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Discussion Starter · #1 ·
I’m struggling with a ladder workup on my AR10 .308!

This is what I’m trying to do:
1: Ladder test workup for IMR4064 and Hornady 30 Cal 165 gr BTSP Interlock bullets.
2: Ladder test workup for IMR4895 and Hornady 30 Cal 165 gr BTSP Interlock bullets.

I have: AR10, .308, 20” midweight barrel, 1:10 twist

My problem is that the books are giving me significantly different load data.
IMR4064
Lyman 39.0 - 44.5 gr
Hodgen 42.0 – 46.3 gr
IMR4895
Lyman 38.0 – 43.2 gr
Hodgen 42.7 – 45.5 gr

What have you had success with using these bullets and powders?
Thanks in advance!
 

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I’m struggling with a ladder workup on my AR10 .308!

This is what I’m trying to do:
1: Ladder test workup for IMR4064 and Hornady 30 Cal 165 gr BTSP Interlock bullets.
2: Ladder test workup for IMR4895 and Hornady 30 Cal 165 gr BTSP Interlock bullets.

I have: AR10, .308, 20” midweight barrel, 1:10 twist

My problem is that the books are giving me significantly different load data.
IMR4064
Lyman 39.0 - 44.5 gr
Hodgen 42.0 – 46.3 gr
IMR4895
Lyman 38.0 – 43.2 gr
Hodgen 42.7 – 45.5 gr

What have you had success with using these bullets and powders?
Thanks in advance!
I had 3 .308's at one time and the sweet spot for the three ranged around 42.6 to 43.2gr of 4064 but I was using 175SMKs exclusively. There are gong to be differences pressures experienced based on different case capacities and other factors so the best thing to do is a pressure test and see where the pressure signs start. Cratered primers, shinny spots on base etc. Once you see that, time to stop and do your load development between those ranges.

I don't shoot the 2 remaining 308s that much now that I converted one of them to a 6.5CM and got two more 6.5CM's. Using 140 Berger Target projectiles and they fly nicely. I'm almost out and have to do some testing on the 142SMK's I picked up.

regards,

M
 

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What's the difference between IMR 4895 and Hodgdon 4895?
 

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H4895 is made in Australia by ADI as AR2206H.
I4895 is made by General Dynamics (Canada, IIRC).
Both are suitable for use as reduced loads.

As of this writing, Hodgdon disavows using IMR 4895 for reduced loads.
However, Ron Reiber at Hodgdon stated in a 2017 article written by John Barsness, that I4895 also works with the 60% rule.
He said H4895 is slightly more consistent, but both work well.
 
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