129 Grain Accubond LR Load Developement

[TKO]

Kind of a cross post but I got my new build to the range today and worked up a load with Nosler ACBLR.

Details of load development here:

http://www.65grendel.com/forum/showthread.php?15181-Lightweight-Hunter-Build&p=170267&viewfull=1#post170267

Ladder Testing:

2n8r3v6.jpg


Five Shot Group

11tstbp.jpg

[LRRPF52]

Looks like you dialed that bad boy in.

Distance and load for the second pic?

ETA: Looks like 30.8gr of CFE223.

[Mad Charlie]

Thanks for posting! I too have pretty much decided on the 129 ABLR for my purposes. So far I have been working up with CFE 223 to find the pressure limit in MY chambers. I have a short range in my side yard to test for such things as pressure signs, velocity, and function, but it is only 20 yds to the back stop. That kind of limits my accuracy testing. So far I am up to 31.2gr with no signs of over-pressure that I can detect with a loupe and micrometer. I am nowhere near my notes right now, but I seem to remember that 30.8 was giving me some pretty consistent numbers from both of my Grendel's also

[TKO]

Looks like you dialed that bad boy in.

Distance and load for the second pic?

ETA: Looks like 30.8gr of CFE223.

100 Yards

30.8 gr of CFE223 (vibrated to settle)
Brand new Lapua brass right out of the box . . . no prep
CCI 450 primers
Light crimp (Lee Factory Crimp Die)
Shot through a Thunderbeast Ultra 7 .30 cal suppressor

Thanks for posting! I too have pretty much decided on the 129 ABLR for my purposes. So far I have been working up with CFE 223 to find the pressure limit in MY chambers. I have a short range in my side yard to test for such things as pressure signs, velocity, and function, but it is only 20 yds to the back stop. That kind of limits my accuracy testing. So far I am up to 31.2gr with no signs of over-pressure that I can detect with a loupe and micrometer. I am nowhere near my notes right now, but I seem to remember that 30.8 was giving me some pretty consistent numbers from both of my Grendel's also

30.8 was very consistent in my gun.

SD was 5 fps
ES was 11 (would have been single digit if not for one round that wouldn't get with the program)
Just over 2300 at the muzzle
In my gun I just started to notice a little primer flattening at 31.0 grains.

[lrgrendel]

Very nice shooting!

Yes, CFE seems to be the “go to” powder for 130 gr bullets....

[ThunderStick]

CCI 400
Hornady brass
CFE223 31.2gr
Nosler AB129LR
COL 2.27 in.

Howa mini, no pressure signs, <moa

I hope to put it on hair soon!

- Keep in mind this is a bolt gun load, not AR15 - LRRPF52

[Cornbread]

The only potential issue I see with CFE is temp stability. If you look at the numbers it's pretty significant. Has anyone tested this?

[LRRPF52]

The only potential issue I see with CFE is temp stability. If you look at the numbers it's pretty significant. Has anyone tested this?

Yes, it has been tested by at least 2 forum members with a cooler and ice at the range on a hot day.

It has a pretty high correlation of temp shift to velocity, ~1/1 IIRC.

[lrgrendel]

Yes, it has been tested by at least 2 forum members with a cooler and ice at the range on a hot day.

It has a pretty high correlation of temp shift to velocity, ~1/1 IIRC.

So would you expect to see much variation in velocity or pressure in CFE with a temperature spread say from 95 deg F to 50 deg F?

And just to clarify. We are talking about the temperature of the powder at the moment of firing?

[biodsl]

So would you expect to see much variation in velocity or pressure in CFE with a temperature spread say from 95 deg F to 50 deg F?

Here is some data I've collected over several range sessions last year. Shot from a 22" BHW barrel. The load is a 123gr A-Max over 31.2 grains of CFE, CCI 450 primer and a COAL of 2.250. The temp was taken from an airport about three miles from the range so take it for what it's worth. I allowed the ammo for 90 to 120 minutes to get near ambient air temp. Not exhaustive but I was just looking to get an idea. Sadly, I never did get to the range on a 70 degree day.

Temp Av Velocity
40 2497
50 2544
53 2548
56 2540
60 2581
80 2677
90 2661
90 2674

[bakabone25]

Has anyone worked with XBR8203 behind the 129 in short barrel{12.5 GB} . This is what i would like to try, however im not as skilled at reloading as most of you guys are. Im def still in the learning stage. I have new Lapua brass, cci450, xbr, and the 129ablrs. Im hoping this is a winner for the shorty.

[lrgrendel]

Here is some data I've collected over several range sessions last year. Shot from a 22" BHW barrel. The load is a 123gr A-Max over 31.2 grains of CFE, CCI 450 primer and a COAL of 2.250. The temp was taken from an airport about three miles from the range so take it for what it's worth. I allowed the ammo for 90 to 120 minutes to get near ambient air temp. Not exhaustive but I was just looking to get an idea. Sadly, I never did get to the range on a 70 degree day

Temp Av Velocity
40 2497
50 2544
53 2548
56 2540
60 2581
80 2677
90 2661
90 2674

Very informative. Thanks

[TKO]

Yes, it has been tested by at least 2 forum members with a cooler and ice at the range on a hot day.

It has a pretty high correlation of temp shift to velocity, ~1/1 IIRC.

Mutherpussbucket

Well the idea for the one load does included the idea of all seasons . . . summer groundhogs to mid February coyote. Looks like I need to shelve this load and find another or only hunt on 59 degree days. LOL

Found this to be interesting reading on the subject: http://precisionrifleblog.com/2016/0...s-imr-enduron/

[fdbyrne78]

I'm not new to reloading but I've not worked much with temperature-sensitive powders. The most accurate load I've found so far is 31.6gr of CFE pushing a 123SST. That's obviously at the high end for a safe load since my throat is extremely short.

I could be hunting deer at 300 yards in 25F weather or pigs at 100 yards in 105F weather.

Does pressure decrease proportionally with velocity? Could I bump the charge by .2 for a cold weather load to regain some velocity without surpassing the pressure I would normally see with the lighter load in warmer weather?

I'd obviously have to take great care to keep the loads separate. I know I can figure this out with sufficient testing, but I'm short on time with deer season opening in a few weeks.

[lrgrendel]

Mutherpussbucket

Well the idea for the one load does included the idea of all seasons . . . summer groundhogs to mid February coyote. Looks like I need to shelve this load and find another or only hunt on 59 degree days. LOL

Found this to be interesting reading on the subject: http://precisionrifleblog.com/2016/0...s-imr-enduron/

That article is great reading!

Depending on where you live, if you shoot a powder that is temperature sensitive you almost have to have a “load” for every “range” of temperatures.

Also if you are really serious, I guess we should have a thermometer with us at the range when load developing.....