12.5 grains of #9 gave 1,210 fps with absolutely no signs of pressure at all.... None.

Even the normal "Glock bulge" is less with #9.

I'm gonna try 13 grains later today just because Hornady says I can, and the brass appears to agree.