Cartridge is from Ammo Manufacture: Underwood 220gr Hi-Tek Coated Hard Cast FN (Redline 8/19)
Ballistics Information: 10mm Auto
Muzzle Velocity: 1200 fps
Muzzle Energy: 704 ft. lbs
Brass Make/Headstamp: Starline - Nickel
Bullet Make/Weight/Construction/Info; Length 0.7270"/Dia. 0.4005": 220gr. Hard Cast FN
MEPLAT 0.3000" / Flat Base
Actual weight 214.6 / 214.2 / 213.8 grains   Crimp squeezed bullet to 0.3990"
C.O.A.L.: 1.2445" / 1.2420" / 1.2430"
Primer: Large Pistol Primer Nickel color
Case: Diameter 0.4215" Crimp Diameter 0.4220" (Tight) Length 0.9870"
Powder Description/Positive ID/Type/Charge Weight: BE-86 8.0 / 8.0 / 8.0 grains (Changed originally posted this as Power Pistol)
Cartridge weight: 298.8 / 297.6 / 298.4



















Changed this to Power Pistol instead of BE-86, it may be possible that this may be power pistol with a flash suppressant added...

Interesting, the bullets coming in under 215 grains. I wonder if the would be around 210 grains if not powder coated. Definitely not 220 grain bullets. I can see were some would consider that as marginal, but to me it makes a difference.

The use of BE-86 is a surprise to me.

There are some translucent /off color flakes in the powder, I don't see that in my Power Pistol powder but it could be something added.  However BE-86 does have some translucent and off color flakes (in my 8 lb jug some are even a rust color) don't see that in this powder.  I will say that I tested 8.4 grains of BE-86 under the New Speer 200 grain Gold Dot and saw 1231 fps & 1227 fps.
When I tested 8.0 grains of Power Pistol with the 200 gr. Hornady XTP it was 1170 - 1200 fps...

The_Shadow,

What gun/barrel length did you use for the velocities you quoted?

5" S&W 1006 for both test

NOTE: Changed this to Power Pistol instead of BE-86, it may be possible that this may be power pistol with a flash suppressant added...
I think that this may be BE-86 and not Power Pistol...I'd have to test to see...

Kinda shocked to see Underwood move to power pistol, one way to tell for sure, do some night shooting, if you're blinded for a few minutes, power pistol! LOL

This may be BE-86 and not Power Pistol seeing the off color translucent flake in the mix...

Has anyone reached out to Underwood and asked them why they are not calling them 215gr hardcast?

The_Shadow has posted a generous amount of data showing the 200gr XTP to be about 201gr (which is fine with me rounding it off that close) so I have a hard time believing they are loading 220gr. Technically that's about 2.3% off so ... not HUGE but would seem better to market it as 215.

When I order some more later this month I can weigh them myself and post here.

I cannot speak for Underwood but it is generally true that the marketed bullet weight is much like the marketed horsepower of a car engine.  All the more so for cast bullets since different alloys weigh in differently in the same mould.  Chances are Underwood has more than one source for their cast bullets so they take "best case" with bullet weight and go on with life.  Nothing dishonest.  Just life as usual with bullet alloys.

Interesting! That's why it's nice to do the pull-downs... many things found over the years!

Ah, yeah that makes sense. 215gr is still pretty heavy. I just ordered some to test

Quote from: REDLINE on August 14 2019 01:33:27 PM MDT
Interesting, the bullets coming in under 215 grains. I wonder if the would be around 210 grains if not powder coated. Definitely not 220 grain bullets. I can see were some would consider that as marginal, but to me it makes a difference.

Coating adds an insignificant amount of weight. Far less than a grain.

Just posting to get that Chrome/Firefox crap off the front page. Please cary on.

Quote from: Bluebird5000 on September 26 2019 10:02:15 PM MDT
Has anyone reached out to Underwood and asked them why they are not calling them 215gr hardcast?

The_Shadow has posted a generous amount of data showing the 200gr XTP to be about 201gr (which is fine with me rounding it off that close) so I have a hard time believing they are loading 220gr. Technically that's about 2.3% off so ... not HUGE but would seem better to market it as 215.

When I order some more later this month I can weigh them myself and post here.

RIGHT......a good ways off to be considered a 220 grainer.