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Post by c18rch on Apr 29, 2015 6:35:59 GMT
The RRC has got me thinking about extreme long range shooting bullets. This last one was the second one where my loads we're going subsonic but still getting consistent hits. So I am proposing this thread be a list of those bullets which you know do or do not remain stable thought transonic flight and give good results when subsonic. The ones I've tested so far that DO remain stable are: - Hornady 162gr A-Max
- Hornady 155gr A-Max
- Hornady 150gr SST
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Post by tisme on Apr 29, 2015 7:12:45 GMT
I've shot these three well below super sonic speed and no reports of bullet shaped holes. The 69gr MKs went out to 1240yards.
Sierra .224 69gr MKs
Sierra .30 175gr MKs
Berger .30 155.5gr fullbore
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Post by davet on Apr 29, 2015 8:34:45 GMT
Guys
Bit confused as to how you determine that certain bullets are actually stable at target......have you been able to shoot on paper to see 'keyholing' at these extremes of distance?
Surely a hit on a gong (satisfying though that is at long range) is not a reliable indicator that its still truly stable?
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Post by tisme on Apr 29, 2015 9:11:01 GMT
Yes I've seen bullet shape holes in targets before. Two of mine were shot at Bisley at 1100yards and round holes in target and quite good grouping the .224 was at Lydd shooting 1240 yards at the top od a figure 11. I hit it 6 times in a row and I don't think that would have happened if it was tumbling.
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Post by c18rch on Apr 29, 2015 9:59:53 GMT
I must admit I haven't shot the 162's on paper at subsonic ranges so they may be tumbling but, they go subsonic between 1175 and 1250. I would find it had to believe that they can make it another 100-125 yds accurately if they were tumbling. Measured through the scope reticle, the hits made at 1350 were all withing 1moa ish. The misses were laterally which were due to the wind I think.
The others I listed I've shot on paper at bisley and the markers have confirmed they are not key-holing.
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Post by c18rch on Apr 29, 2015 10:17:14 GMT
Summary So far; DO:- Berger .30 155.5gr fullbore
- Hornady 162gr A-Max
- Hornady 155gr A-Max
- Hornady 150gr SST
- Sierra .224 69gr MKs
- Sierra .30 175gr MKs
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Post by davet on Apr 29, 2015 10:18:24 GMT
Looking good then.
I need same data for 6.5 and 6mm.
For the 6.5 (260 Rem) I am currently using SMKs and Lapua at 123g so will probably have to go up to 140 class bullets to get further out but they are both perfectly ok at 1000 yards.
For the 6mm its the same story with 115g DTACS.....not yet gone beyond 1000 but good for that so far.
Guess we also need to publish MVs
At a chrono'd 2900 - 3000 MV the above are dropping below nominal supersonic (call it 1200 fps for the sake of arguement) at around the 1200 yard mark....this out of Applied Ballistics data.
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Post by c18rch on Apr 29, 2015 10:52:48 GMT
Summary So far; DO:- Berger .30 155.5gr fullbore
- Hornady 162gr A-Max (2550 fps)
- Hornady 155gr A-Max (2600 fps)
- Hornady 150gr SST (2795 fps)
- Sierra .224 69gr MKs
- Sierra .30 175gr MKs
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Post by tisme on Apr 29, 2015 11:24:55 GMT
Looking good then. I need same data for 6.5 and 6mm. For the 6.5 (260 Rem) I am currently using SMKs and Lapua at 123g so will probably have to go up to 140 class bullets to get further out but they are both perfectly ok at 1000 yards. For the 6mm its the same story with 115g DTACS.....not yet gone beyond 1000 but good for that so far. Guess we also need to publish MVs At a chrono'd 2900 - 3000 MV the above are dropping below nominal supersonic (call it 1200 fps for the sake of arguement) at around the 1200 yard mark....this out of Applied Ballistics data. If it helps My 260 was hitting the furthest target at the RRC (we measured 1390 yards) muzzle speed 2817fps, POI speed (Strelock) 1180fps. Bullet was 140gr berger hybrid. Holdover was 47.25 moa. |
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Post by davet on May 2, 2015 8:05:21 GMT
Looking good then. I need same data for 6.5 and 6mm. For the 6.5 (260 Rem) I am currently using SMKs and Lapua at 123g so will probably have to go up to 140 class bullets to get further out but they are both perfectly ok at 1000 yards. For the 6mm its the same story with 115g DTACS.....not yet gone beyond 1000 but good for that so far. Guess we also need to publish MVs At a chrono'd 2900 - 3000 MV the above are dropping below nominal supersonic (call it 1200 fps for the sake of arguement) at around the 1200 yard mark....this out of Applied Ballistics data. If it helps My 260 was hitting the furthest target at the RRC (we measured 1390 yards) muzzle speed 2817fps, POI speed (Strelock) 1180fps. Bullet was 140gr berger hybrid. Holdover was 47.25 moa. Tisme I am going to try the 140 Bergers as we cannot use Scenars at RRC....did you find it sensitive to seating depth? I plan to try N560 as that works really well with 139g Scenars but H4350 looks like a good option...if I can get any! |
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Post by tisme on May 2, 2015 10:19:18 GMT
The 140 bergers in my rifle are a long way off the lands and it shoots really well. H4350 is what i've been using 42.2 grains
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Post by davet on May 2, 2015 16:28:06 GMT
The 140 bergers in my rifle are a long way off the lands and it shoots really well. H4350 is what i've been using 42.2 grains Thanks for info....some time ago when I worked up a H4350 load for 139g Scenars I settled on 42.5g so about the same as you.
I plan to compare N560 (have loads of it!) with H4350 and see if either one is a clear winner....IF I can lay my hands on the bullets!
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Post by c18rch on May 2, 2015 20:03:46 GMT
Which bullets you after? The bergers or scenars?
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Post by davet on May 2, 2015 20:47:48 GMT
Which bullets you after? The bergers or scenars? The Bergers Rich...I already have about 1500 Scenars but can't use these at RRC !
Initially I only want about 100 in case load testing goes badly......after that I would buy a greater quantity.
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Post by c18rch on May 2, 2015 21:42:44 GMT
I'll see what I can do.
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