Hi. A new Glock G29 owner here. I am interested in finding data on 10mm rounds run through the G29. Are there any rounds - handloads or factory - that will meet or exceed 550 ft/lbs. of energy measured @ 50 yards?

In particular, I am interested in 200 grain gold dots, Hornady XTP, or similar lead, copper jacked controlled expansion bullets...

I'd use the search function, but since this is my first post on the forum, I'm unable to (until post 10).

If anyone has the info, I would sure appreciate it.

Thanks,
Kegs

I dont' have a G29 or a Chrony, but I ran the calculations based on advertised MV and BC.

Double Tap 135 gr Nosler JHP leave the muzzle of a G20 with 767 ft-lb of energy, but by 50 yards have only about 525 left. The G29 will be a little worse, probably about 500.

The Hornady 200 Gr XTP will leave a G29 muzzle at 1195 fps, (based on Double Taps 200 gr Controlled Expansion JHP) for 634 ft-lb of energy. At 50 yards, it has slowed to 1080 fps, for 517 ft-lb of energy.

I don't think ANY factory loads are going to deliver 550 ft-lb of energy at 50 yards from a G29.

Where did you get the ballistic coefficient for the 200g XTP? I ran numbers earlier through Hornady's external ballistics computer and found I could get 542 ft./lbs. @ 50 yards using the XTP 200 grainer using that same speed figure.

I am thinking the answer here is simply an extended barrel that gives the gun G20 velocities, and thus increases the energy - but I do believe the way to get it is a heavier bullet - and 200 grains is about the right mass.

Ballistics Table in Yards
Glock G29 200 gr., .199 B.C. www.hornady.com
Range (yards) Muzzle 50 100 200 300 400 500
Velocity (fps) 1195 1105 1036 938 867 808 755
Energy (ft.-lb.) 634 542 477 391 334 290 253
Trajectory (100 yd. zero) -1.5 2.8 0.0 -30.6 -100.2 -214.9 -381.3
Come Up in MOA -1.5 -5.3 0.0 14.6 31.9 51.3 72.8

Yup, 542 - but this is based on advertised numbers.

Same BC. I used the ballistics program on my phone to run the calcs. I don't know which table of constants it uses, but obviously a more conservative one than Hornady's website.

The handloads.com website has a calculator that closely mimics the numbers you are getting from Hornady.

Keep in mind that I didn't change the temperature or RH figures that were on the program - but since they seemed pretty average (based on year round temperate climate), I'm not sure that they would be fairly realistic.

I also wonder about the constant. Based on what scientific research I've read on ballistics, your phone application may be taking into account a margin factor for real as opposed to "advertised" b.c.s.

However, this is pretty easy to sum up by using a chronometer and a ransom rest. Unfortunately, I have neither at my disposal.