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230 gr Berger OTM Transonic

 
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  #43  
Old 12-31-2012, 06:10 AM
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Join Date: Oct 2010
Location: Norway
Posts: 69
Re: 230 gr Berger OTM Transonic

I am shooting the 230 grs Hybrid Target in my 300 win mag.
I have a Tikka T3 Super Varmint, with a Lothar Walter barrel. Twist is 1:8 and length is 26".
I use 71 grs of Viht N570 and this gives me 2747 fps. It is not a hot load, but it gives me the best groups at 100 meters.
I have found that the advertised BC is a bit low. I have tested it out 3 times now, in different conditions, and when I put every data into Applied Ballistics on my smart phone, I allways hit high. It can not be my velocity, becuse I need to dial in 3084 fps to get it right, and there is no way I have that speed.
So I have adjusted the BC up from .743 to .770. This brings me dead senter out to 1200 meters.
Is there anyone else who has come up with a different bc, than the advertised one?

Happy new year to all of you
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  #44  
Old 01-17-2013, 09:43 AM
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Join Date: Jan 2013
Posts: 47
Re: 230 gr Berger OTM Transonic

The biggest thing I notice in using "Reverse DOPE" to get speed of a projectile is that (some) shooters dont accurately measure the scope to bore height which will throw off all of your shooting calc's numbers. IE when I run "Shooter" on my GAP 300 win w/230 OTMs @ 2720 fps with the "default" input of 1.8" for scope to bore lets say at 400 meters in up 7.7 moa. Well If I correct that to what the guns scope to bore is (2.2 in) @ 400 meters it drops to 7.4 moa (what it really is.)

So... Garbage in, Garbage out. Like I think Broz was saying you cant beat hard DOPE. Once you get the settings right on "Shooter" or the like it will truely show you what speed you are throwing them at. For the Bergers I have seen theyre BC's (G7) are very reasonable so from then on out its MV, Air Den or actual Dist to Target that are your variables.

Using H1000 and the OTMs I get about 2720 fps with no pressure.

Enjoy,

BGE
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  #45  
Old 01-22-2013, 04:12 PM
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Join Date: Jan 2011
Location: Portland, OR
Posts: 177
Re: 230 gr Berger OTM Transonic

Quote:
Originally Posted by BGE541 View Post
shooters dont accurately measure the scope to bore height which will throw off all of your shooting calc's numbers
Just so that I make sure I'm on the right page here, the measurement is center of bore to center of scope, correct?
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  #46  
Old 01-22-2013, 04:25 PM
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Join Date: Jan 2013
Posts: 47
Re: 230 gr Berger OTM Transonic

Yes Sir, centerline of scope to center line of bore. I was surprised at the actual height of my scope over bore and the impact on data it had. Maybe play around with some numbers on a ballistics calculator and see what it does.

Hope it helps.
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  #47  
Old 01-22-2013, 10:23 PM
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Join Date: Jul 2010
Location: Mount vernon, OH
Posts: 671
Re: 230 gr Berger OTM Transonic

Man Berger is really on their stuff. I might have to bite the bullet and stop going cheap with my 208GR Amax. H1000 really likes the big heavy pills. What are you loads if you don't mind divulging.
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  #48  
Old 01-29-2013, 01:30 PM
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Join Date: Feb 2009
Posts: 478
Re: 230 gr Berger OTM Transonic

Quote:
Originally Posted by joe0121 View Post
Man Berger is really on their stuff. I might have to bite the bullet and stop going cheap with my 208GR Amax. H1000 really likes the big heavy pills. What are you loads if you don't mind divulging.
If you look at the beginning of the thread I have my load data. I jumped in on the thread
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  #49  
Old 02-06-2013, 12:20 PM
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Join Date: Oct 2009
Location: Pottsville, ky
Posts: 276
Re: 230 gr Berger OTM Transonic

Hey guys,
I would like to bring this thread back if I could pick yalls brain for a minute. I have 200 of the hornady 225 hpbts and about 100 of the 230 otm's. After reading here I think I will sell the 225s to someone needing something to shoot through a suppressor, and buy more otm's. OK, Here is where it gets weird. I have a 300 win in a mcree chassis with a 20" rock creek barrel. I bought this as kind of an experiment. Folding chassis+ 20" barrel= long range backpack gun. I have 200 rounds of A191 that I got with the gun. I'm getting about 2825 out of the 190gr matchkings in that load. If I'm not mistaken those are loaded with 72.3 gr of reloader 22. Anyway, I have h4831sc on hand and us869. I think the 4831sc might work in the short barrel. Can someone tell me if it would be possible to reach 2700fps with the OTM'S in a 20" barrel. I'm gona shoot this barrel for a while but I believe I will go to a 24"or 26" when I rebarrel unless this 20" really impresses me.

Thanks
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