M80 147 grn starting point?

[boogyman]

Got a chance to burn some powder today. 17 grns of H110 yelded 2029 fps with a SD of 12 out of my 16" CMMG barrel. 5 shot group at 50 yards was .329. I'm well pleased! Also found a new subload, 200 grn Spear pointed softpoint behind 9.0 grns of AA2400. 956fps with a SD of 6. Group size at 50 yards was .356 (5 shots). Oh forgot to add, this was out of a AR. John good to see you again.

[JohnInNH]

Got a chance to burn some powder today. 17 grns of H110 yelded 2029 fps with a SD of 12 out of my 16" CMMG barrel. 5 shot group at 50 yards was .329. I'm well pleased! Also found a new subload, 200 grn Spear pointed softpoint behind 9.0 grns of AA2400. 956fps with a SD of 6. Group size at 50 yards was .356 (5 shots). Oh forgot to add, this was out of a AR. John good to see you again.

What bullet got 2029 fps?

(We should try to always put all data in the post so people can cut n past loads they like. Bullet, powder and weight, barrel length, OAL maybe be nice too, gas or bolt)

Good to see you here as well.

Lots of my testing is late at night so i do not have fps or accuracy. Yet.. when conditions merrit i will edit to add chrono and accuracy.

Supers are hard to do at the house. Subs are easier... granted i had one 110 go super at 4 am CRACK! Lol oops!

Very nice load data good ES

Thanks

[boogyman]

Sorry John, 147grn M80. Ill get the OAL in a minute, got some brass in the ultrasonic cleaner.

[boogyman]

2.108 AOL is what I have. Seated up to the cantalure.

[Jargonhead]

Sorry John and everyone else, friends' birthday yesterday and I didn't get over the cocktail flu until the afternoon...and the weather was unpleasant, at least for Florida. I'm going on Friday and will post. I did post some info on the SOST projos in a recent thread.

Rob

[JohnInNH]

Sorry John, 147grn M80. Ill get the OAL in a minute, got some brass in the ultrasonic cleaner.

I tried 17.5 gr w296 with the M2 ball 150_152 gr bullets in my micro7 and got:

1983 average fps
ES= 46
SD= 17

With pressure signs (slight primer flow back into the firing pin hole) 5 gr makes this much difference?

Then went to 1680 powder 20 gr only gave me 1838 fps ES= 32 no pressure signs but going up caused it to have very strange primer behaviour maybe if i went up more past that and compressed it more?

So thats why i have tried XMP5744 ran out of sunlight but did only get one shot to register at 1880 fps with pressure, so that failed too.

[pvanwagner]

Just got my 147grn M80s in the mail yesterday from Hi-Tech. Haven't started on a load for them yet. I've been using A1680 behind 125gr Nosler Ballistic Tips and 168gr Sierra Match.

With the 125gr Nosler BT (OAL 2.165") I'm getting 1924fps at 19.5gr, 1987fps at 20gr, 2020fps at 20.5gr, 2035fps at 21gr, and 2067fps at 21.5gr. This load is a published load by Western Powder - The chrono data is my data.

With the 168gr Sierra Match (OAL 2.245") I'm getting 1718fps at 17.8gr, 1821fps at 18.8gr, 1875fps at 19.8gr, 1891fps at 19.9gr, 1907fps at 20gr, and 1924fps at 20.1gr. That 20.1gr load is very close to major power factor (323pf) and no signs of overpressure (using my AR). This load is a published load by Western Powder loaded a little longer than they list for this load. Published length is 2.200" - The chrono data is my data. Note - The published loads only go up to 19.7gr. I'm .4gr over their published data and can't recommend that of course.

This was all with a 16" AR.

I just finished on Saturday shooting up my 147gr bullets loaded by Summit and they were averaging 1988fps out of my AR.

I'm glad you all turned me onto the pulled M80 bullets. I needed a cheaper round to play with. Those Noslers and Sierras get expensive and the rounds loaded by Summit were 80 cents a bullet. I hope to get a good load going with the M80s soon using A1680.

I'll post it when I get some data.

[pvanwagner]

Then went to 1680 powder 20 gr only gave me 1838 fps ES= 32 no pressure signs but going up caused it to have very strange primer behaviour maybe if i went up more past that and compressed ...

John, what OAL are you using with the A1680 and the 147gr M80s?

[JohnInNH]

Then went to 1680 powder 20 gr only gave me 1838 fps ES= 32 no pressure signs but going up caused it to have very strange primer behaviour maybe if i went up more past that and compressed ...

John, what OAL are you using with the A1680 and the 147gr M80s?

I am not using m80 ball I am using M2 Ball 150-152 gr bullet and am seating to the crimp groove 2.215"

[NickelBrass]

John,
I too, want to work on the 147gr FMJ M80 bullets for the everyday plinking round. I have a lot of data that I
shot today and I will share it as soon as I make heads and tails of it. I was working on loads using W296 only
in today's testing. As a sort of control round, I shot some 147gr FMJ rounds from Southwest Ammunition
over my chronograph. 16" DCA barrel, light breeze, 61 degrees. They have the bullet loaded to an
OAL of 2.020". I don't know what powder is being used, but get this string:

2035, 2040, 2039, 2042, 2039 - SD: 2.1
Brass looks ok, primers are flat across, not cratered, a few shiney spots on the head surface ( bolt marks ).

I did shoot some of my own and here is the pertinent info.
2.170" OAL, W296 power, WSR primers, Brass 1.355", Once-Fired LC, Bullet 147gr FMj M80

17.2gr W296 1925, 1957, 1953, 1930, 1964 AVG: 1946 SD: 17.8
17.4gr W296 1985, 1964, 1984, 1974, 1977 AVG: 1977 SD: 7.5
17.6gr W296 1975, 1971, 1942, 2008, 2003 AVG: 1980 SD: 25.7

(1&2) Brass looks ok, primers are mostly flat across, not cratered, no bolt marks
(3) Brass looks ok, primers are flat across, not cratered, a couple small bolt marks


Side Note:
I also shot some of the Remington 125 OTM from this same 16" AR barrel.
2216, 2201, 2180, 2208, 2216 AVG: 2204 SD: 12.4

I shot several other 147gr loads with W296 and I am not real happy with some of them. It
seems that at some point the SD goes into the 50's and 60's. Using W296 in larger amounts
seems to hit some point of instability or consistency in its combustion cycle. I don't know.
I will post some more later.