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.308 WIN Spindrift?

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Unread 09-03-2008, 05:35 PM
Gold Member
Join Date: Mar 2008
Location: clearfield county , Pa
Posts: 762
Re: .308 WIN Spindrift?

Nonya , I'm very new to long distance shooting , so please don't take this the wrong way . this is just something I fought with and thought it could be a problem your having .
as my shots got longer my P. O .I . would go to the right . the longer the shot the more right I hit . I was messing with it one day at the range and a guy asked what I was doing . I told him and spin drift was his answer to my problem . but to make a long story short . my scope was not straight . as I went to a longer distance , I used a different ballistic mark . when I did that I got added windage from the reticle being tilted . and this should be true if you dial your elevation too .
again I'm very new to this and I went through this not long ago . I thought it could be something you overlooked ,if not sorry for butting in . Jim
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Unread 09-03-2008, 07:55 PM
Platinum Member
Join Date: Jan 2004
Location: Blackfoot, Idaho
Posts: 8,831
Re: .308 WIN Spindrift?


Well I'll be darn'd. Its whatcha don't know that get ya and I didn't know. I just figured it took care of itself during the sight in and drop chart development.

However, I do rotate the scope after I've plumbed it with strings levels and such if its necessary when elevation is raised. I'll be shooting to 1k shortly and will watch for what you described.
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Unread 09-03-2008, 08:16 PM
Join Date: Sep 2007
Location: Near Helena Montana
Posts: 655
Re: .308 WIN Spindrift?

Thanx for the links and the usefull data.I downloaded the program and the data I got from it almost matched my results EXACTLY. I was shooting in 0 wind down a canyon last sat and from 700 out I was noticing a right side drift,shooting bug holes at 100 and then moving right past 700.Seems spindrift does exist and there have been extensive tests to prove it,it varies from round to round but is always a factor.
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Unread 09-03-2008, 09:05 PM
Silver Member
Join Date: Jan 2006
Location: Skagit Valley WASHINGTON
Posts: 160
Re: .308 WIN Spindrift?

I am fortunate to have shot quite a bit at 1k over the past several months and can say that it does exist on every gun we have shot at that distance. EVERY shot has been to the right unless left MOA has been dialed in to correct it. This is in a gravel pit with high banks on boths sides making the wind have little or no effect. We have shot at all times of day with all different wind situations and the result is always the same - right of POA. All scopes have been painstakingly leveled with the action with levels, plum lines, feeler guages, etc. My conclusion is, and I am no expert, is either you sight it in left of POA to begin with (between 1 - 2 MOA), or you remember to dial it in at distance. I would also say not only does it vary round to round, but also from what we have seen rifle to rifle.
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