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Help with .408 CheyTac & RL25

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Unread 11-14-2012, 05:11 PM
Bronze Member
Join Date: Feb 2012
Location: Colorado Springs ,Co
Posts: 94
Help with .408 CheyTac & RL25

I have been looking for data on a starting load for my custom .408 cheytac rifle. wanting to use 415gr Cutting Edge projectiles or 420gr projectiles like Rocky Mountian bullets. Not decided yet. Will be used for hunting black bear at medium to long ranges here in AZ. 500-1200yrds.

any data to start would be helpful

im gussing 120.0 to start and work up?
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Unread 01-22-2013, 09:36 PM
Junior Member
Join Date: Sep 2011
Posts: 3
Re: Help with .408 CheyTac & RL25

Im using 400 grain moly coated lehigh projectiles and couldnt find any data so i had to go through the expense of load n fire through chronograph. I just started 3 weeks ago and my tightest group so far is one and five eights inches at 400 yards thats what im zeroed at. I wanted to use 50 bmg powder and did till i had a super compressed load at 150 grains and was getting an average of 2900 fps with no pressure signs at all. I went to the next available powder which is retumbo and im at 139 grains with a bit of crater on the primer, thats where the one and five eights group came in. Im still playing with the load but my shoulder has taken an ass whooping so im gonna lay off for a couple days. My rifle was built locally by a good friend of mine, its a stiller action with a 1-13 lilja barrel and a jewel trigger, i think i will try a 1-14 next time.
Thanks wink
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Unread 01-22-2013, 10:08 PM
TH TH is offline
Silver Member
Join Date: Jan 2003
Location: Ohio
Posts: 401
Re: Help with .408 CheyTac & RL25

131 grains of reloader 25 with a 419 grain bullet is a max load in my gun. Hope this helps
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Unread 02-28-2015, 03:01 PM
Junior Member
Join Date: Feb 2015
Location: Brandon, MS
Posts: 2
Re: Help with .408 CheyTac & RL25

If it helps any, here is my set-up for the 408's we build in-house:

Stiller's TAC-408 receiver
1:14 29" PACNOR barrel (no brake installed)
Timney R700 bottom safety trigger
Baer Customs' DBM/Mag
McMillan A5 "wide body" stock (lug bedded)
419gr projectile (LeHigh or CheyTac)
505 Gibbs brass retro'ed into 408 CT
CCI LRM primers
140gr Hodgdon 50BMG
set with custom dies made by LEE Precision and crimped with one of their Factory Crimp dies.

@ 1000 yard zero, using sand bags under the forearm, we're seeing an average 5-shot group of 11.25". That was recorded with an average temp of 65 degrees, ~20% humidity, 29.95 mmHg, wind negligable, and an elevation of 400ft.
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Unread 02-28-2015, 04:11 PM
Platinum Member
Join Date: Jul 2007
Location: Arkansas (Home of Record)
Posts: 1,948
Re: Help with .408 CheyTac & RL25

What kind of velocity are you getting?
Courage is just fear that has said it's prayers.

The people trying to say the 2nd Amendment is outdated are probably the same folks that would say the same thing about the Bible.
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Unread 02-28-2015, 05:21 PM
Junior Member
Join Date: Feb 2015
Location: Brandon, MS
Posts: 2
Re: Help with .408 CheyTac & RL25

~2900 w/ SD of 17fps
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Unread 03-01-2015, 07:10 PM
Silver Member
Join Date: Mar 2013
Location: MONTANA
Posts: 130
Re: Help with .408 CheyTac & RL25

Every one of your 10 posts shows that you are a dick .... but you already knew that, right?
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