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.300 Winchester Magum Bullet Choice - Expanded

 
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  #15  
Old 01-16-2006, 10:44 AM
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Location: Woodbine, MD
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Re: .300 Winchester Magum Bullet Choice - Expanded

Jon,

Thanks for the suggestions, and for taking the time to reply.

I'm with you, I really thought it was some kind of Garbage-in,garbage-out problem, and as you said, normally, one would be happy just to have a functioning, real-world drop chart... but I want to know WHY, dammit.

Yep, this is a perfect example of why there's NO SUBSTITUTE for shooting your Rifle/load/scope combo EVERY HUNDRED YARDS,(or 50 if you can)- and logging the dope in your data book. Change any one of those three elements, and you need to chuck your data book, and start a new one.

I'm using 1:10 twist, pretty standard.

I have checked the scope reticle against a long ruler @ 100yds, measured with a 100-foot tape, not a LRF, although the LRF did agree with the tape. The MOA reticle subtends exactly 1-inch per hundred yards. I also held the rifle steady on a bipod and rear bag, while my son cranked in elevation, 4 clicks at a time, it tracks right with the ruler, all the way to 45 inches/SMOA, which is all the usable adjustment I have past my 100-yd zero. Repeated several times to be sure, going up, coming down, etc. I feel confident about the adjustments.

I am pretty confident about my weather data, I use a Kestrel 4000, which outputs directly to density altitude, if you want it to, saving the computations... I have checked it against 2 other Kestrels, and against the weather station at the school 1/2 mi down the road, via the "Weatherbug" program (pretty handy), and it's good. A thousand-foot change in density altitude only changes the impact about .5 MOA at 1000 yds, not nearly enough of a factor to explain the discrepancy here.

You're right, it almost has to be my chrony data. I have, of course, had wild readings, especially in "weird" light, but usually just 1 shot here and there, so high or low, I knew it was an error, and discounted it. Never got the feeling it was "consistently" reading high (or low)... but what else could it be......?

I think you are correct,that I am dealing with a couple of factors that stack up in the same direction- that the (advertised) BC is a bit optomistic, and my chrony readings are a bit optomistic as well.....

I have been shooting the Bergers, because they shoot so much flatter (25.75 SMOA @ 1000), buck the wind so well (6.0 SMOA @ 1000, with a 10mph full-value wind), and lately, I have been shooting more matches, than I have been hunting. The most fun are the unknown distance matches, no LRF's, no sighters, first shot is for score.... and those slick Bergers are a great mistake eraser, because errors in range estimation, or wind estimation, are lessened. "Shoot right through it", as they say...

But those Ballistic Tips just KILL STUFF DEAD, and I like using them for hunting, but I just haven't had the confidence with them, because I couldn't resolve the dicrepancies we have been discussing.

Thanks again for your time, you're helping me get to the bottom of it, always helps to get a fresh take on it. I'm going to try another chrony side-by side with mine, if I can, and with more than one gun.

Sorry if we've hijacked the thread, the discussion seems somewhat relevant to the bullets that were asked about.

Stay safe, and good shooting!

marc
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  #16  
Old 01-16-2006, 11:57 AM
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Join Date: Jan 2006
Posts: 14
Re: .300 Winchester Magum Bullet Choice - Expanded

300winnie-for what it is worth the first bullet that I would work with out of that group is by far the 168 TX.

This is one super bullet and I can find no flies on it as far as accuracy goes and the performance on game from yotes to elk has been steelar.

Good luck

Mark D

On a side I would also work up a 168 MK load and do a ton load of work with it. It is a fair bit cheaper to run a boat load of than the TX.
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  #17  
Old 01-20-2006, 08:33 AM
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Re: .300 Winchester Magum Bullet Choice - Expanded

When I'm questioning chronograph results I like to line them up end to end rather than side by side. That way they both get a read on the same bullet. That's how I found out my old Chrony was 400 fps slow.
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  #18  
Old 01-27-2006, 01:55 PM
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Re: .300 Winchester Magum Bullet Choice - Expanded

Hired we did that last summer with a couple it was quite interesting.

Mark D
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  #19  
Old 01-31-2006, 05:14 AM
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Re: .300 Winchester Magum Bullet Choice - Expanded

One more thought Marc:

Were you shooting these out of the magazine or loading them singly? My 300 will flatten plastic tips in the magazine...not a whole bunch--not anything like a lead tip bullet will flatten--but certainly enough to knock the BC down a notch or two. Enough to turn a .5 bullet into a .4 bullet. Just another possibility.

If not, back to the chrono....
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  #20  
Old 01-31-2006, 10:08 AM
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Re: .300 Winchester Magum Bullet Choice - Expanded

I shoot the 180 TXS out of a 300 wm and have found a bc. of .525 to work for me with my velocity of 3075 fps out to 1000 yards
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  #21  
Old 02-02-2006, 01:28 AM
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Re: .300 Winchester Magum Bullet Choice - Expanded

Well, I'd say there's something going on similar to what is going on with Marc--just in the opposite direction. However you came to that number, the fact is if you had substituted Sciroccos for the TSX's and done exactly the same thing, you would have come up with a .6+ BC. It would really be wonderful if it was that high...but it simply isn't.
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