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.308 Load Development |
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deaddog
Administrator *AKA The Flying Gun* Joined: 23 April 2004 Location: Svalbard Status: Offline Points: 991201 |
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I don't think short yardage work is a waste of time. If you are working with iron sites or low power scopes I think it is a must. Since you don't have a lead sled or fancy rest it is much easier to call a pulled shot at short range. If you are the cause and not the load you may never know it at longer ranges. This is not to say long range work isn't needed. Short range can more easily weed out the lackluster performing loads. I understand that some long target bullets take some time to stabilize but you will seldom if ever see a load that will group at 200 yards and not at 50yds. DD |
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Endeavor to persevere.
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"....some long target bullets take some time to stabilize ". Got to disagree with this. I see a lot of people saying that they shoot 3' groups at 100 yards and then the bullet stablizes to a 2" group at 200 yards. Just can't happen...never. You might shoot a 2" group at 100 yards, and that has to be at least 4" at 200 yards. And the usual is it will be 5" at 200 yards with wind, etc. |
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deaddog
Administrator *AKA The Flying Gun* Joined: 23 April 2004 Location: Svalbard Status: Offline Points: 991201 |
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Ahh. The Bullsh^t flag has been thrown at me. I retract my statement."....some long target bullets take some time to stabilize ". It's been a long time since I was up to speed on my college physics and I sometimes mix up my aviation related aerodynamics which correlate but not always exactly to the gyroscopic stability of projectiles. Here's my take on it. The preccessional destabilization of a longer heavier bullet caused by gyroscopic and aerodynamic forces is more likely to be dampend out by it's greater inertia than a shorter lighter bullet. The longer one will just take more time and distance to do it. Where I've seen this isn't really group size but group location. At 25yds the group my be at the 4 o'clock position on the target and at 200yds the group may be at 10 o'clock. My deduction and that's all it is. Is that while the bullet is rotating around it's axis it is also rotating around the axis of the bore but at a much slower rate. This effect has been noticed by me more with long for caliber bullets. In my defense I never claimed larger groups shrinking to smaller at longer ranges. I'll shut up now. DD |
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24mod12
.243 Winchester Joined: 06 May 2006 Location: United States Status: Offline Points: 231 |
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Edited by 24mod12 |
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robk
.22 LongRifle Joined: 27 March 2006 Location: United States Status: Offline Points: 33 |
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being that my main hunting and shooting target is with a 308 encore i have found two powders i use which are varget and 4350 both have produced sub .5" moa. i have found that for hunting deer and smaller game or black bear i use the 150 speer 150 spbt. i played with the loads but found my best bet was at the highest load level or one grain below. i prefer to keep my loads to myself as i know each rifle will have different loads that will work for them. if you would like the loads just give me a heads up and i will get the loads for you/. varget and imr 4350 were made for the 308 caliber hope this helps rob k |
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100% disabled vietnam vet
magnus broadheads uffda ucf |
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TasunkaWitko
Administrator aka The Gipper Joined: 10 June 2003 Location: Chinook Montana Status: Offline Points: 14749 |
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hey guys - this might sound pathetic, but i still need to evaluate those laods i came up with back in frreakin' MARCH! after hunting season i am planning some weekend trips to the range as well as some laoding. the kids are pretty excited about shooting and loading right now and this is a good opportunity to do some development. robk - thanks for the offer - i'll see how these loads go and will get back to you ~ ron |
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TasunkaWitko - Chinook, Montana
Helfen, Wehren, Heilen Die Wahrheit wird euch frei machen |
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Montana Maddnes
.416 Rigby AKA Scooter Joined: 19 November 2008 Location: United States Status: Offline Points: 1799 |
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Well Taz Of course this load was developed for my rifle, and may not do crap in your. But in my Rem 788 Wincherster Brass Federal primer 42gr IMR4064 165gr Nosler Balistic Tip, or Barnes X This load works very well in mine! |
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Montana Maddness
God Bless The U.S.A. On the Highways for Jesus! |
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DD I agree with your later statement. The rotational group at various ranges is a fact, I don't think it is as wide as 4". I hear people say my gun shoots 2 inches at 100 yards, and the same rifle shoots 1.5 inches at 200 yards because of the bullet stabilizing. Physically impossible, but the gun writers keep repeatedly writing it, and it is all over the internet. |
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Irish Bird Dog
.416 Rigby Too many Joined: 01 March 2009 Location: Midwest Status: Offline Points: 5511 |
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Tas.....the Lake City Brass is military and most likely will have thicker case walls ie less powder capacity than commercial brass......not a real issue just an FYI but a military primer is crimped in place and that primer pocket usually needs to be de-crimped to fit primers back in easily. Out of the past ie HISTORY: I have an old loading "tool" called a "Powley Computer" that is a cardboard slide rule type gizmo that you can set for bullet wt, bullet dia. maybe the velocity you want etc (ain't used it in years, can't remember exactly what is entered into the data slides) but it helps find a starter powder for your load if you follow the instructions just to get you on the right track. Only thing is it is obsolete now cuz of so many newer powders since it was designed but would still work for the powders of its time. I think the guy who designed it was Homer Powley & musta been a ballistician or some such thing. Wonder if anyone else remembers about that tool. Today there must be computerized programs to use for the same info. Check with the powder companies and bullet makers. |
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Irish Bird Dog
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Tattoo
.223 Remington Joined: 24 July 2008 Status: Offline Points: 76 |
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Use 46 grains of R 15 ,150 grn bullet and forget the rest. I've shot a .308 of some kind for 40 yrs. My 99 savage will drive tacks with that load as has most other rifles I've used it in. Killed a lot of game with the load
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IBD, yep remember the Powley Calculator...and I have one! He made other calculators and I have some of those also. I undestand his wifle had a web site with some of that stuff. But is is a handly tool, just have to calibrate it with burn rates, and use it AS A GUIDE. |
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