9.3 bullet test started. pics posted in #1

bat119 said:
While we are waiting for the test has anybody ever tried to improve the 9.3x62 like an Ackley improved? I wonder if a 40 degree shoulder would make a difference ?
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My guess is it would make ZERO difference - the '62 doesn't have much of a shoulder anyway. If you're after speed, a 9.3x62 probably isn't for you...
 
bat119 said:
While we are waiting for the test has anybody ever tried to improve the 9.3x62 like an Ackley improved? I wonder if a 40 degree shoulder would make a difference ?
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I have done exactly that . with the headspace set so I can still fire a factory round , the improved rounds are about 10 percent larger in case capacity .

but just as important , I opened up the magazine and action to handle just over 3.5 " overall length for a loaded round . what this does is it keeps the bullet out of the case as much as possible .

I haven't run it over a chronograph yet , but I can squeeze 75 grains of h414 / w760 behind a 250 grain nosler accubond . ( the compressed powder charge being the limiting factor here , not the pressure generated ) .

i'll mention this too , my loads with the 250 grain bullet have noticeably more recoil than the factory rounds from lapua , norma and privy with a 285 / 286 grain bullet ..... but that is also not a fair comparison due to the fact that the brass is being stretched into a larger chamber , effectively lower the pressure slightly on the factory rounds .


edit , I changed 65 grains to 75 grains ..... I went back to my notes and 65 grains is what I use with cast bullets .
 
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358 BLR said:
I think the plan is to test them on game animals, so they're waiting for the season to open. I think they are also keeping a low profile because they're not sure if they are going to
get enough tags. All I can say is that you better start making room in your freezer, because come December they'll be giving it away. :)
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never thought on that one will think now lol ...
 
358 BLR said:
It all takes time and this kind of information is definitely worth waiting for.
However, when you voluntarily under take this kind of project you have to expect the "Dad, are we there yet?" mentality from all the spectators. :)
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that is for sure. and imagine when the results will be out some will complain too lol ...

anyway i have the powder, close to the end on milk jugs so we can start soon the reload and some tests ...

thanks for the patience ...

i never been a fast pacer anyway ...
 
burnt_servo said:
I have done exactly that . with the headspace set so I can still fire a factory round , the improved rounds are about 10 percent larger in case capacity .

but just as important , I opened up the magazine and action to handle just over 3.5 " overall length for a loaded round . what this does is it keeps the bullet out of the case as much as possible .

I haven't run it over a chronograph yet , but I can squeeze 65 grains of h414 / w760 behind a 250 grain nosler accubond . ( the compressed powder charge being the limiting factor here , not the pressure generated ) .
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If 65 grains of H414/760 is a compressed load for the 250 AB at 3.5" and 10% greater capacity, what brass are you using? It must have capacity much less than the standard 77 grains water. I can easily load 70 grains (not H414) behind the 250 AB at 3.37" COL in Hornady brass sans AI! Yes, it's compressed but less than 10%.

Bob

www.bigbores.ca
 
bigborefan said:
If 65 grains of H414/760 is a compressed load for the 250 AB at 3.5" and 10% greater capacity, what brass are you using? It must have capacity much less than the standard 77 grains water. I can easily load 70 grains (not H414) behind the 250 AB at 3.37" COL in Hornady brass sans AI! Yes, it's compressed but less than 10%.

Bob

www.bigbores.ca
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I measured privy 9.3 brass , then measured it after fireforming and it was about a 10% increase . 73 grains of water before and around 80 grains of water after .
30-06 , Winchester brass after fireforming was around 81 grains of water , but the neck was also longer ( I can't remember off hand how much more ) .

I had to make a edit to my previous post , I made a mistake on my load data .
I use 65 grains of h414 behind a 286 grain cast bullet .

behind a 250 accubond I'm using 75 grains of h414 .
 
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burnt_servo said:
I measured privy 9.3 brass , then measured it after fireforming and it was about a 10% increase . 73 grains of water before and around 80 grains of water after .
30-06 , Winchester brass after fireforming was around 81 grains of water , but the neck was also longer ( I can't remember off hand how much more ) .

I had to make a edit to my previous post , I made a mistake on my load data .
I use 65 grains of h414 behind a 286 grain cast bullet .

behind a 250 accubond I'm using 75 grains of h414 .
Click to expand...

There, that makes more sense!:cool:

Bob

www.bigbores.ca
 
Why not? said:
I don't use any 250 gr loads for hunting, but a friend of mine gave me a handful of 250 gr ABs to try, and they slip out of the muzzle at way over 2700 fps.

Ted
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Ted, I'm loading the 250 AB to 2714 for bear, upcoming in about a month. I dropped the load by one grain of RL-17 and the 3-shot group shrank from .75" to .44" from my Tikka Lite. Should work, don't ya think? The .75" load was plenty good enough at 2760 but the new scope was showing some "weakness". Took it to Toronto for rehab and they say it will now handle "magnum recoil" without a problem! Ha! It was supposed to anyway; a Bushnell Elite 3 - 9 X 40. I hope they know their business. It has the "Firefly" with broad crosshairs that glow green. Better for a black bear after the sun had gone down 29 minutes earlier!

Not that the 286 Partition was inaccurate at MOA, but 1/2 MOA with less recoil sounds better.

Take care,

Bob

www.bigbores.ca
 
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