FEDERAL 180gr Trophy Bonded JSP

[dred]

Given what has been deduced about how it was loaded - can we reverse engineer a reasonable explanation? I'm going to bet that this "hunting" round will make good use of at least 6" of barrel.

Hmm kay ... got me curious.  Time to pack the Mechy, the Silverback, the Chrony and some Trophy Bonded out to the range.  I'm curious how much charge is going unburned and more barrel is the best way I know to find out.

Who knew it would take me this long to get the kit to the range?

But,

Trophy bonded in the Mechy:  https://docs.google.com/spreadsheets/d/1Q9QryFLJ0Zy1yMsBcWol4oytStypnmaYzM7hch2O5eI/edit#gid=1873872204

Trophy bonded in the Silverback:
https://docs.google.com/spreadsheets/d/1uvAPG3I9lAqp_xQa3iS8JUNFk9RDq5FnpsEs-sX3g2E/edit#gid=1844500006

Muzzle velocities:  1287 fps in the 5"; 1608 fps  in the 16".

Out of the Mechy, she's still delivering 1000 lb.ft at 15 yards.

[RDub01]

Hey Dred
Your links require permission..  But anyway sounds like more barrel is the ticket with this round..  Thanks for the report

[dred]

Hey Dred
Your links require permission..  But anyway sounds like more barrel is the ticket with this round..  Thanks for the report

Links fixed.

[Pumpkinheaver]

Interesting expansion on that bullet. There used to be 296/110 data years ago. I don't think it worked very well thus it is not published any longer.

[RDub01]

I have a PDF of an old Winchester #15 reloading pamphlet, and while browsing through it looking for something else, I discovered a listing for 296 and 180gr and heavier jacketed bullets.  The pressure is held down quite a bit at 22,200 psi as opposed to pressures of everything else at 35K..
Knowing what I do about 296, I have a hard time believing this load would work very well at that pressure..  Why wouldn't Winchester load this up to 35K?
Interesting..

[Ridgerunner665]

Not enough room in the case I suspect.

I do wonder what it would do with a magnum primer though.

I have 296 and magnum primers, and you just gave me the rest of what I needed to find out (load data).

[The_Shadow]

RDub01, I have that pamphlet and PDF for Winchester 15 as well, It needs to be tested at higher levels to get it to burn better in my opinion.  I wonder if they were showing this data for ammo developed for longer barreled things like the MP-5 10mm as tested in handgun barrel lengths?

By the way here is the warning for the * shown for 296 in that publication...

*Note: 296 powder is considered to be one of the best powders for use in magnum revolver cartridges. Recommended for these loads are the use of a Winchester or Winchester magnum primer and a very heavy crimp (high bullet pull).
Failure to follow this procedure could result in poor ignition and/or squib loads under extreme circumstances, particularly in loads where less than 90% of the available powder space is being used (low loading density).
Do not reduce powder charges with 296 powder. Any further reduction in powder charge or change in components can cause dangerous pressures.

The possibility of squib does exist as as the primer can push the entire powder charge and bullet before ignition happens.
One thing that could solve this for 10mm is using a sealant to help secure the bullet because of the lack of crimp.  We have seen sealants used on defensive and law enforcement ammo by some companies...

[RDub01]

Yep, that *'See note above' means that a magnum primer is required..

And all that Winchester rhetoric about reduced loads..  What the heck is 12.6 grains at 22,400 psi???

That is lower than most of the staring loads listed..  Interesting..

As I mentioned before, 16.0 grains of 296 'will' fit in a 10mm case with just enough room for a short 180 FMJ bullet.  So.. who has an extra gun they don't care about.. LOL

[Intercooler]

So this box had more powder than the one I had. Anyone care to get another new box and see? Nothing on the powder yet??