Sanders Upper 6.8 SPC II

paxfish · Mar 12, 2019

Gents, Does anybody have comments good or bad about this supplier or about these components?

https://sandersarmoryusa.com/product/16-6-8-spc-complete-upper-assembly-with-bcg/

Cornelius · Mar 12, 2019

paxfish said:
Gents, Does anybody have comments good or bad about this supplier or about these components?

https://sandersarmoryusa.com/product/16-6-8-spc-complete-upper-assembly-with-bcg/

I bought a 6.5 Grendel upper from them two years ago and it is a great shooter. It's of good quality, for the money. The barrel looks like it was supplied by a big company but are not stamped or branded. They are basic, but if you aren't sure about getting into that caliber or perhaps money is tight, you could do much worse than Sanders. And they give you several options for customizing the upper.

jimbobborg · Mar 13, 2019

I thought it looked pretty good until I saw the 1:10 twist rate. No thanks.

dist1646 · Mar 13, 2019

jimbobborg said:
I thought it looked pretty good until I saw the 1:10 twist rate. No thanks.

What is wrong with the 1-10 twist in a 6.8spc? WOA uses a 1-11 twist.

jimbobborg · Mar 13, 2019

1-10 is the twist rate for the 270 Winchester. It's too fast for best performance with the 6.8 SPC using the heavier bullets. Works okay with the 90 gr bullets but accuracy is not great with 110-115 gr bullets. Just from my experience and others on the 6.8 forum.

smokey · Mar 13, 2019

jimbobborg said:
1-10 is the twist rate for the 270 Winchester. It's too fast for best performance with the 6.8 SPC using the heavier bullets. Works okay with the 90 gr bullets but accuracy is not great with 110-115 gr bullets. Just from my experience and others on the 6.8 forum.

Why would a faster twist hurt accuracy on longer projectiles and not shorter ones? As background, I'm asking with legitimate curiosity and not as an argument. From what I know, longer bullets need more stabilization because the center of gravity is further back from the pressure on the front, making them easier to yaw and tumble. If a twist is too fast and overstabilizes things, I should be a problem with the lighter/faster bullets that physically spin faster(with the increased velocity) and have less of a need for stabilization. So, why would a fast twist harm accuracy on longer bullet choices but not shorter ones?

jimbobborg · Mar 14, 2019

smokey0118 said:
Why would a faster twist hurt accuracy on longer projectiles and not shorter ones? As background, I'm asking with legitimate curiosity and not as an argument. From what I know, longer bullets need more stabilization because the center of gravity is further back from the pressure on the front, making them easier to yaw and tumble. If a twist is too fast and overstabilizes things, I should be a problem with the lighter/faster bullets that physically spin faster(with the increased velocity) and have less of a need for stabilization. So, why would a fast twist harm accuracy on longer bullet choices but not shorter ones?

That's a good question that I don't know the answer to. I'm basing my feedback on experiences of myself and a lot of other people who have shot thousands of rounds of 6.8 through different configurations.

dist1646 · Mar 14, 2019

Interesting comments. I would tend to think that the issue lies with the bullets rather than the rate of twist. Jim, what are they saying about bullets heavier than 110-115gr.? Is anyone using heavier bullets, say, 130gr even as single load? I have been kicking around the idea of building a 6.8spc or possibly a 6mm/6.8.

jimbobborg · Mar 15, 2019

I tried a few and I wasn't impressed with 130s. They intrude too far into the case or they stick out too far and get stuck in the lands. Speed out of most barrels is under 2400 fps.
110 gr Accubonds have a much higher BC than advertised, so that's my go to bullet for this caliber. Someone makes a 120, which is a nice balance.

paxfish · Mar 26, 2019

Thanks for taking the time to comment Gentlemen! I've still got the 6.8SPCII on the radar, but am leaning Grendel II or Valkyrie for the next upper....

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