Underwood 220gr Hardcast (New Load)

Intercooler · January 10 2014 03:01:57 PM MST

I saw that.

I have MT10mm's 220's here and plan to run a few Sunday. In the next shipment to The Shadow I will include one for pull-down.

Intercooler · January 10 2014 04:10:07 PM MST

Only 8 decent ones out of 21.

4949shooter · January 10 2014 04:19:56 PM MST

Quote from: MT10mm on January 09 2014 09:08:23 PM MST
UW has the 220 HC back in stock

I wonder if they are the old stuff or from the adjusted batch, if this was ever done.

Did Kevin ever get back to you when you sent him the Glocktalk thread?

Intercooler · January 10 2014 04:31:39 PM MST

Someone else sent him the link. This has to be the old batch as the new was just released a day or two ago.

mt10mm · January 10 2014 04:55:57 PM MST

It's an old batch and a hot one

mt10mm · January 10 2014 05:32:36 PM MST

Quote from: 4949shooter on January 10 2014 04:19:56 PM MST
Quote from: MT10mm on January 09 2014 09:08:23 PM MST
UW has the 220 HC back in stock

I wonder if they are the old stuff or from the adjusted batch, if this was ever done.

Did Kevin ever get back to you when you sent him the Glocktalk thread?

I sent Kevin the link but have not got a response.

The_Shadow · January 10 2014 06:28:33 PM MST

Quote from: Intercooler on January 10 2014 04:10:07 PM MST
Only 8 decent ones out of 21.

IC, did you shot those from your EAA? Smith? ${$default_shocked_smiley}$ ${$default_huh_smiley}$

Intercooler · January 10 2014 06:46:17 PM MST

Those are MT10mm's he shot out of the Glock with Lone Wolf. I will put a couple through my Limited and Hunter Sunday and post any ugly ones with measurements.

The_Shadow · January 10 2014 07:20:35 PM MST

Ok I didn't think your gun was letting that happen, I thing that Glock was unlocking and opening too soon.

4949shooter · January 10 2014 07:25:17 PM MST

Quote from: The_Shadow on January 10 2014 07:20:35 PM MST
Ok I didn't think your gun was letting that happen, I thing that Glock was unlocking and opening too soon.

Stock 17 pound spring?

mt10mm · January 10 2014 07:43:21 PM MST

I was using the stock RSA. I have purchased a lone wolf adapter/ss rod and 22lb spring to try with the UW 200 TMJ

The_Shadow · January 10 2014 07:50:54 PM MST

I could be wrong but I just don't think the stock RAS has enough spring tension at lock up to keep it locked up long enough, especially with high impulse ammo like Underwood. However these rounds may actually be too hot for all but the best chambers and guns to handle it. $:-\$

mt10mm · January 10 2014 09:57:57 PM MST

I switched back to the factory barrel and went to a 22lbs RSA. Going out tomorrow to try out some UW 200TMJ and DT 200cast

Yondering · January 10 2014 10:48:32 PM MST

Quote from: The_Shadow on January 10 2014 07:20:35 PM MST
Ok I didn't think your gun was letting that happen, I thing that Glock was unlocking and opening too soon.

Regardless whether it was unlocking too soon, any load that blows the primers out is WAY too hot. Early unlocking has nothing to do with that.

Aint no way I'd have kept shooting that in any gun of mine, except maybe one round at a time with no magazine in it (but why bother).

Geeman · January 11 2014 05:32:24 AM MST

It might be that the picture is tricking me, but the primers on the bad rounds appear flatter than the eight. That would be interesting. I might also be wrong, but I also think I see a smile line in the far right case of the 8 standing.

The load is too hot. If the glock is unlocking early, its doing it VERY consistently, as the cases seem to show the smile in the exact same location, case after case.

The primers popped out when he was shooting a tighter chamber (Lone Wolf), but stayed in with the factory barrel. Its just a pressure thing, too much of it for the gun. The Glock barrel might keep the primer in the case, but might cause a head separation earlier because of stretching the brass more.

Handloading solution would be simple. Just back down a half grain and keep alert for pressure signs. Credit Underwood for trying to stay at max performance, and also credit him for backing this one down just a bit. I'm just glad you didn't fire these on a 95 degree day when the rounds were in the sun for awhile before hand.

Greg