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Post by spaniel on Sept 12, 2010 17:41:03 GMT -5
For those of you who have shot the 200SW to 300 yards using 2700+ fps MV, how much drop are you seeing? In my BP gun I always found a .17 BC to reliably predict my drops. Using this, my 2770 fps MV in my Savage yielded a predicted 6.9 MOA drop. I set my scope to 7 MOA and fired a nice group...into the wood over my target backer. I dropped to 5 MOA and fired a single round near center, no time for another group.
No matter what I do with MV or BC, not one but both have to be significantly off to see a 2 MOA error. I'll fire a full group next time but this was very odd, I checked my 100yd zero before moving to 300 and obliterated my aiming point.
All else I can think is my scope (new) is adjusting over 1/4 MOA per click. I'll run a dial-up test at 100 yds next time before moving out to 300.
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Post by dave d. on Sept 12, 2010 17:54:10 GMT -5
 Andy 2 1/2" high at 100yrds is 4.5 moa low at 300yrds in my gun at around 2700fps.
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Post by spaniel on Sept 12, 2010 18:49:58 GMT -5
Andy 2 1/2" high at 100yrds is 4.5 moa low at 300yrds in my gun at around 2700fps. Roughly 6.5 MOA...interesting. Need to fire a full group and figure this out! Thanks... |
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Post by Richard on Sept 12, 2010 19:23:45 GMT -5
Funny, the results I have been getting are close to what dave d listed ONLY at 2900+ fps? To make sure what you are saying: sight in 2.5" + at 100 and then, using the same crosshair, aim at 300 and be 4.5" low? I checked JBM and they only list the 200 XTP and according to their program, the XTP would be 12.7 low at 300 if 2.7+ at 100. Could the SST be that much better?  Could be And my results were in inches, not MOA? Richard |
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Post by Dave W on Sept 12, 2010 19:32:16 GMT -5
Rich, Hornady lists the SST at .265 for BC. SW at one time said he felt this was close from his long range testing results.
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Post by Richard on Sept 12, 2010 20:00:16 GMT -5
Dave W........That would ;probably explain it. When I use the JBM and looked for the bullet, it only listed (at least that was all I could find) the XTP.
Richard
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Post by spaniel on Sept 12, 2010 20:07:56 GMT -5
Rich, Hornady lists the SST at .265 for BC. SW at one time said he felt this was close from his long range testing results. This would need to be a case of velocity-dependent BC...at 2100fps MV I've got a dozen deer at 200-300 yds and 4 at 300 yds + that confirm a BC around .17 at those velocities. I know they can (and do) change BC with velocity (I've seen manufacturers provide multiple BC depending on velocity) this seems like an awfully big change. I need to do two things...1) fire two groups at 100 yds with 12 MOA or so dialed up between them to confirm the clicks are 1/4 MOA, and 2) fire a real group at 300 yds. If the real drop is only around 5 MOA this gun was all the more worth the expense and effort!!! |
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Post by Dave W on Sept 12, 2010 21:17:42 GMT -5
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larry
8 Pointer
Posts: 172
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Post by larry on Sept 12, 2010 21:20:14 GMT -5
:)Tks Dave, I was trying to link my targets ,not the entire thread.
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Post by tar12 on Sept 12, 2010 21:58:38 GMT -5
:)Tks Dave, I was trying to link my targets ,not the entire thread. Where have you been hiding? |
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Post by rbinar on Sept 13, 2010 2:24:22 GMT -5
8-)This post reminds me of what SW and I wrote about the 200 grain SST/SW years ago when 45 caliber shooting first began.
He and I both noted that the drop at range was generally less than predicted using a suggested BC (I think then it was .21) and generic ballistic program
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Post by rangeball on Sept 13, 2010 13:28:42 GMT -5
I've always wondered about the 200sw advertised bc. .265 is a pretty big jump from the 195gr barnes advertised at .17ish, and it's hard to imagine the tip on the sw is providing that big a BC bump. Do you think the actual BC of the barnes is higher than advertised?
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Post by spaniel on Sept 13, 2010 13:39:43 GMT -5
I've always wondered about the 200sw advertised bc. .265 is a pretty big jump from the 195gr barnes advertised at .17ish, and it's hard to imagine the tip on the sw is providing that big a BC bump. Do you think the actual BC of the barnes is higher than advertised? With BP, .17 was my back-calculated BC for the 200SW at 2000-2100 fps MV. When I enter .265 into the JBM calculator, I get a trajectory much closer to what I observed yesterday for 2770 fps MV. Seems like a huge jump in BC given the velocity difference, to me. I'll try to get out tonight and confirm my observations. |
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Post by rangeball on Sept 13, 2010 13:58:21 GMT -5
Maybe barnes advertises based on the lower velocity BC?
