Underwood 220 gr hardcast
 

I'd been waiting for this....although I'm not sure I thought I would see a 220 grain....velocity seems outstanding....hmmmm....

I was hoping for and suggested a 200gr WFNGC. The reasons being, one still gets good penetration, but more importantly, allows a standard Glock barrel rifling to stabilize the bullet.

Too heavy and this happens ( hickok45's video) :

The standard Glock rifling is fine for heavy bullets. It's the poor fit and crappy tolerances of that 230gr bullet that Double Tap uses that's the problem. The same is true for any cast bullet, they just usually aren't that bad.

Gosh darn it! Now I've gotta save up for some 220 hardcast. Oh well i guess the 200 xtps, 135 noslers, and 165 gold dots will tide me over for now lol.

This is exciting ammo for the hunting 10mm enthusiasts.

The video is a good ole boy evaluation but cinder blocks are just too tough to cook. Even slow cooking doesn't tenderize them!

Using a G20, KKM 6" barrel, would the 220gr HC Underwood require more than the stock spring?

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Require--no. Might eject better.

What weight spring should I use with this ammo?

Very cool :cool:

10mm is an awesome round.

Great video as usual from Hickok45.

However, someone needs to tell him that there's a big difference between hot 10mm and hot 44mag.

Same here. That said, I'm pretty impressed with the 200gr TMJ Speer rounds. They seem to hold together very well.

IMO, you should use the same spring weight you use for any other hot 10mm round.

Per an email I got from Underwood, all bullets stabilized perfectly through a stock barrel. Even so, do you guys think I could expect leading since the bullets are not gas-checked?

Great forums btw. Glad to finally be part of it!

these bullets are gas checked.

I just need a starting point on spring weight. This is my first venture into hotter loaded 10mm until I start reloading.

I had assumed they were, but the email I received from Kevin at Underwood specifically stated that the bullets are NOT gas checked. That's what lead me to post the question about leading in the stock barrel.

Just shoot it with the stock spring weight and see if you feel that it is problematic. At that point you might boost spring weights if you find a specific reason, but it is totally not a requirement.

The only time my gun has failed (other than due to worn parts) is when I switched to a 22# spring. The stock spring is 100% with whatever loads I run. I replace it every 3000 rounds.

I run an ISMI 22lb spring on my G20, and it's never failed me once, even with .40sw tulammo. I wish I had gotten the 24lb ISMI spring tho, 22lb wasnt enough for my gun with hotter ammo, it would still sling brass fifteen or twenty feet.

Like tater said, it isnt a necessity, shooting with the stock spring is perfectly fine. Personally, I do recommend a heavier spring if youre going to be shooting a lot of hot stuff, just to keep the battering down on your gun, but that's just me.

Every bit of research ive done indicates that so long as you check your barrel every fifty rounds, and clean it when necessary, you will be fine...

This is exactly what i've been waiting for. Although i kind of expected a 200 grain bullet. The 220 is fine with me if it works well. That is interesting if it is truly not gas checked. Any idea when it can be ordered, or has anyone recieved any yet and shot it?

I sent Underwood an email last night after my post. Here is the reply i got early this morning.

My question is on item number 242. Is the hard cast bullet gas checked?
No, it is not.
If you have any other questions or need anything else, please let me know.
Thanks, Kevin

Merely guessing here, but they may be SNS casting hardcast 220gr. bullets. I have a number of these but I've never shot any out of the stock bbl and they're not gas checked either. I can't imagine they would lead terribly, but would expect them to lead some.

St
 

Underwoods TMJ 200 and 220 Hardcast are both "out of stock" :faint: I'll hold out for re-supply instead of buying DT's overpriced/underpowered offering. Until then my best bear round is the Underwood XTP sadly.

Handloading and casting are insurances to eliminate short falls and allows you to produce custom premium quality ammo and some savings over the long haul.
Good luck!

Underwood uses a 24# spring...he told me. He shoots hot all the time, so I'd imagine. I use a 22# SS rod/spring. Works great in both worlds.
Enjoy!