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The Amazing 270 Win - revisited

 
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  #8  
Old 11-06-2012, 08:34 PM
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Re: The Amazing 270 Win - revisited

WOW, those velocities seem a little high Roy, were loading the same loads at about 200fps slower if I remember right. Your launching that 140 Berger right at the top end I would push it from my 270 WSM with 72 gr of Retumbo mashed into the case!!

Good luck on those woofs!!!!!!
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  #9  
Old 11-07-2012, 11:42 PM
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Location: Blackfoot, Idaho
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Re: The Amazing 270 Win - revisited

Rhian,

I don't understand it, but it is what it is.

Woof hunt went great. Just got in. No woofs. Two great hunts. Morning and evening.

The other two fellas were after spike elk using smoke poles. I carried a LR rig just in case a woof appeared. Saw one yote in a herd of angus.

One fella missed a shot at a little spike just before dark. Glad he missed. (verified miss). It was up high and back in.

I'll edit the videos and post 'em tomorrow some time.
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  #10  
Old 11-08-2012, 11:01 AM
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Re: The Amazing 270 Win - revisited

Yo! Wampum!!,

I'll give it a go.

Here's the first shot @ each distance for drop validation.

Purpose: Validate velocity. The chrony can't have been correct.

Rifle:

270 Win
1908 Mauser Action (Brazilian)
Lilja Barrel Finished 27" w/0.655" muzzle diameter. (Barrel fitted by Ray Montgomery - Longmont CO.)
Optic: 10X Super Sniper - Mil Dot
Load - As shown above - 59 gr 7828ssc - CCI 200 primer - Berger 140 VLD Match Grade - Lot# 0000973
Guestimated MV: From weird chrony readings - 3366 FPS

Process:
200 yard zero data was 65*F, 25.50 "Hg
Entered data into JBM Trajectory Calculation. Created chart in MILs out to 1000 yards.
Used Byan Litz bullet data.

Entered data into "Shooter" with perfect agreement with JBM.

Stuck shooting gear and rifle in the back pack (28 lbs) and headed for the shooting spot.

Shooter inputs at the shooting spot:
Temp: 57*
Baro: 23.26 (Multiplied the Leica 1600 psia by 2 - close enough)
Wind 15 MPH from 270*
Muzzle Velocity: 3366 FPS

This being the 3rd serious trip to this spot it's beginning that the wind is kicking my but by least 20%. The wind meter had no better than 10 mph from where I was.

I held into the wind as directed by "Shooter" intending to watch the video for the education. (I appear to be in remedial wind reading!! )

Shooting distances were selected, considering range and angle, to shoot with whole MILs without having to interpolate between dots.

Test: If drops are spot on, then so is the input velocity.

Shot #1 - 448 yards - 19* down angle
Shot #2 - 590 yards - 9.0* down angle
Shot #3 - 750 yards - 11* down angle

At that elevation, ~6600' 5 MILs drop was right at 980 yards. Didn't take that shot today. Thinkin' I'll get the kid to upgrade the scope to an MOA reticle and target turrets. Who says the ol' Winny ain't a LR rig? @4800' elevation 1k del = 1855 w/1070 FPE. Woot Woot!!!

Shot notes:
590 yard shot - the little round POI is pretty close to 0.20 Mils. Hit is about 0.20 mils up from center.

750 yard shot - The MBR (minimum bounding rectange - GIS speak ) around the POI is 1.0 Mils square.

270 Win Initial Drop Chart Confirmation :: 448 yd initial drop confirm shot video by royinidaho - Photobucket

270 Win Initial Drop Chart Confirmation :: 590 yd initial drop shot video by royinidaho - Photobucket

270 Win Initial Drop Chart Confirmation :: 750 yd initial drop shot video by royinidaho - Photobucket
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  #11  
Old 11-09-2012, 12:37 AM
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Join Date: Mar 2010
Location: Idaho Falls
Posts: 293
Re: The Amazing 270 Win - revisited

Very interesting. Just so happens ill be workin up a load for my pre 64 270 after I get these drops trued for my ultra. Gonna have to look into this.

Headin up to that fall creek country for 10 days or so, if your out and about lookin for woofs we might see ya. We did see 4 around flag knoll so their there,dispite what f+g says


Great thread.......
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  #12  
Old 11-09-2012, 07:03 AM
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Location: Great Falls, MT
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Re: The Amazing 270 Win - revisited

Roy,

You're having way too much fun!

Ed
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  #13  
Old 11-09-2012, 10:35 PM
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Re: The Amazing 270 Win - revisited

I love 7828ssc in my 300 WSM. It's darn near the perfect powder for 190+ grainers. I think you'll be impressed with how temp insensitive it is too.
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  #14  
Old 11-10-2012, 01:01 PM
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Posts: 95
Re: The Amazing 270 Win - revisited

Tag for info
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