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larry
8 Pointer
Posts: 172
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Post by larry on Sept 13, 2010 14:02:59 GMT -5
:)Somehow I deleted the targets when transferring the above post by Dave W. 2in. high at 100 =Zero at 180 and -13.5 at 300.   Hope this helps. Larry |
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Post by Chris Champion on Sept 13, 2010 14:52:39 GMT -5
For me the Barnes and the SST are pretty close. I shoot the 200 SST & 195 Barnes at 2750 FPS and at +3" at 100 yds they are both about -11" low at 300. The SST may shoot just a fuzz flatter but I can't shoot the difference at 300 yds.
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Post by rangeball on Sept 13, 2010 15:28:53 GMT -5
For me the Barnes and the SST are pretty close. I shoot the 200 SST & 195 Barnes at 2750 FPS and at +3" at 100 yds they are both about -11" low at 300. The SST may shoot just a fuzz flatter but I can't shoot the difference at 300 yds. Thanks. I wonder how Dave D's shoots so much flatter than others at similar velocity? |
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Post by edge on Sept 13, 2010 16:43:22 GMT -5
Thanks. I wonder how Dave D's shoots so much flatter than others at similar velocity? I think that you misread dave d.'s post. he is 4.5 MOA low @ 300 which is about 14 inches. I think that this is right in the ballpark with most of those reporting. edge. |
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Post by shooter on Sept 13, 2010 20:56:26 GMT -5
Thanks. I wonder how Dave D's shoots so much flatter than others at similar velocity? I think that you misread dave d.'s post. he is 4.5 MOA low @ 300 which is about 14 inches. I think that this is right in the ballpark with most of those reporting. edge. Edge,my finding is the same as Dave.d.I am 2 inches high at 100 and 1inch low at 200 and 13.5 inches low at 300 I dille my scope up 4.5 mint when go to 300. |
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Post by spaniel on Sept 14, 2010 5:48:38 GMT -5
Too much wind and not enough time yesterday. Now I'm off to Europe so it's going to be awhile before I determine my definitive answer on this...
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Post by rangeball on Sept 14, 2010 8:50:50 GMT -5
Thanks. I wonder how Dave D's shoots so much flatter than others at similar velocity? I think that you misread dave d.'s post. he is 4.5 MOA low @ 300 which is about 14 inches. I think that this is right in the ballpark with most of those reporting. edge. You appear to be correct Thanks. |
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Deleted
Deleted Member
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Post by Deleted on Sept 14, 2010 12:12:27 GMT -5
Last night at the range shot a 3 shot group at 300yds. 60gns H4198 / 200 SST approx 2600fps....1" high at 200...13" low at 300yds
Zen
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Post by dave d. on Sept 14, 2010 14:17:31 GMT -5
it's been awhile since I ran the numbers but I think the sst had a bc of .21. Does this work with the programs guys?
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Post by rangeball on Sept 14, 2010 14:56:43 GMT -5
it's been awhile since I ran the numbers but I think the sst had a bc of .21. Does this work with the programs guys? Using jbm online with a bc of .21 and 2700 fps, with a 200yd zero I get 2.5" high at 100yds, and 12.1" low at 300 yards. You seem to be mighty close |
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Post by spaniel on Oct 11, 2010 17:45:35 GMT -5
OK, I FINALLY got back out to test this again today.
Unfortunately, it was good news and bad news. The bad news is that in taking a few shots at 100 yds I could tell a) I need to clean my barrel, and b) my ventliner was starting to go (soot all over primer carriers). The gun was not shooting as consistently as it should.
Not having time to go pull the plug and swap liners and still shoot tonight, I decided to fire my last 4 shots at 300 yards to at least get an idea where I was. I ended up with a 3.75" 4-shot group centered 5 MOA low, I'm pretty confident in this now. I can't make the numbers work quite right on the calculator but with drops like that I don't care either!!!
Off to swap liners before I'm back on Daddy duty.
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Andy 2 1/2" high at 100yrds is 4.5 moa low at 300yrds in my gun at around 2700fps.
Could be 
