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270 caliber taken to a totally differnet level, 195 gr ULD RBBT....

 
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  #22  
Old 07-07-2006, 08:54 AM
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Re: 270 caliber taken to a totally differnet level, 195 gr ULD RBBT...

Kirby,

Any different throat considerations for the 195 vs the 169.5?

Also, what would be the recommended powder for the heavier bullet, 869 or 872 or either?
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  #23  
Old 07-07-2006, 01:20 PM
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Re: 270 caliber taken to a totally differnet level, 195 gr ULD RBBT...

Roy,

Since your rifle will be a single shot I would recommend throating the rifle so that the 169.5 gr ULD RBBT was seated just above the base of the neck/shoulder junction. This will allow the use of both bullets with adiquate neck tension on both and use up as little case capacity as possible. You may need to pull the bolt to eject a live round though.

This is pretty much how Richard 277 AM is throated and it worked very well with 169.5 gr ULD RBBTs and 195 gr ULD RBBTS. You do not want to stick yourself with only one bullet choice so this throat length is about the best. Will even work with lighter bullets in the 140 and 150 gr range if needed.

Either WC872 or US869 will work great. From what I am seeing, US869 will get you to top pressures about 3-4 grains faster then WC872. THis is with the lots I have so it will surely chance from lot to lot.

Both will work very well though.

Kirby Allen(50)
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  #24  
Old 07-07-2006, 02:10 PM
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Re: 270 caliber taken to a totally differnet level, 195 gr ULD RBBT...

I will have to rattle his cage a little on that. I will be ordering the Swaro rangefinder from BJ next week so I am hoping to have some chucks dying a ways out there next weekend.
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  #25  
Old 07-07-2006, 04:45 PM
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Re: 270 caliber taken to a totally differnet level, 195 gr ULD RBBT...

First number will be for 130 gr bullet / second 195

Yards..........Drop............Wind drift
500.........-16"/-19.5"........12.6"/7.7"

750.........-62"/-71"..........33.4"/18.0"

1000........-150"/-160"........60.6"/33.5"

1250........-302"/-277"........104.6"/54.7"

1500........-549"/-479"........166.6"/82.6"

1750........-936"/-732"........247.5"/118.1"

2000........-1498/-1067".......343.8"/162.0"

I will admit that for bullet drop, the 130 will be flatter shooting out to about 1150 yards where the 195 had caught up to the fast lighter bullet. Again, if trajectory is your major concern and you will not be shooting out past 1000 yards, the 130 will shoot flatter then the 195 gr ULD RBBT.


what would the the wind and drops be for the 169.5 bullets
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  #26  
Old 07-07-2006, 05:57 PM
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Re: 270 caliber taken to a totally differnet level, 195 gr ULD RBBT...

Here are the numbers using the same specs as the 130 and 195 gr load.

Yards............Drop..........Wind
500..............-15"..........9.5"

750..............-64"..........23"

1000.............-151".........43"

1250.............-287".........71"

1500.............-488".........109"

1750.............-774".........159"

2000.............-1173"........221"

Its alot closer to the 195 gr ULD RBBT but still the 195 has a pretty significant advantage in wind drift. In all honest, either the 169.5 or 195 gr will be head and shoulders above anything else out there in 270 cal or even 7mm or 30 cal with the velocity potential they have.

Good Shooting

Kirby Allen(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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