Help! DoubleTap 10mm too big?!

[Kudlu]

Anybody here shoot DoubleTap 10mm? I tried a few boxes of 200 gr. Beartooth in my stock G20 and they worked fine.

But when I tried them with a Lone Wolf Distributors replacement barrel I had to whack the back of the slide hard to get them to chamber. (That only lasted for a few rounds before I gave up.)

So I took both barrels out and tried dropping rounds into the chamber. Both the DT Beartooth and Winchester Silvertip would drop into the chamber of the Glock barrel.

The Silvertip would drop into the LWD chamber, but the Beartooth would drop halfway in and stick pretty firm. I emailed LWD and they said their smaller chamber is by design. It's a good thing! But not for me.

So now I'm looking for a smaller (in diameter) heavy round for carry in the woods. Does anybody have some DT 200 gr. Beartooth rounds laying around that you can compare with others?

I'm looking at the DT 200 gr. FMJ and the 230 gr. Beartooth. Are they smaller in diameter?

Thanks a million if you can help. Well, thanks $80, which is what it would cost to buy a box of each to try them.



Kudlu

 

[Seven For Sure]

The 200 and 230 BT are the same. The 200 FMJ they sell will work in your new barrel. I had the same problem with the DT BT's in my S&W 610. I can't get the cylinder closed with them.

 

[Kudlu]

The 610 is a revolver, right? So you're saying that you can't push the Beartooth round all the way into the cylinder? That would seem analagous to my problem.

Well, you actually said that you can't get the cylinder closed, but I'm not sure what that means. (I've only shot a revolver twice in my life.)

Thanks!


Kudlu

 

[shooter1]

Sounds like out of spec ammo to me. The chambers of the LWB are cut to industry standards. Glock chambers are known for being on the generous side. I bet it's something to do with the profile of the Beartooth bullet, as they won't chamber in the gentlemen's 610. Get out the micrometer and caliper and check some of the rounds to find out. I have several LWB in my Glocks. They all work fine, if the ammo is in spec, and the barrel's chamber is clean, the round should drop in the chamber. If other commerically loaded ammo chambers and the DT doesn't, what does that tell you?
str1

 

[Kudlu]

Ammo specs and tolerances

"Sounds like out of spec ammo to me. The chambers of the LWB are cut to industry standards. ...if the ammo is in spec, and the barrel's chamber is clean, the round should drop in the chamber."

That's an interesting thought, but help me out here. Is there one defined spec for the size of a 10mm case (I know the bullets can have different shapes) that all makers try to adhere to, or is it accepted that there's a little variety among manufacturers, such as, "Nikes run a bit wit wide, but Reeboks are usally short"?

Put another way, is this an issue where if one box of ammo is out of spec, that's an obvious mistake that the manufacturer should admit and make right? Or might the maker of the cartridge legitimately say, "Yeah, ours run a little big for reasons x and y," like Glock makes their chambers a little big for their reasons.

I know there are some anti-DT sentiments around, but this isn't about that. My questions would apply to any manufacturer.


Thanks,


Kudlu


P.S. Oh yeah, and the barrel is clean.

 

[shooter1]

Is there one defined spec for the size of a 10mm case (I know the bullets can have different shapes)

Yes, there is an industry standard for this case. You reloading manual will have the drawing with specs for both the case, and loaded round. Or, you can find a drawing w/specs on the web.
To me, this would appear to be a problem with this loaded round in general, not just one out of spec box of ammo. (As two of you have the same problem) Measuring is the quickest way to identify the problem.
I wonder, have you ever had a factory round fail to chamber in your 610? I bet not! This alone makes the ammo suspect. If you measure the rounds. I would be interested in the dimensions.
str1

 

[Kudlu]

I'll measure rounds from a couple of boxes if I can borrow a micrometer from work.

I don't have a reloading manual. What does it say the case diameter is supposed to be?

Okay, so there's an industry spec for the diameter of a 10mm case (maybe it's supposed to be... 10mm?), but I'm still wondering how much lee-way manufacturers can take with it still considered acceptable. (See my examples of the LWD and glock barrel chambers and of different shoe companies.)

That's getting off the original topic, so maybe I should start another thread...


Thanks,


Kudlu

 

[Seven For Sure]

I'm not the only one to have had this problem with this ammo in a 610. The BT's come in .401, .402 and .402.5. I'm guessing they are one of the latter but a call to DT will confirm this. I have GLOCKS to shoot them in so I'm o.k. with it but it's kind of a bummer. 1-866-357-10MM

 

[shooter1]

The case dia for the 10mm is .423. It is a straight wall case so mic it in several places along the length of the case. I suspect there might be a bulge in the case where the base of the bullet is located causing your problem. I haven't had time to look for the chamber specs yet. I'll try to find that info and post it here. I just checked a factory Silvertip 10 mm, it measured .421. New Starline brass measures .419. A fired RP case mics out at .423. I resized the same RP case and it is now .418. I would guess that .423 is the max dia for the loaded round.
str1