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Hi

 

Has anyone any experience of having copper projectiles machined in small batches, of say 2000? Thinking bar fed CNC. Looking for around 10 mic of total runout, surface profile also of 10 mic and Ra of 0.8  Will supply nominal supplied CAD data in STP

 

I am looking to make 150 grain very high BC. 308  bullets with a long COAL 

 

Cheers 

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Many of us use Lathe Turned Solids (LTS) here

 

Either for deer or target on field firing ranges.

GS Custom being my preferred provider, others use Warner Flatlines, Barnes etc

A 150 g LTS will be very long and will probablty require a gain twist barrel to avoid damage to the outer surface

 

There is (was) a guy in the UK who makes LTS Bernie Montanna - not sure if he is still having them made, perhaps seek him out

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Try this website for GSC bullets.  Johan is very helpful. 

http://www.t2ammo.com/index.php/GS_Custom

I suggest you use TransferWise to pay, cheaper than a bank and very reliable.

https://transferwise.com/

There are no import restrictions on expanding ammunition since the change of law regarding posting between individuals.

I recommend a charge based test to get a series (two!) of horizontal groups. 

Explained here.  Please note:  It's nothing to do with the bullet holes being in a horizontal line, rather the relationship between adjacent groups.

http://forum.accurateshooter.com/threads/long-range-load-development-at-100-yards.3814361/

Gerard Shultz recommends a 0.5 or 1.00mm (0.039 370 078 74") spacing for initial COAL testing.  I found this too coarse and jumped right over the node.

Run a series of bullet length tests at 0.006" intervals reduce this down to 0.003 when you have an indication that you're getting somewhere.

I found these bullets to need at least 0.100" stand off, so you could start there.

I found I got lots of advice on what other people do, but not much on HOW.  I hope this helps.

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