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input on 6mm something or other coyote rig build

 
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  #36  
Old 12-27-2012, 09:57 PM
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Re: input on 6mm something or other coyote rig build

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Originally Posted by cruizer View Post
Abandon the 6mm and go with a 25-06 or 25-06ackley with 87 gr bullet and jump up to 120's for deer
Thanks for the opinion but anything a .25 with 120's will do my 7STW with 168's will match. This 6 will be strictly a predator gun
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  #37  
Old 12-27-2012, 10:13 PM
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Re: input on 6mm something or other coyote rig build

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Originally Posted by Scot E View Post
It's a lot of fun playing with burner cartridges so I don't want to talk you out of that if that is what you are looking for but I would encourage you to compare ballistics on the differences between a fast 87 grainer doing 3700 or so (reaching that is possible but not easy) and the 105-115 grainers going 3-3300 fps (which is pretty easily attainable.

You will get flatter trajectory out to the distances you mentioned but you will pay for it in a lot more powder being burnt, much less barrel life and you will sacrifice wind drift and possibly accuracy. To my way of thinking elevation is easily accounted for with a good ballistic chart, turrets or a good ballistic reticle. But wind drift is a different story. No matter how big you go I would suggest you look at the heavy for caliber bullets.

I do think there is a point of diminishing returns for each caliber and I think we pass it with the 6mm by going to the 6-284 and bigger. Maybe that isn't a big issue to you but with my smaller caliber guns I go through a lot more ammo than my bigger guns.

I think you would be hard pressed to go wrong with the following:

6x47, 6mm Creedmore, or the 6XC. You should easily get 3000 fps with the XC and another 200+ with the others. There is great brass available for all of them and they all have shown to be very accurate and easy to load for. The XC is based off the 22-250 case so you could use your current stock of cases for it as well but there would be some forming involved.

Sounds like a fun project. Good luck in your decision!

Scot E.
Scot, you make valid points and turrets, charts and reticles serve their purpose, I frequently use all of the above on foraging game that will mosey around with head in grass. Coyotes rarely stand still so flat and fast is the goal. I have been shooting 40 grainers out of my .22-250 @ nearly 4k fps and this is a replacement build for that rifle. The 6mm in 80 grain and up already gives a better BC and less wind drift than my 250 and if pushed fast enough not much loss on drop. I know barrel life is the trade off and am ok with that. If accuracy is an issue I will readily admit you warned me! Lol
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An unarmed man can only flee from Evil and Evil is not overcome by fleeing it.

The proper use of a Pistol is to fight your way back to where you left your Rifle.

The best gun to have? ... The one in your hand when the fight starts!

Respect All - Fear None
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  #38  
Old 12-27-2012, 10:32 PM
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Re: input on 6mm something or other coyote rig build

Quote:
Originally Posted by Lyons7STW View Post
Scot, you make valid points and turrets, charts and reticles serve their purpose, I frequently use all of the above on foraging game that will mosey around with head in grass. Coyotes rarely stand still so flat and fast is the goal. I have been shooting 40 grainers out of my .22-250 @ nearly 4k fps and this is a replacement build for that rifle. The 6mm in 80 grain and up already gives a better BC and less wind drift than my 250 and if pushed fast enough not much loss on drop. I know barrel life is the trade off and am ok with that. If accuracy is an issue I will readily admit you warned me! Lol
I originally said a 6-284 would be te ticket and still think it is but......here goes somethin nutty. A big 20 of some sort with the berger 55gr. Ive been looking at that combo asthe ultimate varmint gun. The 55gr bc and sd are off the chart. There is no recoil and itll shoot flatter than anything out there. 6" low at 400 with a 1.75" high at 100 sight in. 16" at 500. And bucks the wind. Just a thought and I hate it when someone posts off topic but with the advent ofthe 55 it changes things. And Ive seen deer killed with the 40gr stuff so Im ok with it on yotes.
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  #39  
Old 12-28-2012, 09:57 AM
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Join Date: Feb 2010
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Re: input on 6mm something or other coyote rig build

Quote:
Originally Posted by toddc View Post
I originally said a 6-284 would be te ticket and still think it is but......here goes somethin nutty. A big 20 of some sort with the berger 55gr. Ive been looking at that combo asthe ultimate varmint gun. The 55gr bc and sd are off the chart. There is no recoil and itll shoot flatter than anything out there. 6" low at 400 with a 1.75" high at 100 sight in. 16" at 500. And bucks the wind. Just a thought and I hate it when someone posts off topic but with the advent ofthe 55 it changes things. And Ive seen deer killed with the 40gr stuff so Im ok with it on yotes.

I still have to vote 6-284. Fast, Flat & has a 1000yd title to it's name. The 55grain 20cal Berger does have some merit (.381 G1) but I feel somewhat hesitant to build my rifle around one bullet. Just my luck, it wouldn't shoot fer chit Then i'd be stuck with 40 grainers... I do agree the SD should be great... I wonder just how fast a guy could push'em


t
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  #40  
Old 12-28-2012, 11:54 AM
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Join Date: Jun 2010
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Re: input on 6mm something or other coyote rig build

Quote:
Originally Posted by toddc View Post
I originally said a 6-284 would be te ticket and still think it is but......here goes somethin nutty. A big 20 of some sort with the berger 55gr. Ive been looking at that combo asthe ultimate varmint gun. The 55gr bc and sd are off the chart. There is no recoil and itll shoot flatter than anything out there. 6" low at 400 with a 1.75" high at 100 sight in. 16" at 500. And bucks the wind. Just a thought and I hate it when someone posts off topic but with the advent ofthe 55 it changes things. And Ive seen deer killed with the 40gr stuff so Im ok with it on yotes.
setting right in front of me right now is a sketch I made of a 6.8 SPC case necked down to 20 caliber. 1.28" at the shoulder with a 30 degree shoulder angle. The over all length is 1.65". I also have a similar design done off a 35 remington case that has a shoulder length of 1.343" at the shoulder with a 30 degree angle. Over all length is 1. 688. Taper on both rounds is .012" per inch. The first round started out using .225 Winchester brass, but after somebody gave me a handfull of 6.8 cases I knew I found a better case to start out with. Have not gave much thought about the throat angle and length, but both rounds will be done to shoot the 50 grain bullets. (if I ever find the time and a good donor action on the cheap)
gary
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  #41  
Old 01-06-2013, 09:22 PM
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Join Date: Sep 2011
Location: East Texas
Posts: 225
Re: input on 6mm something or other coyote rig build

It has come down to 6-06 or the 6-284. I have access to lots of .270 and 06 cases so that may be the winner.
__________________
An unarmed man can only flee from Evil and Evil is not overcome by fleeing it.

The proper use of a Pistol is to fight your way back to where you left your Rifle.

The best gun to have? ... The one in your hand when the fight starts!

Respect All - Fear None
Reply With Quote
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