Any recent update on the Grand Power in 10MM?

[Intercooler]

Are those velocities out of the GP? Any brass measurements or video?

[PCFlorida]

Yes, those are chrono readings out of the Grand Power. How should I measure the brass? I saved it just wasn't sure where to take the measurements. To be honest the brass looks really good.

[Intercooler]

I figured it would look really good. Here is where to measure:




Is that 1270 FPS with a 200gr bullet? That's 715 lbs at the muzzle. Really good!

[Intercooler]

Are you still running the stock "red" spring? I can give you measurements if you want to step to a 20lb or higher CZ-75 spring. That might reduce the throw even more!

[Intercooler]

The stock CZ recoil spring measured ~ 4.865" and I had to whittle it down a coil or two at a time. When I could finally get the slide on it was about identical in length to the stock GP spring in length. The cut spring is 3.935" and the GP spring measures 3.900"

[PCFlorida]

I figured it would look really good. Here is where to measure:




Is that 1270 FPS with a 200gr bullet? That's 715 lbs at the muzzle. Really good!

I figured that was where to measure so I took those already. On all 5 rounds it was .422 before and .424 - .425 after firing. The Glock was .428 after firing and clocked 1281.

That is 1270 FPS with a 200 gr Hornady XTP. I picked a thousand of them up on sale last month. I'm really happy with this gun. The felt recoil is much lower and there isn't as much muzzle flip.

[PCFlorida]

Are you still running the stock "red" spring? I can give you measurements if you want to step to a 20lb or higher CZ-75 spring. That might reduce the throw even more!

Yes, still running everything stock until I shoot it some more. Right now I'm amazed. What is the stock spring, do you know?

[SavageOne]

According to the guys in Slovakia, it's comes stock with a 6.5kg spring which converts to 14.33#. Seems like there would be plenty of room for increasing spring weight.

[PCFlorida]

So I believe that what we know about recoil springs may not apply to the rotating barrel. A 14 lb spring isn't nearly enough in a short recoil design, but may be plenty in a rotating barrel. The gun doesn't recoil that hard at all. I will try to get some video but may need to wait a week. We will see.

[Intercooler]

I had to go down in my 9mm on the spring weight (hence the cut-down). The red spring seemed too strong IMO for even +P. I think I went with a 10lb spring which is what I run in my EAA Limited 9mm even with +P+. I'm pretty sure the red spring feels stronger than what whey rate it. You might be good to go across the board with it... however... swapping to a Wolff spring you will know exactly where you are at and what works.

[PCFlorida]

I'm sure to swap it at some point, it is running really well right now with no defects out of the box. No FTF or FTE, it just runs. Like a Glock

[Intercooler]

 I doubt any frame battering, so I would just leave it too. How was the accuracy? My K100 shoots like a Witness when I do my part.

[Intercooler]

Interesting!

[PCFlorida]

I doubt any frame battering, so I would just leave it too. How was the accuracy? My K100 shoots like a Witness when I do my part.

The accuracy is great

I need to get a couple hundred of the 200 XTP's loaded up. I think I am staying right there at 12.5 . Very consistent.

[PCFlorida]

Interesting!

Nice.