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6SHOOTER
Australia
317 Posts |
 Posted - 06/10/2011 : 05:32:20
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Anybody re-chambered their standard .223wssm to the Ackley Improved?
If so, was it worth it in terms of velocity with no loss of accuracy or is it a case of "I just wanted one"??
I have re-barrelled my Coyote to .25WSSM so if the improved round is a good thing, then I may just consider it.....mainly for target shooting to 1,000 yards (if my scope allows me). It is a Simmons Whitetail Classic 6.5-20x50 with 210 clicks total at 1/4" each click. |
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CamoWildcat
USA
6931 Posts |
Posted - 06/10/2011 : 07:32:18
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You've got plenty of scope adjustment. Typically 40" (160 clicks) is enough to get beyond 1000. But I would definitely prefer target turrets so I wouldn't have to "count" clicks. And remembering to return to zero is sometimes a problem/hassle. You would want to put a 20 MOA base on the rifle or shim the rear base so your 100 yard zero is 15 to 20" below scope center.
The non-AI 223 wssm is easily capable of 1000 yards with a 'faster than 10' twist. I killed a groundhog at 823 yards last summer shooting a 55 grain bullet which was still above transonic at 900 yards. Going to at least a 70 grain bullet like the Berger 70 VLD will take transonic well past 1000 yards.
Bill, the Retired Nomad
"No free man shall be debarred the use of arms" - Thomas Jefferson
"If guns are outlawed, only outlaws will have guns." |
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wyldgene
USA
38 Posts |
Posted - 06/10/2011 : 08:06:48
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...since the case walls are relatively straight, going to a 35* shoulder isn't going to gain you much extra case volume, it causes feeding problems, & the cases don't have much support & tend to get folds in neck when loading (according to Winchester, that's why they went w/ the 28*)...
...help someone if you can, & do right by the Man... |
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CamoWildcat
USA
6931 Posts |
Posted - 06/10/2011 : 10:18:43
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Good points, wyldgene. And the 223wssm is already well overbore. In fact, it is the fastest FACTORY cartridge - even faster than the Swift.
Bill, the Retired Nomad
"No free man shall be debarred the use of arms" - Thomas Jefferson
"If guns are outlawed, only outlaws will have guns." |
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Tennessee Slim
387 Posts |
Posted - 06/10/2011 : 19:04:31
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I wasn't aware anyone made a reamer for a WSSM "AI". I remember Mike Milli at DTech was working on something similar a while back but he abandoned it in favor of what he calls "DTech Improved" (DTI) cartridges, based on a necked-down 6.8 SPC with (IIRC) a 30-degree shoulder. They come in .224, .243, .257 and 6.5mm.
The closest thing to a WSSM AI I'm aware of is the 6BR Improved, aka the 6mm Dasher. It has about 12 grains less case capacity but it does have 40-degree shoulders, and the same working pressure as the WSSMs. With heavy bullets, you lose usually less than 100 fps compared to the .243 WSSM. Case lengths and OALs are similar enough I think they'd both work in the same action. |
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6SHOOTER
Australia
317 Posts |
Posted - 06/10/2011 : 22:09:07
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Tennessee Slim - PT&G make a reamer for one but it may be a very new addition to their list. I have contacted some die makers and apparently I am the first to inquire about this round - but the reamer is available. To have a full length die made you would need to send the die makers fired cases or a reamer diagram. I doubt there would be any merit in doing this conversion. My Savage 10FP in .223 stabilised the 69gr Sierra's with a 1:10 twist barrel so my .223wssm should also.
Camo, according to my Sierra Infinity Suite program using a 60gr Hornady V-Max at 3,550fps with 1/4" clicks I would need 105 clicks to go from 800 to 900 yards and a further 137 clicks to go from 900 to 1,000 yards - does this sound right? Zero is 200 yards.
I only need to go from 300 to 1,00 yards. |
Edited by - 6SHOOTER on 06/10/2011 22:24:45 |
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CamoWildcat
USA
6931 Posts |
Posted - 06/10/2011 : 22:29:00
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No, it doesn't sound right. I think you are looking at drop instead of correction. Remember that one 1/4" click at 1000 yards moves POI 2.5".
I just worked up a scope correction table for my Savage 22-250 shooting 55 V-Max's at 3810 MV. With a 100 yard zero, I need to raise POA (Point of Aim) 26" (104 clicks) to hit a target at 1000 yards. Bullet would be below sonic and unstable, but that is the correction for drop.
Bill, the Retired Nomad
"No free man shall be debarred the use of arms" - Thomas Jefferson
"If guns are outlawed, only outlaws will have guns." |
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CamoWildcat
USA
6931 Posts |
Posted - 06/10/2011 : 22:38:30
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Maybe this will help http://www.jbmballistics.com/cgi-bin/jbmtraj_simp-5.1.cgi
After you press the calculate button at the bottom, you will see a chart. The first column is range, the second is drop, and the third column is scope correction IF you enter .9549 on the first page near the bottom where it says "Column 2 units". Be sure and keep MOA in the box to the right of where you enter .9549 which is for scopes like the Whitetail which are in inches per 100 yards and not MOA.
Hope this helps.
