Originally Posted by bigred94
does anyone have any real numbers on the 10mm with the factory 3.78" barrel (G29) vs the 4.60" barrel G20). I have a 29 and was thinking about selling to the get a 20 to get the full power of the 10mm if there is a big difference between the barrel lengths.
Several of the ammo-makers catering to 10mm-fans have posted their own chronograph numbers for their ammo as fired in real-world guns having different barrel lengths. These include the 5" Delta, 4.6" G20 and 3.8" G29.
DT started doing this a while back, and on one of the 10Ring stickies I thought Mike had posted the fps/fpe stats for DT's 10mm loads (those avaible at that time), chronographed from the G20 & G29. BB does this also for their 10mm ammo, and the fps/fpe stats out of the guns that BB uses can be found on Midway's site.
From the DT site:
"Caliber : 10mm
Bullet : 230gr Wide Flat Nose Gas Check Hardcast
Ballistics : 1120fps/ 641 ft./lbs. - Glock 20
1008fps / 519 ft lbs 100yds Glock 20
Glock 29 - 1075fps
Box of 50rds
For what it's worth from my experience, the heavier
10mm bullets, when fired at real 10mm velocites (i.e., the full-throttle stuff) seem to lose relatively less
velocity from the shorter
barrels than do the lighter-weight bullets. Ballistic experts can probably tell you why that is, but over time I've seen this phenonmena re-appear in the chrono data.
My preference in bullet-weight for the 10mm AUTO is old school, which is to say "heavy." I've been with this round since the late 1980s and so I prefer the 180gn+ bullets, and when you can find them the 200gn slugs. The original concept of 200gns @ 1200fps defined "heavy & fast," as between the 9mm (light & fast) and the .45acp (heavy & slow), which were the only other practical choices you had in an autoloader back in the day.
Two years ago I bought 1500 of Hornady's 200gn FMJ-FP bullets, so I got well-stocked there. I also really liked Speer's 190gn truncated FP bullet for reloading and training purposes (loaded to 1200+fps), but it was discontinued in favor of a 180gn FMJ. I picked up some of those, and I also liked the box of 500 Berry's 180gn bullets I got at Cabela's. But that all got loaded up and shot a while back.
I've also stocked up on - because the were available a few years back at a reasonable price - 1000 Remington 165gn FMJ bullets. Those I still have. But I'd buy another 1500 of Hornady's 200-grainers in a mil-a-sec if I could find them.