Got a 16" CMMG upper today.

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rgswaim
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Got a 16" CMMG upper today.

Post by rgswaim » Tue Jan 24, 2012 9:49 pm

I've been wanting a heavier bullet AR for quite some time and recently settled on the 300 BLK. While at local range I found that they had this upper for sale. Got the upper and a Magpul folding rear sight. Ordered Lee dies from Midway. Will be at the range soon to check this out. I think I'm going to like it.

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TMH260
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Re: Got a 16" CMMG upper today.

Post by TMH260 » Tue Jan 24, 2012 10:05 pm

Congrats on the purchase. What is going to be your first load?

rgswaim
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Re: Got a 16" CMMG upper today.

Post by rgswaim » Wed Jan 25, 2012 11:42 am

TMH260 wrote:Congrats on the purchase. What is going to be your first load?
I haven't gotten that far yet. I have plenty of 296, H110 and Lil'Gun on hand to try. Any suggestions?

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Re: Got a 16" CMMG upper today.

Post by TMH260 » Wed Jan 25, 2012 3:11 pm

If you want to go pure economy: 147 fmj COAL 2.130" 16.5 gr H110; more expensive 110 V-max COAL 2.040" 19.5 gr H110 and more expensive still 125 Nosler B-tip COAL 2.060" 17.5 gr H110

rgswaim
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Re: Got a 16" CMMG upper today.

Post by rgswaim » Thu Jan 26, 2012 11:38 am

TMH260 wrote:If you want to go pure economy: 147 fmj COAL 2.130" 16.5 gr H110; more expensive 110 V-max COAL 2.040" 19.5 gr H110 and more expensive still 125 Nosler B-tip COAL 2.060" 17.5 gr H110
Soon as I get my reloading stuff I'll give these a try and chronograph them. What I'm looking for is the heaviest bullet that I can drive over 2,000 fps.

TMH260
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Re: Got a 16" CMMG upper today.

Post by TMH260 » Thu Jan 26, 2012 11:50 am

That load has an average velocity of 1944 fps. Measurements were taken at an elevation of about 500 feet at 38 degrees, overcast and light drizzle. This is not a max charge. Also, with A1680 2K should be very doable.

rgswaim
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Re: Got a 16" CMMG upper today.

Post by rgswaim » Fri Jan 27, 2012 10:43 am

TMH260 wrote:That load has an average velocity of 1944 fps. Measurements were taken at an elevation of about 500 feet at 38 degrees, overcast and light drizzle. This is not a max charge. Also, with A1680 2K should be very doable.
You listed 3 loads. Are all loads at 1944 fps or just one of them? I'm hoping it is the 147 grain bullet.

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Re: Got a 16" CMMG upper today.

Post by TMH260 » Fri Jan 27, 2012 11:53 am

Sorry about that. Here is some better data with an additional load using the 175 SMK. Note these loads are not maxes and are rather generic. I just worked some up for reliability and economy (147's) and to use as an accuracy baseline for my carbine before modifications.

Hornady 110 V-max
19.5 H110
COAL 2.040"
AVG: 2410 fps
ES: 11 fps
AD: 4.8 fps
SD: 4.86 fps

Nosler 125 Ballistic Tip
17.5 H110
COAL 2.060"
AVG: 2144 fps
ES: 8 fps
AD: 3 fps
SD: 2.65 fps

Surplus 147 fmj
16.5 H110
COAL 2.130"
AVG: 1934 fps (almost your 2K John :P )
ES: 20
AD: 5.8 fps
SD: 6.94 fps

Sierra 175 SMK (LR118 Surplus)
19.0 A1680 Compressed
COAL 2.215"
AVG: 1782 fps
ES: 21 fps
AD: 6 fps
SD: 7.24 fps
Last edited by TMH260 on Sat Jan 28, 2012 8:39 am, edited 1 time in total.

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C2_Drew
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Re: Got a 16" CMMG upper today.

Post by C2_Drew » Fri Jan 27, 2012 11:55 am

rgswaim wrote:
TMH260 wrote:That load has an average velocity of 1944 fps. Measurements were taken at an elevation of about 500 feet at 38 degrees, overcast and light drizzle. This is not a max charge. Also, with A1680 2K should be very doable.
You listed 3 loads. Are all loads at 1944 fps or just one of them? I'm hoping it is the 147 grain bullet.
From the load data I've seen, that's about right for the 16.5 gr H110 M80 147gr.

Edit: There you go! TMH, are those numbers for Remington or formed brass?
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Re: Got a 16" CMMG upper today.

Post by TMH260 » Fri Jan 27, 2012 1:31 pm

Mixed LC reformed, CCI standard primers, 16 inch 1 in 8 twist SS DSA upper ELEV about 500', 38 degrees overcast.

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