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Post by manofsteel on Jan 24, 2018 14:16:49 GMT -7
In an attempt to have a SH discussion without getting all the cow pies from the hide, when you are working on a new load/caliber decision and you are crunching data on JBM ballistics, what is more important to you:
Heavier (slower) bullet with less wind drift but more drop in trajectory or a faster lighter bullet with less drop in trajectory but more wind drift?
Ive been playing with some lighter RDF bullets that are fast and only giving me 6 mil hold at 1k yards but in a 20mph wind there are 4 mils of drift at that distance.
Thoughts?
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Post by spartan260 on Jan 24, 2018 16:23:13 GMT -7
You need to analyze the type of shooting you are doing. What yardage are the majority of your shots taken from? Is your average shot 400 yards or 800 yards? Will most of your shots be taken from prone or will it be a mix of prone and positional shots?
My $0.02 is that if you are shooting primarily from prone, bigger is always better. However, there is a trade-off, heavy bullets will exploit your weaknesses. Any deviation from perfect trigger control and followthrough shows up more the slower and heavier the bullet is. If you are shooting off an unstable barricade at 380 yards a light and fast bullet is better: less recoil, flatter trajectory, the bullet leaves the barrel faster. There is less time for your negative inputs to influence the shot.
How much better is it, probably very little. Long range shooting is a game of numbers, anything you can do to sway the numbers in your favor, do it. The money shots at almost every match are the 300-500 yard positional shots, that's where you pick up your points. If that's the type of shooting you are trying to do, I say go with the lighter faster bullet.
Just my opinion, curious what other people think about this though.
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Post by rbglock on Jan 24, 2018 16:37:56 GMT -7
Any thought of 20 mph winds is *completely * unrealistic, you are in Wyoming, after all.  Back to your point, I've been rethinking bullets weights too. I like the heavies with the high BC's, but I can also see Frank Galli's point about the lighter bullets. The less time they spend in the air, the less time the wind can affect their flight. On the other hand, more velocity usually means more throat erosion. How often do you want to change barrels? |
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Post by jmglasgow on Jan 24, 2018 19:49:38 GMT -7
I've been leaning toward switching to a lighter bullet as well. Probably going to try the Berger 130 AR Hybrid. Supposedly it isn't jump sensitive so throat erosion should be less of a factor, especially when loading to mag length. If there are lighter, less expensive bullets that aren't jump sensitive I'd try those as well. I do like the heavier bullets for impact energy down range, it makes it easier to spot hits at long range.
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Post by manofsteel on Jan 25, 2018 8:06:51 GMT -7
I've been looking at the 224 valkyrie however Ive been playing with the 70g RDF and I am getting better performance out of a 223 than what the valkyrie offers.
Also I can buy the 140 and soon the 130g RDF bullets for like $25 per 100. Not sure if they are jump sensitive but on the computer the 130's look about as good as the 6mm stuff (some not all).
Spartain, you bring up a great point about looking at what ranges you are going to be shooting in most of the time.
With the addition of the 1k berm I feel like our entire match dynamic has now changed (for the better) but now I feel that I am looking for something going faster so that my holds are more forgiving....but...given that we shoot in a windy valley with changing holds at each berm do you think that it is worth it to find a load that has a strength in speed or one that bucks the wind better.
Ill add that my 70 rdf load has a 6.8mil hold at 1k but a 2.04mil hold in a 10 mph wind
My 123g load that is NOT an RDF bullet is a 7.6 mil hold at 1k with 1.7mil hold in a 10mph wind
and the 130g RDF load would have 7.05 mil hold at 1k and 1.43 mil hold in a 10mph wind.
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Post by tom on Jan 25, 2018 8:09:32 GMT -7
.45-70 and call it good.
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wyzrd
Junior Member
Posts: 73 
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Post by wyzrd on Jan 25, 2018 15:52:11 GMT -7
I vote for the barrel burning 28 nosler shooting the 195 gr Bergers! HaHa! Sorry man, I know you’re talking about match friendly rds. I just recently got into a 6.5CM that I’ll be using in the matches, and am debating this same thing, so I’m definitely curious to hear others take on this. I’m undecided between 140 gr Winchester Match BTHP, or Federals 130 gr Berger Hybrid OTM (both factory loads). So far I’ve gotten good groups with both, but I like having that little bit of extra velocity. Less airtime!
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Post by jmglasgow on Jan 25, 2018 17:39:07 GMT -7
That Winchester 140 factory ammo is pretty slow in my rifle. Federal match has always been good in anything I've shot it in
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wyzrd
Junior Member
Posts: 73
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Post by wyzrd on Jan 28, 2018 7:02:36 GMT -7
Yeah, I still have to run these loads through the chrono, but it’s gonna be hard for me to decide because I got pretty decent accuracy with both. They were the first rds out of my rifle and each load grouped right at 1/2 moa with zero break in. I’ll be hitting the range again hopefully this coming weekend, and will run each through the chrono. If the accuracy stays consistent, more than likely I’ll just stick with the 130 gr then.
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