It boils down to getting out and testing things in your own setup! You'll have to do some testing yourself to see what works best for you.
Both are good powders! So is 8208 as Mike suggested below!
Bart
6mm Grinch
- Thread starter tclaunch
- Start date
It boils down to getting out and testing things in your own setup! You'll have to do some testing yourself to see what works best for you.
Both are good powders! So is 8208 as Mike suggested below!
Bart
I would think 8208 to be just about perfect for the 80's, in this cartridge. We'll see pretty soon.
8208 is excellent!
Will give the various powders a try and see what works best for my setup (when it gets completed). A friend has some v135 he never used - so I have some now. I also have H4895 and XBR8208 to try. Thank you again for all the suggestions.
Sharing some findings -
For 1:8 twist
105g Berger VLD 25” 8.5 twist Krieger seated @ .005 before touch Fed205M primers
Powder 8208
29.2g avg. 2875fps E.S 14
29.5g avg. 2915fps E.S 9
29.8g avg. 2950fps E.S 15
Powder Benchmark
29.0g avg. 2857fps E.S 46
29.3g avg. 2895fps E.S 22
29.7g avg. 2920fps E.S 17
The E.S looks better with 8208 here but I had 3 identical pattern groups of 3 shots each @ 100 with 2 in 1 hole, 1 shot high. Guessing it may be my bag technique but the 8208 groups were very ordinary in comparison and maybe need much different seating depth.
For 1:8 twist
105g Berger VLD 25” 8.5 twist Krieger seated @ .005 before touch Fed205M primers
Powder 8208
29.2g avg. 2875fps E.S 14
29.5g avg. 2915fps E.S 9
29.8g avg. 2950fps E.S 15
Powder Benchmark
29.0g avg. 2857fps E.S 46
29.3g avg. 2895fps E.S 22
29.7g avg. 2920fps E.S 17
The E.S looks better with 8208 here but I had 3 identical pattern groups of 3 shots each @ 100 with 2 in 1 hole, 1 shot high. Guessing it may be my bag technique but the 8208 groups were very ordinary in comparison and maybe need much different seating depth.
Impressive speeds! My go to load with a straight 6 Grendel with 80's was 3,300 fps with Benchmark. I could get about 100fps more but it shot great there and brass life is very good.
This grinch is looking like a good option for 105gr bullets in a small case. Should make a very nice 1000m prone steel banger
Sharing some more chronograph findings -
For 1:12 twist
(naked) 80g Copperhead "00" Boat Tail, 23” H/V 12 twist Krieger seated @ .010 in from touch Fed205M primers
Powder 8208
31.0g avg. 3245fps E.S 37
31.3g avg. 3272fps E.S 14
31.5g avg. 3290fps E.S 23
Powder Benchmark
30.8g avg. 3217fps E.S 4
31.1g avg. 3250fps E.S 21
31.4g avg. 3273fps E.S 19
Conditions were a bit extreme at 102 degrees and 20% humidity. Elevation 1900ft
For 1:12 twist
(naked) 80g Copperhead "00" Boat Tail, 23” H/V 12 twist Krieger seated @ .010 in from touch Fed205M primers
Powder 8208
31.0g avg. 3245fps E.S 37
31.3g avg. 3272fps E.S 14
31.5g avg. 3290fps E.S 23
Powder Benchmark
30.8g avg. 3217fps E.S 4
31.1g avg. 3250fps E.S 21
31.4g avg. 3273fps E.S 19
Conditions were a bit extreme at 102 degrees and 20% humidity. Elevation 1900ft
Last edited:
they are naked
I have been working the Grinch with 105's and 80's the last few months and getting some numbers and tuning a bit here and a bit there. These targets were shot Easter weekend at 100 and 200 yds with my 12 twist barrel. The outlier on the 200 target was shot 5 and I guess often happens, but the 4 shots prior to that measure in at about .170". Still there's a bit of info on the targets and I was using CCI450 primers for this run. As soon a I can nail that 5th shot and make the other 8 targets similar I can put my feet up. I haven't put the tuner on yet, but that is next!
Attachments
Tim Singleton
Gold $$ Contributor
The key to ppc level accuracy is seating depth
A reamer throated long enough for the 80s to be up in the neck
Most likely will be to long for the 68 to touch
A reamer throated long enough for the 80s to be up in the neck
Most likely will be to long for the 68 to touch
I have .070 fb in a couple of straight
6 Grendels. It works with 68-80s.
6 Grendels. It works with 68-80s.
WyleWD
Silver $$ Contributor
Its accuracy capability compared to the PPC is closer than some give it credit for. I have a couple 6 Grendel barrels with 50fb and often shoot my best PPC vs the 6 Grendel using 68 and 80gr bullets. On any given day the Grendels are VERY close or better in a 5 group - 5 shot agg compared the PPC at 100yds, and the difference using 80's through a 12 twist Grendel at 200yds vs the PPC can be a real eye opener. YMMV.
I was in a quite competitive club level match earlier this year where 3 of the top 4 finishers (Out of 23(?) shooters) were shooting 6 Grendels using various makers of 80gr bullets.
Bottom line, I'd say the 6 Grendels are pretty darn close. And in the right hands maybe better. I'd imagine the 6 Grinch would have similar performance. Just my experience with them. WD
Gee - - 6mm Grinch kind of seems like just another copy of our 6mmAR Turbo 40
6mmAR Turbo 40 vs 6mmAR
yea but the 6mmAR.com doesnt return calls or e-mails so people who want the cartrigde like myself will go elsewhere no point it tryint to deal with that guy.
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