The heaviest 550 gr for Extreme ELR probably be best 8 to 1 twist , in 416 caliber bullet, and 520 gr 9.5 to 1, and 470gr 10 to one, Some barrels I picked up are 10 to 1.......
Now a novel idea is to lighten rear of bullet with small shallow hole drilled in base, might do better long range.which would allow 10 to one barrel stabilize the heavier 550 gr bullets for ELR. Making bullet nose heavier makes it more stable in flight, needing less spin, like our hollow base 585 cal minie bullets only need 48 to 1 twist, or less while out regular 585 bullets need about 24 to 1 to stabilise them..............
The winner of the King Of 2 Mile shoot last week was using 416 Barrett with a 1 to 10 twist, with a 500 gr CEB Lazer bullet, ...Robert Brantley, with Manners Stocks....
Paul Philips was third with a 416...
GOOD NEWS-- There is now an importer and seller of our 585 HE brass getting set up here, in US, hopefully will be in stock, few weeks........ http://bertrambrass.com .. .. Caleb Hallet..
Have got another intermediate size action besides the Montana PH our guys working on, to do speed testingwith. It is big long REM style action that can take our 416 HSM, ED
Posts: 393 | From: Brinton(Mail Lake),MI-USA | Registered: Sep 2000
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Away for a time, sickness.. Here is print with chamber reamer specs for the 416 HSM chamber..There are 3 base sizes we have, depending on actions used. Got reamers for all 3.. Got cases for all of them.. Our cases are public domain, so that is why I post info and specs. To help guys do their own setups. Manson makes reamers I use,,, Ed. Posts: 393 | From: Brinton(Mail Lake),MI-USA | Registered: Sep 2000
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Here is reamer print with chamber reamer specs for the 460 HSM chamber .Couple guys getting set to do 38-40 inch heavy 458 target barrels...Ed.... Posts: 393 | From: Brinton(Mail Lake),MI-USA | Registered: Sep 2000
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