AR-10T 20" StnlsStl FF 1:10 175gr SMKw/H4895 .308

[KRAKER]

I've been thinking of working up a new load for my AR-10T using 175grSMKs over H4895, I've been using 165grSST Hornady over 44.0gr Varget, only because I had a bunch loaded up for bolt gun (hunting). Has anyone else been down this road before? (175grSMK w/H4895) If so where did you start, where did you finish, and what where your results with this rifle, bullet, powder combo? Thank you in advance for your replies.

 

[sawgunner2001]

Re: AR-10T 20" StnlsStl FF 1:10 175gr SMKw/H4895 .308

Here's my experience with a 20" GAP built DPMS LR. All loads are WIN brass and CCI BR2 primers with a COAL of ~2.801" (I don't have a comparator). Extractor marks showed up on nearly ALL loads. Also, there were no signs of pressure on the primers in ANY the following loads. My only "true" indicator of pressure was loose primer pockets. Additionally, the primer pocket comments are based on a VERY small sample size potentially limiting the usefulness of that data. I haven't made any comments about accuracy in the "notes" section because all my testing has been done at 100yds thus far. Additional testing is underway in the coming weeks.

Charge Powder Bullet Velocity Notes

41.5 H4895 178 Amax 2531
42.0 H4895 178 Amax 2562
42.5 H4895 178 Amax 2600 Loose pockets
43.0 H4895 178 Amax 2635 Loose pockets
43.5 H4895 178 Amax 2658 Loose pockets
44.0 H4895 178 Amax 2675 Loose pockets
44.5 H4895 178 Amax 2703 Loose pockets


43.0 Varget 178 Amax 2516
43.5 Varget 178 Amax 2546 Primer pockets acceptable
44.0 Varget 178 Amax 2585 Loose pockets
44.5 Varget 178 Amax 2600 Loose pockets
45.0 Varget 178 Amax 2654 Loose pockets

Sorry if the chart is hard to read. It was copy/paste from MS Excel.

 

[mrhog]

Re: AR-10T 20" StnlsStl FF 1:10 175gr SMKw/H4895 .308

My best group out of my AR-10 has been 44gr. IMR 4895 with the 175 SMK. The OAL is 2.83 with FGMM brass with CCI br2 primers. No MV as of yet (brand new crono bit the dust first trip out); I have shot 45gr with no pressure signs.
Before this load I used 44.6 gr of Varget under the 175's

 

[2ndPanzer]

Re: AR-10T 20" StnlsStl FF 1:10 175gr SMKw/H4895 .308

42.5 H4895 in military cases has been a proven performer for me in an AR10.