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US 869 Lot to Lot differences

 
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  #22  
Old 12-27-2006, 08:14 AM
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Re: US 869 Lot to Lot differences - Hey Kirby

Very good information Roy, That's what I was talking about having a little more to work with. Ther ain't no way I can try H-869 with the 195's down here, it's just to fast in my opinion to even waste time and money on. But if you could gather some info with H-869 and the 169.5's it would be of great help.

I'm using WC-872 with the 195's, and H-869 with the 169.5's.

I have the 195's at 3250 with 94grs. of WC872 in 72* temps.
I'm going to push the envelope a little this weekend with the 195's and AA8700 to try to get 3350. I have touched 3400 with 872. My thinking is to have the 195's going 3350-3400, and the 169.5's 3300-3350 and could pretty much use the same drop dope.

Tim
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  #23  
Old 12-27-2006, 09:55 AM
Chawlston
 
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Re: US 869 Lot to Lot differences - Hey Kirby

Hello,

Do you turn your case necks? If not you may have a case that has a thinner wall and consequently less pressure and less velocity.

James
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  #24  
Old 12-27-2006, 11:34 AM
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Location: Blackfoot, Idaho
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Re: US 869 Lot to Lot differences - Hey Kirby

Chawlston,

I turned the necks on the first batch of cases. Twas a mistake as the neck tension was too low.

On these three cases I used the Wilson 270 neck reamer. I have consistent and sufficient neck tension per handle pressure when resizing.

Per Kirby, I FL size each shot but don't bump the shoulder.

Tim/TX

H-869 too fast? I'm thinkin' it a schoshi bit too slow... thus the thought for something like a 215 gr WC??? Or am I thinking backwards again?

95gr/20K jump = say 3082 -- 95.5gr/20K jump = say 3093. That's 0.5gr about powder for 13 FPS and just a bit of pressure indication (bolt lift)????

Up here the 169 @ 3250 and the 195 @ 3100 (I'll settle for anything over 3000) is so flat shooting its almost embarrassing. With a 300 yd zero the the drop is pretty much 16.1 MOA @ 1K which is one full turn plus one moa on my scope. Heck, even I can keep track of that.

BTW when your bbls get shot out it ought to be about the time I'll want to put together a 270 WSM Striker project. Wanna sell half a barrel [img]/ubbthreads/images/graemlins/grin.gif[/img] [img]/ubbthreads/images/graemlins/grin.gif[/img] [img]/ubbthreads/images/graemlins/blush.gif[/img]
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  #25  
Old 12-27-2006, 06:08 PM
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Re: US 869 Lot to Lot differences - Hey Kirby

FYI, Ramshot Magnum is way way too fast for the 270 AM and either bullet. 195 WC and 82 grains - no pressure most probably just below max load. 84 grains, the bolt opened stiffly and the rubber mallet was used to complete the operation. [img]/ubbthreads/images/graemlins/frown.gif[/img]

Too dark to Chrono.
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  #26  
Old 12-27-2006, 09:23 PM
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Re: US 869 Lot to Lot differences - Hey Kirby

Roy, what kindof BC are you getting on the 169's and 195's up there.

169's @ 3300 give me a BC of .62
195's @ 3250 has a BC of .65

I'm able to get good fast numbers but no high BC numbers like yall get up there. Don't get me wrong I'm not dissatisfied be any means. I mean where in the world are you gonna find a 277 bullet with a BC close to 7. Thanks to our good friend Richard up north that made it possible. I heard tell he is working on a 200grainer for the 277 caliber. Don't think I will need them though. If I can get the 195's 3350-3400 with the lower SD I really think I can hang with the 7AM and just might surpass it. [img]/ubbthreads/images/graemlins/laugh.gif[/img]

Hey, when are you coming hog huntin with me and Mike. We'll have a blast, I s--t you not.

Tim
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  #27  
Old 12-27-2006, 11:29 PM
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Re: US 869 Lot to Lot differences - Hey Kirby

I was told that a 0.74 would be real close for the 169. @ 3250 its tracking pretty much spot on to 500 meters.

