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Re: .308 Down loads
Posted: Sat Dec 07, 2013 9:31 pm
by Rburro2
Charlotte the flyer wrote:Apparently it scares the cows!
tesnews
We also need information on downloading 7.62R to shut those nasty M44s up.
It does more than scares the cows
It scares the bull
Re: .308 Down loads
Posted: Sat Dec 07, 2013 10:10 pm
by IainWR
I do not pretend to be any sort of an authority on reloading, but it is my misfortune to have to investigate the failures, and I do know quite a bit about technical investigations.
Before you start downloading any rifle cartridge, please consider the effect of presenting a large powder surface to the primer flash. This is a critical factor in a current NRA investigation.
yours
Iain
Re: .308 Down loads
Posted: Sat Dec 07, 2013 10:38 pm
by ovenpaa
Iain, has this ever been proven? I know it is oft discussed however I have never read any conclusive reports.
Re: .308 Down loads
Posted: Sat Dec 07, 2013 11:35 pm
by tackb
I've heard a lot about this low charge idea but it sounds like it would be really easy to replicate if it was true but as yet I've never seen any proof other than speculation ?
Re: .308 Down loads
Posted: Sun Dec 08, 2013 7:25 am
by dromia
Here we go again SEE secondary explosion effect.
Once more I refer you to Prof Brownell's research.
http://www.full-bore.co.uk/viewtopic.ph ... 7&start=20
http://www.full-bore.co.uk/viewtopic.ph ... t=Brownell
Using fast pistol powders in rifle cases for reduced loads is not a cause of SEE!!!!
jjvc has given you the standard loading as per Harris and Mattern and it just plain works, Trailboss works fine but at over £50 a lb you must have more money than sense, twice amount at almost twice the price.
Re: .308 Down loads
Posted: Sun Dec 08, 2013 8:06 am
by old_n07
Agreed but if you are only using 10gr in a down loaded cartridge it works out at about 7p per load compared to around 14p when using TR140 with a full load of 40gr +
Re: .308 Down loads
Posted: Sun Dec 08, 2013 8:30 am
by old_n07
After looking at the links you posted there it also raises the question of using cast bullets which I hadn't considered either sign01
Re: .308 Down loads
Posted: Sun Dec 08, 2013 8:31 am
by dromia
Compare that to 4 gns of N310 a 1.6p per load.
Re: .308 Down loads
Posted: Sun Dec 08, 2013 8:59 am
by old_n07
sign01 just when I thought 'd settled on a powder to try :lol:
What sort of % fill would the vit give in a 308 case?
Also looking at other threads on down loads some people are drilling out flash holes, is this necessary?
Re: .308 Down loads
Posted: Sun Dec 08, 2013 9:32 am
by phaedra1106
No, use the correct powder and there's no need to. N140 is not suitable for downloaded 308s!.
As Dromia says, a fast pistol powder is ideal, I used TiteGroup and Trail Boss in 308 subsonics then switched to N310, much better results and a lot cheaper!.
Current loads are 4.9gr in .308 and 3.4gr in 300 Blackout, both using 115gr cast boolits. Both loads run around 980fps and are very accurate at 25m.