That is pretty high dollar

I like this one
https://www.youtube.com/watch?v=UO71TlsAKik

What are advantages and disadvantages between a Captive setup and a non captive setup?

Here is another pic of the barrel Hood,what in the heck could be causing the vertical scratches on the Hood ?
They were not there before firing the pistol

Thank you much

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I just got a Glock 21 Gen 4 and bought a Storm Lake 10 MM conversion barrel,6inches long.

Shot once out of my Truck today ,Just made sure the Muzzle was outside the cab.

I was using Underwood 180 XTP ammo.

Cases were ejecting upward and to the rear at about a 135 degree angle from the ejection port
and landed about 4-5 feet away although I do not know how high they went before landing on the ground.

With the shot that was fired with me sitting inside the truck and her sitting in the passenger side seat of the 2013 Dodge Ram quad cab the case hit her in forehead .

Rest of the shots(3 more) were obviously shot while I was standing outside the truck !

I Inspected the cases and found a scratch on the cases with what could be called a minor cut that I could barely catch a fingernail on at the top of the case mouths.
Also the case rims felt rough when rotated.
The primers were flattened and the primers on the 4 cases had a tiny amount of extrusion (again where a fingernail could barely catch the extrusion)and also showed the rectangle of the firing pin slot on the breechface.

I took the slide off and saw a tiny bit of battering of the frame(although I do not know how much is attributable to first firing or ?).


Is this normal?
Do I need a Heavier RSA?

If I do need a heavier RSA is there any issues with using this one https://www.ndzperformance.com/NDZ-22LB-Guide-Rod-BLK-Adapter-Gen-4-20-21-40-41-p/ndz-gra-g4-blk-g20-gl22.htm
or a ?

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Quote from: bcraig on September 18 2018 10:41:23 PM MDT

Quote from: Rojo27 on September 17 2018 10:33:06 PM MDT
Even with that one video (who knows what happened)....  There are tons & tons of videos and testimonials by independent people testing Underwood Ammo and by OVERWHELMING majority, people comment on the velocity meeting advertised fps.

I hope it is up to velocity as I just got 4 Boxes delivered today.
Here is another fairly recent Video giving velocity of the 180 Grain Load
https://youtu.be/KN4thm4J6ks

I contacted Underwood
   

Hi I just received the 4 boxes of 10mm 180 Grain XTP. Very fast shipping,Thank you. I have a few questions for you. I would like to know what Barrel Length was used to get the 1300 FPS Velocity ? Was a Factory Glock barrel used to obtain the velocity? I have seen Several Videos on youtube where this load was chronographed at around 1200 FPS. A couple of the videos and subsequent shooting of the ammo through a chronograph were Less than a Year old . They were using a Glock G20 with the Factory 4.5 inch barrel. What are your thoughts on these low velocity readings as compared to the advertised velocity of 1300 FPS ? Change in powder or powder charge that resulted in a lot of ammo that resulted in lower velocity ? Thank you for taking the time to read this and I am looking forward to your reply. Billy

Here is the Reply

Underwood Technicians <ammotechs@underwoodammo.com>
We use a 5" barrel to pull all of our 10mm velocities, which explains a large majority of velocity discrepancies as most assume we use a Glock barrel. Small yet compounding factors can change velocity +/- 50fps as well, so a Glock 20 averaging between 1200-1250fps is definitely normal and acceptable with a 180gr load.

Quote from: Rojo27 on September 17 2018 10:33:06 PM MDT
Even with that one video (who knows what happened)....  There are tons & tons of videos and testimonials by independent people testing Underwood Ammo and by OVERWHELMING majority, people comment on the velocity meeting advertised fps.

I hope it is up to velocity as I just got 4 Boxes delivered today.
Here is another fairly recent Video giving velocity of the 180 Grain Load
https://youtu.be/KN4thm4J6ks

Yes He did talk about setting up another chrony but even after he did this ,If I remember right he still only got about 1250 from the load.
and he did say he wondered if he got the chrony wet.

What Really got me to wondering was where he said that that was about as he expected with the 10mm Loads from Underwood,something to the effect of the other loads including 9mm always met the velocities but not the 10mm.
Then in the comments below there were a couple of guys that seemingly confirmed the 10mm ammo not meeting the velocities.

Maybe a bad batch of ammo,bad chronys,RSA ? I sure dont know !

Has anyone Velocity tested the Most recently produced Underwood 10mm ammo ?

Thanks for the welcome guys and thanks for the info.

This Video and comments is what was concerning me as to the velocity.
Maybe he just had a bad chrony ?
https://youtu.be/QhCUOEyz8Dc

I am new to the board and to 10mm and I have a Question  or 3 about the Underwood  10mm 180grain XTP Ammo

I Just bought a Glock 21 Gen 4  45ACP and also bought a Storm Lake 10mm 6inch barrel.

I would like to know what Kind of Velocity the Underwood 180 gr XTP ammo Actually gets ?I know it is rated to get 1300 but wondering if it really will do 1300? I do not have a Chrono But thought that Someone here might have Run the ammo through their Chrono recently?

Also do I need a different RSA than the Factory dual spring setup which I understand is 17 pound ?

I bought the Pistol for self defense and whitetail deer hunting at ranges of 50 yards and less.