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270 and 7mm Wildcats Sub sonic

 
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  #8  
Old 11-10-2006, 11:10 AM
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Re: 270 and 7mm Wildcats Sub sonic

Kirby

points well taken as always.

However when I think about a subsonic round i am generally thinking 500yrds and less. At that distance the wind drift advantage that the 7mm has is small, however the retained energy of the 338 is alot greater.

Just depends on what the intended gun will be used for I guess(as it always is)

Again good points, what does the numbers look like with the 350 gr wildcat vs the 200 gr wildcat?

d-a
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  #9  
Old 11-10-2006, 03:03 PM
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Re: 270 and 7mm Wildcats Sub sonic

Perhaps a good project for a 1 in 7 Lilja - 3 groove [img]/ubbthreads/images/graemlins/grin.gif[/img] [img]/ubbthreads/images/graemlins/grin.gif[/img]?

Would it be worth a try?
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  #10  
Old 11-10-2006, 10:18 PM
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Re: 270 and 7mm Wildcats Sub sonic

It is realy a hard decision when you get into specilised calibres but the thing i want to do is fit it into an AR MAg i could go with the 338 and use a M14 MAg as i will be building it on a Rem 700 Short action and the bolt face is not an issue i will just open the bolt face myself not an issue. I also have a 223 action as a donor so either is no issue as i would fit a tubb 2000 extractor. The thing is the lack of recoil it will have a Flash Supressor but not a silencer as the problems associated with a licence here in Australia is rediculas. Their is also Richards 195ULD projectile in 270 and that would laos be a very good performer and be a standard calibre. But i could also do a 30BR and use the new heavy 30 cal Wildcats. Originaly i was looking at using a 22 cal but the energy would not be enough for Pigs and Goats that would be the upper level i will be using it for. Also with sub sonic projectiles they seem to tumble and cut like a knofe instead of mushrooming like high velicity ones do so the longer the projectile the better. Teh other thing is the 338's have the 350gr Wildcats aswell as the 300's and the 300gr MAtchKings but the 270 and 7mm projectiles are a lot cheaper. I will also be building a 7mm and hopefuly be using the 200gr projectiles for it as a target rifle if it all works out so i could use 1 type of projectile for 2 rifles but i also have a 338 i am building right now so that is also a viable option but a detachable mag will be a lot heavier and bulkier. I am leaning towards a 7mmSPC throated to suit an AR15 type mag length and use the fastes twist barrel i can get 17" long. I wil likely use another A5L but the standard type not the oversize one i have coming for my 338. I would also be awsome in 338BR as the 2 rifles one large one small both the same stocks bore dimentions and also stock color. But the 7mm would be more practical. Richard sugested the 195gr 270 in the 6.8 would be a good calibre and if it worked i would only require 1 projectile anyway.

Cheers Bill
Thanks for your opinions
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  #11  
Old 11-12-2006, 12:56 PM
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Re: 270 and 7mm Wildcats Sub sonic

Bill

how hard is it for you to get the 6.8 spc brass? the bullets and powder will be the same.

d-a
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  #12  
Old 11-12-2006, 06:37 PM
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Re: 270 and 7mm Wildcats Sub sonic

hi d-a i have 200 spc cases here at the moment am doing an article for an Australian hunting magazine on one. The REm cases are readily available here and i also have the Rem Bulk 115gr projectiles. with a 135gr MatchKing the 6.8SPC can get 2600fps from a 20" barrel not to bad for a little round. I would not use this load in an AR but in a bolt action their are no problems at all. i would rather a small rifle primer in them though but if using fast powders with sub sonic velocity i would likely be using pistol primers as the pockets are shallow.

Cheers Bill
Australia
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  #13  
Old 11-17-2006, 08:01 PM
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Re: 270 and 7mm Wildcats Sub sonic

I have missed a great option if using the 7mm Projectiles as a factory chambering. The 7mmBR with a fast rifle powder it would have a good capacity for the 200gr Wildcat ULD and it would also double with the light varmint type projectiles.

What do you think. Just want to be able to use detachable mags on this project.

Cheers Bill
Australia
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  #14  
Old 11-17-2006, 09:41 PM
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Re: 270 and 7mm Wildcats Sub sonic

bill

you can do alot off of the BR case. 7mm to 50 cal subsonics.

d-a
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