10mm powder/power help

[johncmng]

I am new to reloading and need some help. I own a Glock 20C and the ports on the barrel may decrease the velocity of the bullet. Is it safe to pack in more powder to compensate the drop in velocity? There's no way for me to measure the pressure, but, I can measure the speed. Do I just add more powder until I reached the maximum velocity of the bullet? About 1300 ft/sec is what I am looking for?

[Bill Steele]

Short answer is no.

I would recommend going over to the Glock Talk forums and check out the club section where there is a 10mm loading forum. The experts there will get you totally dialed on loading your 20C to get its maximum performance.

[DRAB_81]

I agree with Bill. More powder isn't often the answer, especially if it means going over max published data (which I admit I've done, but don't recommend). You chose the "C" model, and you have to accept the limitations that come with it. If you're really worried about it, buy a stock non-"C" barrel, and run that in your gun. Also, check out the 10mm reloading forum on GT, I got most of my 10mm loading education there.

http://glocktalk.com/forums/forumdisplay.php?f=67

Have you chrono'd any 10mm loads through your gun & a standard G20 to see if there is a significant decrease in velocity? I haven't, but I'd be willing to bet its less than a 10fps difference with the same load. I'd be just as happy at 1290fps, as I would be at 1300fps. Again, that's just an estimate of the difference, I have never chrono'd a "C" barrel.

What bullet(s) are you using?
What powder?
What primers?
What OAL?
What barrel?

To get to 1300fps with 180's in a stock length G20 barrel is not the easiest thing to do, although not impossible. To get 1300 with the 165's & lighter is pretty easy, and within published data.


.

[Bryan16]

I think the other guys covered it. But just remember you will find that a powder manufacturer and a bullet manufacturer will usually be quite different on their book data. I really like the Hornady book data. Better yet, I recommend buying the Loadbooks guide here:

http://www.loadbooks.com/

It has every powder and bullet manufacturer data compiled into one guide. You can also find it on Ebay:

http://www.ebay.com/itm/Reloading-Manual-for-the-10mm-40-S-W-LOADBOOKS-USA-10mm-40-S-W-/270954164959?pt=LH_DefaultDomain_0&hash=item3f162072df