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Its finally time!!!

 
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  #15  
Old 08-12-2004, 07:53 AM
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Join Date: Dec 2003
Location: Wi
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Re: Its finally time!!!

Does she have a tight neck? Planning on a 338-378 myself but haven't decided if I should stay with it straight or go your route. Have you turned the weatherby cases or can't you do this before fire forming?
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  #16  
Old 08-12-2004, 01:10 PM
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Re: Its finally time!!!

Budman,

When I ordered my reamer specs, I did not want a "tight" necked rifle. That being said I did want an accurate snug neck.

I specified my reamer to have a neck diameter of 0.3690". My loaded ammo using the 300 gr Sierra Mk has a neck diameter of 0.3675" or roughly 0.0015" less then my chamber neck dimension which provides my preferred 0.00075" bullet release per side when fired.

With the lot of brass I am using now, there is no need to turn necks nor does the brass require this proceedure. If it did though, I would be able to turn 0.0005" of the neck and still have a good fitting neck.

My theory is that 90% of a chambers accuracy potential, given that everything is square and true to the axis of the bore, which it better be, is centered in the area when the leade starts and the throat ends.

I have my extreme accuracy reamers build to cut a throat tht is only 0.0002" over bullet diameter. In a big game rifle this is a little tight in my opinion, but perfect for an extreme range rifle that will have its ammo loaded with top quality comp. dies for run outs of under 0.001".

The last few batches of Sierra 300 gr Mk's I have measured were running 0.3383" to 0.3384" in diameter. For this reason, I ordered my reamer to cut a 0.3385" diameter throat. This is an area where tight is a good thing.

The throat on this rifle is not overly long, just a bit less then .300". This positions the full diameter base of the 300 gr Mk even with the bottom of the case, allowing maximum case capacity volume while still ensuring the total case neck is used to support the bullet.

So to answer your questions, no I do not need to turn my necks but have the option to true them up is needs be without creating excessive play in the neck area.

Good Shooting!!!

Kirby Allen(50)

this throating system has worked well for me with several different calibers.
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Kirby Allen(50)

Allen Precision Shooting
Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.

Farther, Faster and Flatter then ever before.

Web Page: www.apsrifles.com

allenmagnum@gmail.com
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  #17  
Old 08-12-2004, 01:53 PM
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Posts: 267
Re: Its finally time!!!

Fiftydriver

I hope you don't mean your stock is as ugly as this one!
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  #18  
Old 08-12-2004, 08:37 PM
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Re: Its finally time!!!

Randy,

The pick did not come up on the post???

At least not on my screen.

Good Shooting!!!

50
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Kirby Allen(50)

Allen Precision Shooting
Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.

Farther, Faster and Flatter then ever before.

Web Page: www.apsrifles.com

allenmagnum@gmail.com
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  #19  
Old 08-13-2004, 07:13 PM
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Join Date: Apr 2004
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Re: Its finally time!!!

Hey Fifty Driver I relize your busy building a great Rifle .Hope you get out of it what you want and then some.Could I ask you to give me your opinon on my range trip with the 6x284. Found H4350 was kick ass great. Thanks looking forward to some pixs of your current project.
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  #20  
Old 08-28-2004, 04:54 PM
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Re: Its finally time!!!

jb1000br,

Tried to e-mail you the pics of my 338 Kahn and got a "could not deliever" message.

Could you give me your e-mail again and I will try to send them again, maybe I got it wrong the first time.

TOok the big girl out to my 300 yard range today, still basically breaking the barrel in but it is polishing up nicely, like all Lilja barrels do.

I am now shooting 3 shot groups and cleaning between each group to get a little load developement done while I am breaking in the barrel.

The light was to low in the sky to use the chrono this morning but I am more interested in group size right now more then velocity, I will get real serious when the 300 and 350 gr ULD Wildcat bullets get here.

Anyway, shot four groups and here are the results:

Group 1, 103.0 gr H-50BMG

0.912" ctc


Group 2, 104.0 gr H-50BMG

1.006" ctc


Group 3, 105 gr H-50BMG

1.117" ctc


Group 4, 106 gr H-50BMG

1.010" ctc


The rifle is averaging 1/3 moa with ammo basically thrown together and the nice thing is that the first shot out of every group is the flier from the oily barrel.

The second two rounds of each group range from .421" ctc at the largest to .113" ctc for the tightest.

I am sure that without the cleaning between each group, the group size would average in the 1/4 moa range pretty easily.

Like I said, I have no velocity data yet but I can tell you these loads do not produce enough pressure to open the case mouths when firing so they are in the 45,000 to 50,000 psi range.

I just loaded up 107.0, 108.0, 109.0 and 110.0 gr with the 300 gr Sierra Mk and will test them tomorrow. I think I will get some chrono readings as well and I will set up at my 500 yard range to get a better idea of the load performance.

Will let you know how things go.

So far, I am happy with 1/3 moa at 300 yards but hope to trim that to an average of 1/4 moa at 500 yards in ideal conditions which this morning it certainly was not, about a 20 mph cross wind but did not produce any horizontal stringing.

Good Shooting!!

Kirby Allen(50)

[ 08-28-2004: Message edited by: Fiftydriver ]
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Kirby Allen(50)

Allen Precision Shooting
Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.

Farther, Faster and Flatter then ever before.

Web Page: www.apsrifles.com

allenmagnum@gmail.com
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  #21  
Old 08-28-2004, 06:35 PM
LB LB is offline
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Join Date: Jul 2004
Location: Upland, CA
Posts: 423
Re: Its finally time!!!

Interesting thread. Best of luck. I may send you some work, if you can give me an opinion of KP barrels? LB
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