I was also told that 0.91 would be good for the 195. It 'seems' to track right along with the 169 to 500 meters @ 3090 MV.

The weather fronts have been moving through here about every 3 or 4 days with high winds coming and going between. Just a few hours in between with no wind and sometimes those times are at night and other times they on days I can't shoot.

When there is no wind for a brief period I hit the back yard 200 yd range but there are still cattle out to 1K plus the swanps have thawed again.

Its a 20 min drive to the shooting club range but by the time everything gets set up out to 500 meters the wind is blowing again.

Last time out, I had to tie a rock to the center of the tripod to keep the chrono from blowing over. [img]/ubbthreads/images/graemlins/frown.gif[/img]

Still thinking about the hogs. Maybe middle of Jan. Not sure. Depends on bidness.
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  #28  
Old 01-02-2007, 11:19 AM
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Learn\'d something yesterday Re: US 869 Lot to Lot differences

If a fella (me) could just open his mind a bit quicker he'd sure same some time and $, but would it be so much fun.

If I'd of done the ladder test thing I'd have learned this sooner and Richard wouldn't have so many of my $. [img]/ubbthreads/images/graemlins/smile.gif[/img]

Shooting my 270 AM with 195s I got fixated on 3100 fps mv for some reason. Its stuck in my knoggin that the more FPE is better, always. But what is sufficient. I guess I'm just caught up in my own "stinkin thinkin"

After doing every thing that I knew of to get the 195 WC to shoot up to my accuracy expectations and having no luck and getting very frustrated I let go of the 3100 fps requirement. Hell, the 195 @ 3000 FPS MV give just over 2100 FPE @ 1K. Do you need more than that for a Muley or occasional Elk? [img]/ubbthreads/images/graemlins/blush.gif[/img]

Check this data:

Grns - VEL - ES - 200yd Group
95.0 - 3112 - 169 - 2.32" 10, 3 shot groups.
94.5 - 3105 - 46 - 1.57"
94.1 - 3096 - 26 - 1.71"
93.6 - 3081 - 15 - 2.4"
93.1 - 3088 - 41 - 1.1"
92.6 - 3058 - 31 - 0.72"

To my thinkin there was no significant drop in velocity from 95 to 93.1 grains (throw out the extreme spread velocities and the 95s are the same as the 94.5s) while group size consistently shrunk (except for the 93.6 group [img]/ubbthreads/images/graemlins/blush.gif[/img])

I'll verify the lower powder weight load this morning then I'll have to order more WCs. [img]/ubbthreads/images/graemlins/crazy.gif[/img]

The small change in average velocity for the seemingly fairly large change in powder weight may be my lack of familiarity with such large capacity cartridges.

For a fella that has gone through 9 episodes of the 7-yr itch there still is a lot to learn. It irks me that GG has got such an early start [img]/ubbthreads/images/graemlins/mad.gif[/img] [img]/ubbthreads/images/graemlins/blush.gif[/img]

================================================== ===========
Edited from here down:

Well so much for that idea [img]/ubbthreads/images/graemlins/mad.gif[/img]
Just got back from the back yard shooting 92.8 gr US 869 and 195 WCs off the bench @ 200.

Velocities: 3116/3085/3064
Avg: 3088
ES: 52

Group: 0.9" Horizontal 2.0" Vertical

Low group shot: 3085
Mid group shot: 3116
High Group shot: 3064

24*F
78%
25.756 @ 4450
30.196 @ Sea Level
Zero wind.

All equipment/loads for all the above shots & groups were fully acclimated. That is, stable at ambient conditions.

Potential problems.
Poor temp compensation on the chrony
Spastic US-869 burning rate
Erratic ignition (Have used GMs, 250s, Rem 9 1/2s all act the same.
I just can't shoot!

Why does it shoot the 169.5s so darn well and the 195s so erratically? Maybe I ought to dump the bench and shoot prone from bipods.
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