Bill, the Retired Nomad
"No free man shall be debarred the use of arms" - Thomas Jefferson
"If guns are outlawed, only outlaws will have guns." |
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6SHOOTER
Australia
317 Posts |
Posted - 06/10/2011 : 23:21:41
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Thanks Camo, those figures look a lot better from the JBM data. I only need 153 clicks from 100 to 1,000 instead of approximately 23 million!! from the Sierra program. It might not have the functionality or I might just not know what to input to get the right output.
As usual the knowledge of members of this site is second to none on all things short and fat.
Thanks again WSSM'ers. |
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CamoWildcat
USA
6931 Posts |
Posted - 06/11/2011 : 09:58:48
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Andrew, most long range shooters agree that the JBM ballistics is the most accurate ballistics program at long ranges. If your bullet is listed in the drop down menu with the word 'Litz' after it, use it and DON'T enter a BC. Bryan Litz has tested several bullets and that will be the G7 BC which is considerably more accurate at long range predictions.
I have found that I have to occasionally tweak humidity and atmospheric pressure (I also check the box labeled "Pressure is corrected") to get things to track better. And sometimes I need to adjust the velocity input a little. For example, if I shoot my 10" x 12" steel at 700 yards, the program might say adjust scope to 11.75" (47 clicks). But if I hit 3.5" high, then the program needs to say 11.25" for scope correction. (Again, remember that a half inch scope correction moves point of impact 3.5" at 700 yards.)
Bill, the Retired Nomad
"No free man shall be debarred the use of arms" - Thomas Jefferson
"If guns are outlawed, only outlaws will have guns." |
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6SHOOTER
Australia
317 Posts |
Posted - 06/12/2011 : 00:15:08
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| I have been on the JBM site before but was intimidated by all the inputs but with your link Bill, I was on the right page - thanks for that. I have now input my 3 cartridges and have saved the results page to Favorites on my home page so now I can just click on the favorites link and it brings up the specific cartridge info. Due to my love of shooting but limited chances to go hunting (when my Bull Terrier needs more food!) I will spend most every Saturday arvo at the Target Range thus getting a lot more out of my guns. Will let you know on load development in the coming weeks. |
Edited by - 6SHOOTER on 06/12/2011 03:53:43 |
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CamoWildcat
USA
6931 Posts |
Posted - 06/12/2011 : 08:39:51
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Glad to be of help. Hmm, when I tried to save two different cartridges, the most recent entries came up for both. How did you manage to keep them different?
Bill, the Retired Nomad
"No free man shall be debarred the use of arms" - Thomas Jefferson
"If guns are outlawed, only outlaws will have guns." |
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6SHOOTER
Australia
317 Posts |
Posted - 06/12/2011 : 08:59:36
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| good point Camo. I just went back to JBM using the favorites tab and it indeed only shows the most recent data...bugger.... |
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CamoWildcat
USA
6931 Posts |
Posted - 06/12/2011 : 09:28:57
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Yeah. Bummer is right. I want to be able to call up the info for a particular cartridge and make changes to the wind speed/direction.
I can save different calculated (ballistics) sheets, but I can't save different entry sheets.
Bill, the Retired Nomad
"No free man shall be debarred the use of arms" - Thomas Jefferson
"If guns are outlawed, only outlaws will have guns." |
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Tennessee Slim
387 Posts |
Posted - 06/13/2011 : 03:05:37
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You know, since I started looking at the numbers on the 6Dasher, I've about got myself convinced I want one. Or maybe a .257 DTI.
Aw, hell, I reckin' I want 'em all. I'm just gonna have to get me a job cooking crystal meth so I can afford all my "wants." |
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6SHOOTER
Australia
317 Posts |
Posted - 06/13/2011 : 04:12:17
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| Tennessee Slim, I live in a small country town in Western Australia and in our State capital there have been 85 drug labs busted by police so far this year. All this in a city of less than 2 million people!! Most of them get busted just after the **explosion** reduces the house to rubble! |
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mbkmkk
USA
1259 Posts |
Posted - 06/13/2011 : 06:24:39
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quote:
Originally posted by Tennessee Slim
Aw, hell, I reckin' I want 'em all. I'm just gonna have to get me a job cooking crystal meth so I can afford all my "wants."
That was Great! |
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CamoWildcat
USA
6931 Posts |
Posted - 06/13/2011 : 08:41:50
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Slim, isn't the Dasher an "improved" BR? Or am I thinking of something else?
6shooter, you call a city of almost 2 million a "small country town"? Oops, never mind, I see your state capitol is almost 2 million - not the town you live in.
Bill, the Retired Nomad
"No free man shall be debarred the use of arms" - Thomas Jefferson
"If guns are outlawed, only outlaws will have guns." |
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Tennessee Slim
387 Posts |
Posted - 06/13/2011 : 13:01:39
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| CW, you're right. The 6BR has more illegitimate children than Arnold Schwarzenegger, including the 6Dasher. |
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mbkmkk
USA
1259 Posts |
Posted - 06/13/2011 : 14:19:17
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| I just picked up a couple 6BR's in 8-Twist and they are very accurate! |
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Topic |
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.223 WSSM Ackley Improved
