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.244 mashburn Improved 30 degrees

 
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  #8  
Old 11-09-2013, 12:39 PM
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Join Date: May 2012
Posts: 49
Re: .244 mashburn Improved 30 degrees

Quote:
Originally Posted by AZShooter View Post
Your wildcat quest sounds interesting.

High speed is a description of a type of steel often used in machining. This is going to be less expensive than carbide and should do an excellent job.

Can I offer a couple of suggestions?

I think you would be better served with a 1 in 8 twist which will allow you to take advantage the wonderful high BC 105 Berger hybrid. High Hunting results are trickling in. Did you see the results in SkyKing's post?

Bottom of page: 7WSM 180 Berger takes down two Grizzlies!

The other idea is have Whidden make your sizer and seater dies. I own one of their FL/bushing dies and I give it high marks. When I need another custom die/die set I'll use them again.
As the rifle is to be a normal hunting rifle, I can't see myself shooting much past 400 yards. I thought the optimum weight projectile in terms of flat trajectory vs wind-drift would be around 90 grains, with the 95 grain Berger a good choice. I thought the 105 grain would be better if I were shooting longer distances rather than up to around 400 yards. I use the 150 grain Bergers at 3300 in a heavy 27 1/2 barrel 270 Dakota for the longer shots. I will look up Whidden but will probably choose RCBS as they are slightly cheaper than Redding and both do dies for 240 PSP. Thanks for the response.
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  #9  
Old 11-09-2013, 02:39 PM
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Join Date: Jun 2010
Location: greenwood, IN
Posts: 3,601
Re: .244 mashburn Improved 30 degrees

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Originally Posted by longarm View Post
I'm building a 25 inch medium taper barrel hunting rifle using a Winchester Model 70 intermediate length action, so I have 3.0 inches in the magazine well. Being a hunting rifle as opposed to a varminter or target rifle, I want it to feed smoothly. That is why I am steering away from the 40 degree Ackley Improved chambers with their wide shoulders to 26-30 degree shoulders that are not as far forward and not quite as wide. I like the long neck and 26 degree shoulder angle of the 6mm Remington case, but it has too much taper. I am planning a 1 in 10 twist and will be starting off using the 95 grain Berger Hunting VLD. If that doesn't do well, then I will try 90 grain or even the 100 Sierra GameKings. The .243 case would be ok in a short action, but in an intermediate length action using only 90-100 grain projectiles, it just doesn't have enough case capacity, even in AI format. I expect about 3200 fps with the 100 grain projectile out of 25 inch barrel.

I've just received the print for the 240 Page Super Pooper, and despite the stupid name, it seems to be about perfect. The neck/shoulder junction is 20 thou' below the neck/shoulder junction of the 6mm Remington, so I won't have any headspacing or fireforming difficulties using 6mm Rem brass. The shoulder diameter is 0.45 which is similar to the 6mm AI but not as far forward and with the 28 degree shoulder it should feed better. So it will have almost as much capacity as the 6mm AI but should avoid the potential feeding issues. The neck diameter is .277 at the top of the neck and gradually tapers out towards the bottom on the print so I won't have to turn the necks (I hope), even though the 6mm Remington is supposed to have a .276 inch neck diameter at the top and bottom of the neck.

I asked for a finish reamer and was told that they can supply me with a "high speed steel" reamer. Is a "high speed steel" reamer a finish reamer?
high speed steel, refers to a completely different class of steel than we would normally be thinking of. It hardens a few points harder, and heat treats differently. High speed steel is what most drill bits are made of, as well as most reamers and end mills. What particular type is in vogue right now I can't say, but some common ones are Rex M2, Rex 95, Gorham Cobalt, Speed Star. Vasco Supreme is about as hard of a high speed steel as I've ever seen, and also the most expensive. A high speed reamer often will cut better than a carbide one, but will need resharpening a little more often.
gary
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  #10  
Old 11-09-2013, 05:00 PM
Bronze Member
 
Join Date: May 2012
Posts: 49
Re: .244 mashburn Improved 30 degrees

Quote:
Originally Posted by AZShooter View Post
Your wildcat quest sounds interesting.

High speed is a description of a type of steel often used in machining. This is going to be less expensive than carbide and should do an excellent job.

Can I offer a couple of suggestions?

I think you would be better served with a 1 in 8 twist which will allow you to take advantage the wonderful high BC 105 Berger hybrid. High Hunting results are trickling in. Did you see the results in SkyKing's post?

Bottom of page: 7WSM 180 Berger takes down two Grizzlies!

The other idea is have Whidden make your sizer and seater dies. I own one of their FL/bushing dies and I give it high marks. When I need another custom die/die set I'll use them again.
I just had a look at SkyKing's post and it is impressive. I've only shot one black bear at about 80 yards with a 250 grain Sierra GK out of my .338 Win Mag and I still had to chase it into the alders and finish it off with a headshot. With the pronghorn and the 243 AI, again I've only shot one at 348 yards with the .270 140 grain Accubond at 3400 fps and I had to shoot it twice before it dropped. But both of those instances were not good bullet placement. So far I'm very impressed with the performance of the .270 150 grain Bergers, it would be nicer if their BC was higher than .531.

Thanks everyone for the info. on the high speed steel reamers.
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