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bonanza
.400 member


Reged: 17/05/04
Posts: 2335
Loc: South Carolina
A. Hollis 500/450 first range report
      #49328 - 07/02/06 01:38 AM

I finally got to shoot the A. Hollis 500/450 hammergun this weekend. Here is what happened with Hawk 480 grain bullets and 85 grains of R15.

1: Thankfully it did not blow-up or exhibit any dangerous flaws.

2: Fire formed the cases to a different shape, go figure.

3: Stretched the base of the case quite a bit (head space)

4: Got stuck case every time. I had to tap them out with a cleaning rod.

What could be possibly causing the stuck case?

Don’t ask me how it shot – I just closed my eyes and yanked the trigger!



--------------------


"Speak Precisely" G. Gordon Liddy.

"Life is absurd, chaotic and we must define its purpose with our actions" Abert Camus

"I''m the dude playing a dude disguised as another dude."

"Yo! Mr. White"

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500grains
.416 member


Reged: 16/02/04
Posts: 4732
Loc: Salt Lake City, Utah USA
Re: A. Hollis 500/450 first range report [Re: bonanza]
      #49364 - 07/02/06 10:03 AM

Another fellow who suffered stuck cases learned that it was a bulged chamber causing the problem. It is also possible that your brass is out of spec. Finally, some of us have noticed pressure spikes with Hawk bullets. Try some Woodlighs and see if the stuck cases go away. If not, measure your cases with a micrometer before and after firing to see if they are expanding excessively in any location.

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bonanza
.400 member


Reged: 17/05/04
Posts: 2335
Loc: South Carolina
Re: A. Hollis 500/450 first range report [Re: 500grains]
      #49414 - 07/02/06 02:51 PM

I have some 350gr North Fork on the way, I planed on shooting those next.

--------------------


"Speak Precisely" G. Gordon Liddy.

"Life is absurd, chaotic and we must define its purpose with our actions" Abert Camus

"I''m the dude playing a dude disguised as another dude."

"Yo! Mr. White"

Post Extras: Print Post   Remind Me!   Notify Moderator  
400NitroExpress
.400 member


Reged: 26/11/03
Posts: 1154
Loc: Lone Star State
Re: A. Hollis 500/450 first range report [Re: bonanza]
      #49424 - 07/02/06 04:27 PM

From what you're describing, I assume that you're able to get the gun open, but the cases are still stuck in the chambers? Hmm. The .500/.450 has a base diameter of about .573" and a shoulder diameter of about .530" - a lot of body taper. When the gun opens, primary extraction occurs as the extractors lift the cases roughly 3/8" out of the chambers. At that stage, due to the body taper, it's impossible for the cases not to fall out of the gun via gravity alone - unless the chambers are severely out of spec. A chamber ring in the neck area comes to mind. Which way is the stretching? How do the dimensions of the fire-formed case compare to max cartridge? Time for chamber casts.

Like Dan said, take case measurements before and after firing.

The Hawk is a very soft bullet and obturates readily. Consequently, it is "sticky" and very often requires less powder to achieve the same velocity than other bullets of the same weight. In one of my rifles, I have to reduce the charge of my standard RL 15/Woodleigh load by 3 or 4 grains for Hawks of the same weight. Use Woodleigh for initial load development. Once you have a load developed for the Woodleigh, reduce the charge 5 grains for the Hawk and work back up.

Why did you start with a +max charge of 85 grains RL 15? For a 70 Cordite gun, rough max would be 83.3 grains (70 Cordite X 119%), and that assumes a Woodleigh, not a Hawk. You should have started at 79 or so with Woodleighs, 75 or so with Hawks.
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"Serious rifles have two barrels, everything else just burns gunpowder."

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NE450No2
.375 member


Reged: 10/01/03
Posts: 942
Re: A. Hollis 500/450 first range report [Re: 400NitroExpress]
      #49425 - 07/02/06 05:05 PM

400Nitro is correct. Drop your powder charge and work up.

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bonanza
.400 member


Reged: 17/05/04
Posts: 2335
Loc: South Carolina
Re: A. Hollis 500/450 first range report [Re: NE450No2]
      #49443 - 08/02/06 01:00 AM

Thanks mates,

Graeme Wrights "standard" load for this cartridge is 89gr of R15 so, I though I had reduced it, apparently not enough. I'll drop down to 75gr and work up from there.

--------------------


"Speak Precisely" G. Gordon Liddy.

"Life is absurd, chaotic and we must define its purpose with our actions" Abert Camus

"I''m the dude playing a dude disguised as another dude."

"Yo! Mr. White"

Post Extras: Print Post   Remind Me!   Notify Moderator  
bonanza
.400 member


Reged: 17/05/04
Posts: 2335
Loc: South Carolina
Re: A. Hollis 500/450 first range report [Re: bonanza]
      #49939 - 14/02/06 02:10 PM

1: 72gr of varget, 350gr NF - 2.1" group at 50 yards
2: " " - 2.3" " 100 yards
3: 76gr of R15 480gr WL - 2.5" group at 50 yards

Hornberner brass a little sticky.
Reformed Fed 470 nickel brass not sticky.

Pictures forthcomming.


--------------------


"Speak Precisely" G. Gordon Liddy.

"Life is absurd, chaotic and we must define its purpose with our actions" Abert Camus

"I''m the dude playing a dude disguised as another dude."

"Yo! Mr. White"

Post Extras: Print Post   Remind Me!   Notify Moderator  
bonanza
.400 member


Reged: 17/05/04
Posts: 2335
Loc: South Carolina
Re: A. Hollis 500/450 first range report [Re: bonanza]
      #49968 - 15/02/06 12:14 AM



--------------------


"Speak Precisely" G. Gordon Liddy.

"Life is absurd, chaotic and we must define its purpose with our actions" Abert Camus

"I''m the dude playing a dude disguised as another dude."

"Yo! Mr. White"

Post Extras: Print Post   Remind Me!   Notify Moderator  
bonanza
.400 member


Reged: 17/05/04
Posts: 2335
Loc: South Carolina
Re: A. Hollis 500/450 first range report [Re: bonanza]
      #49969 - 15/02/06 12:15 AM



--------------------


"Speak Precisely" G. Gordon Liddy.

"Life is absurd, chaotic and we must define its purpose with our actions" Abert Camus

"I''m the dude playing a dude disguised as another dude."

"Yo! Mr. White"

Post Extras: Print Post   Remind Me!   Notify Moderator  
bonanza
.400 member


Reged: 17/05/04
Posts: 2335
Loc: South Carolina
Re: A. Hollis 500/450 first range report [Re: bonanza]
      #49971 - 15/02/06 12:17 AM



--------------------


"Speak Precisely" G. Gordon Liddy.

"Life is absurd, chaotic and we must define its purpose with our actions" Abert Camus

"I''m the dude playing a dude disguised as another dude."

"Yo! Mr. White"

Post Extras: Print Post   Remind Me!   Notify Moderator  
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