Underwood 220gr Hardcast (New Load)

[Intercooler]

  I looked at the sheet and the BB 220 gave 1100 FPS average. That's pretty short of the 1200 FPS rating BB placed on the box. Kevin's old 800-X loading might have been better for pressure and I wonder if these would be workable scaled back to 1175? They averaged 1239 for me and that's pretty smoking!

[AmmoTest]

the lwd barrel has a tight chamber that lacks support. There is no where for the pressure to flow the brass outward except at the bottom of the case where the barrel lacks support. Hence the smiles on his brass.

Get yourself a full supported barrel like bar-sto, kkm, storm lake.

Note: I have several older lwd 10mm and 40sw barrels that DO have full support but some of the new ones coming out have the feedramps hogged out like a glock but kept the tight chamber (unlike loose glock chamber - which would allow the pressure to flow outward more evenly over the entire surface area of the case)

[Intercooler]

Kevin is out of the 220's and will back off on the next batch. The LW barrel also supposedly has an issue at the ramp.

[mt10mm]

Great news!  Will try some of the milder loads and see what happens.

[BillC]

My lone wolf bbl seems to have the same lack of support as my Glock factory bbl, and I have had alot of brass look just like the pic posted with bulges, I thought those were considered "Glock Smiles" and normal? I havent had any popped primers.

[4949shooter]

I am ordering a Lone Wolf barrel. I am considering having them ream the chamber and hand pick a barrel with more support.

[mt10mm]

What it Sounds like to me is all the newer produced LW barrels do not have full support as they once did. I  going to but a KKM barrel or other fully supported barrel.  IC and I traded ammo, he now will have the last 29rds of the 220gr UW cast. I bet if we ask nice we could get him to pull one apart to reference charge used. I would have but do not reload and don't have the right tools.

[4949shooter]

Does the KKM barrel require fitting?

Hopefully it is "drop in."

Edit...I see KKM doesn't offer a tactical length barrel. Too bad..

[mt10mm]

Barsto is what a gunsmith friend of mine told be to buy but they need to be fitted
LW barrels do have a lot of options but for the price after the additional 30.00 to open the chamber it may not be worth it.

[4949shooter]

You might be right about that. I like the Tactical length though, so I might give it a try. Buffalo Bore seems to be okay, so if Kevin cuts his load back to 1150 or so I might be good to go. I really can't see needing more than 220 grain hardcast at 1100 or 1150 for my purposes, which are back up as a woods gun while coyote hunting at night.

That will still ruin a bruin's day.   

[mt10mm]

You might be right about that. I like the Tactical length though, so I might give it a try. Buffalo Bore seems to be okay, so if Kevin cuts his load back to 1150 or so I might be good to go. I really can't see needing more than 220 grain hardcast at 1100 or 1150 for my purposes, which are back up as a woods gun while coyote hunting at night.

That will still ruin a bruin's day.   

I am going to order the KKM and see how it does. I ordered 3 boxes of UW 200 TMJ for my woods carry till he gets the 220 cast load reduced.

[4949shooter]

You might be right about that. I like the Tactical length though, so I might give it a try. Buffalo Bore seems to be okay, so if Kevin cuts his load back to 1150 or so I might be good to go. I really can't see needing more than 220 grain hardcast at 1100 or 1150 for my purposes, which are back up as a woods gun while coyote hunting at night.

That will still ruin a bruin's day.   

I am going to order the KKM and see how it does. I ordered 3 boxes of UW 200 TMJ for my woods carry till he gets the 220 cast load reduced.

Sounds good! Hopefully you will like the KKM.

[The_Shadow]

What it Sounds like to me is all the newer produced LW barrels do not have full support as they once did. I  going to but a KKM barrel or other fully supported barrel.  IC and I traded ammo, he now will have the last 29rds of the 220gr UW cast. I bet if we ask nice we could get him to pull one apart to reference charge used. I would have but do not reload and don't have the right tools.

IC may send one to me to pull-down, to verify what's being used, but the last two I pulled were the same...

Older Underwood 220gr Hard Cast http://10mm-firearms.com/factory-10mm-ammo-pull-downs/underwood's-lineup-135155165180220/ you have to scrool down some to see the 220 info.
Powder Description/Positive ID/Type/Charge Weight: IMR800X 8.4 grains Tested Velocity: 1209 fps from the S&W 1006
After the Shot Case Data: expansion measurement's: Diameter 0.4285"  primer moderately flat, failed to eject, leaving the brass in the chamber.  The expansion was such that it held the brass and the extractor pulled off leaving the casing.

One of the Newest Underwood 220gr Cast WFN http://10mm-firearms.com/factory-10mm-ammo-pull-downs/underwood-220gr-cast-wfn-1230-fps-pull-down/
Powder Description/Positive ID/Type/Charge Weight: LongShot  8.4 grains, haven't shot it yet.

I would suspect yours to be from this newer batch with LongShot powder...

[BillC]

Got my LW bbl about 2 years ago, I was getting FTF with UW 180's until I polished the feed ramp, chamber and finally I took some emery cloth on the top of the bbl where it seemed to be hanging up against the bbl hole in the slide. No problems since, but the lack of support keeps me from buying another LW, looks like I will look into another bbl.

[Intercooler]

I will send one of the 29 down for a pull-down.