10mm-Auto

Other Ammunition Calibers => Reloading => Topic started by: wadcutter on April 10 2014 01:48:01 PM MDT

Title: has anyone tried to duplicate underwood ammo?
Post by: wadcutter on April 10 2014 01:48:01 PM MDT
I've been reading a lot of the pulldown results of Underwood's 10mm ammo and the components are nothing the average reloader can't find. Has anyone tried to duplicate these loads? If so did you chrono them and what were your results?
Title: Re: has anyone tried to duplicate underwood ammo?
Post by: The_Shadow on April 10 2014 08:08:29 PM MDT
I have duplicate a few of the 10mm with IMR800x and LongShot and 9mm rounds with AutoComp, Some of these others I haven't played with as much, but the 44 and 357 using H-110 or 296 are fairly straight forward book loads at Hodgdon and even LilGun loads are very close to book loads with some being over. 

While the "Pull-Downs" are meant as a reference of what was found, I would still work up from the book data and if you are using different components (bullet, primers, brass, etc.)things will probably need to also change. ::)
Title: Re: has anyone tried to duplicate underwood ammo?
Post by: Geeman on April 11 2014 09:10:09 PM MDT
With much appreciation of Shadow's, Intercooler's, Raggedyman's work and Grim Reapers providing a home for it all, I use these results as an additional resource to load the 10mm. 

I especially like the old 800x loadings for the discontinued factory loadings as they seem to make for the most potent, safe loadings I've put through my guns.  Start lower!!!!   Work up to those loads.  800x is for weighed charges only, but it does seem to get the most out of the 10mm.

Greg
Title: Re: has anyone tried to duplicate underwood ammo?
Post by: Raggedyman on May 09 2014 11:13:03 AM MDT
I agree with the 800X. I actually stop a little short of Underwood for my town and woods defense loads. I think Underwood pushes the projectiles way beyond their design limits.
Title: Re: has anyone tried to duplicate underwood ammo?
Post by: denclaste on May 09 2014 10:59:18 PM MDT
I have to agree with Raggedyman. There seems to be a point of very rapidly diminishing returns that is reached with some of Underwoods loadings. Unless the projectile is specifically designed for those velocities you can run into integrity problems that aren't seen at 100 fps slower velocities. If the bullet wasn't designed to use at those speeds, what have you gained?
Title: Re: has anyone tried to duplicate underwood ammo?
Post by: Intercooler on May 10 2014 09:22:31 AM MDT
  Utter and total devastation  ;D
Title: Re: has anyone tried to duplicate underwood ammo?
Post by: nickE10mm on June 15 2014 08:32:10 AM MDT
Quote from: wadcutter on April 10 2014 01:48:01 PM MDT
I've been reading a lot of the pulldown results of Underwood's 10mm ammo and the components are nothing the average reloader can't find. Has anyone tried to duplicate these loads? If so did you chrono them and what were your results?

Yes.  :)  (Many of us have been there, done that, years ago.) 

Most of us have found loads we are most comfortable for our intended use and observed performance and accuracy that may, or may not, equal the velocity Underwood ammo attains.