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6.5 Creedmoor

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Re: 6.5 Creedmoor
« Reply #15 on: March 18, 2016, 11:24:00 AM »
 

Kirk.PRM

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I'm at 44.5 of h4350 woth Berger 140 hybrids. No pressure signs shoots alright. My barrel on the Creedmoor is on its way out.


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Re: 6.5 Creedmoor
« Reply #16 on: March 20, 2016, 06:18:34 AM »
 

greenlightjay

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Well, I decided to go with 41.5 grains of IMR 4350 on my 6.5 Creedmoor Ruger precision rifle. Had velocities of 2602, 2608, and 2626, with a 1/2 inch spread at 100 yards. COL of 2.846, 140 ELD-M bullet, new Hornady brass. Started at 40 grains, did .3 increments up to 41.7. The rounds that I loaded with 35.2 grs of 4064 averaged at 2460 ft/sec.
 

Re: 6.5 Creedmoor
« Reply #17 on: May 02, 2016, 06:39:23 PM »
 

tlshores

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Is it safe to start at 41 grains? I'm reading on Snipers Hide that they are starting at 41 and going up to 43 or 44 grains, what's the advantage to such a hot load?

Is it safe?,..... depends.
I saw a strange pressure/velocity jump in my H4350 load development that I still haven't explained.
I started at 37 and worked up to 41 with a Lapua 136 Scenar in Nosler brass.
At 41 (max for 140s in Nosler manual) I was still about 50 fps below where I thought I should be.
I decided to go a little hotter and pushed the powder up to 41.5 to try to get the load to 2700.
At 41.5, I was still only at 2660. No pressure signs so I loaded some rounds to 41.7
Suddenly I was pushing 2800 and getting sticky bolt lift.
Clearly these loads were too hot in my gun.
I don't really understand why the pressure/velocity curve didn't really correspond more closely to the incremental increases in powder.
Velocity actually spiked big time jumping 140 fps with only a 0.2 powder increase.

Based on what I experienced, I'd say anyone that's advocating starting at 41 and go up to 43 - 44 grains is living dangerously.
Work up from 10% back of max and if your rifle tells you its safe to go farther, fine, but do it with caution.

What's the advantage to a hot load?
Simple,.... velocity yields less wind drift and less time to target decreases lead on movers.
Flatter trajectory means less bullet drop and makes minor distance errors more forgiving.
If your bullet is dropping like a mortar round, a few yards off on the distance matters.
Precision Long Range shooters are always pushing the envelope to try and get a competitive edge.
« Last Edit: May 02, 2016, 07:06:17 PM by tlshores »
 

Re: 6.5 Creedmoor
« Reply #18 on: May 14, 2016, 05:35:27 PM »
 

WildManPiet

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OK folks...   Not exactly the same but finally got a 6.5CM together and started testing.  It is a RPR running a LRI 26" AMAX barrel.   I have been doing load development (not necessarily the smartest way but lots of speed data) on IMR4064  H4350 and IMR4451 with the 140gr ELD-M and virgin Hornady brass.   All with a magnetospeed, some with a can some with just the brake.   I am trying for/getting much higher speeds...  2600fps seems way too slow to me.
There is Hornady match AMAX 140gr tests in there so there are some control groups for reference.

https://drive.google.com/open?id=0B-sQh0WyHxLSQ2RTa3pHV0hZTkE


If you want to see more find me on facebook as I posted it all there already.   Greg Piet
 

Re: 6.5 Creedmoor
« Reply #19 on: June 14, 2017, 08:52:22 AM »
 

Extortion

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140 Hybrids
Hornady brass
Federal 210 primers
42.9 H4350
Gets me an AV of 2830
SD 3
ES 10

Out of a 24" Bartlein.
Wow!!  Hodgdon calls for a max (compressed) load of 40.0gr for a 140 A-max pills.  Do you get any pressure signs from that?  How is your accuracy?

I've never compressed a load of 4350 and I run 42.8grs with my 140s.
It pays to be a winner.
 

Re: 6.5 Creedmoor
« Reply #20 on: June 14, 2017, 10:35:58 PM »
 

Jeff M

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140 Hybrids
Hornady brass
Federal 210 primers
42.9 H4350
Gets me an AV of 2830
SD 3
ES 10

Out of a 24" Bartlein.
Wow!!  Hodgdon calls for a max (compressed) load of 40.0gr for a 140 A-max pills.  Do you get any pressure signs from that?  How is your accuracy?

I've never compressed a load of 4350 and I run 42.8grs with my 140s.

I'm thinking the Hodgdon book also calls for a MUCH shorter OAL than many of you guys are running.

With respect to is 40gn (yes, gn, not gr - gr is grams) safe - I shoot a 6.5x47 and my load is 40.5, so...
Every time you make a typo, the errorists win.