112gr Barnes LRX Prototype

[sneaky one]

D.D. I had to scrub my PC to the core last month. I'm sure you sent me that. I remember saying that the 3 grooved TTSX shot well- in 110 wts., Plus the TsX 110 grn.

[cory]

Need that old Devil Dog to give us an update or drop and give us 20!

Sorry, I've been tied up with a home remodeling project. I'm hoping to get out with them before Christmas.

[sneaky one]

Cory, sorry man- 2 reasons.... your remodeling project for starters....oh .. man......then .., I FINALLY , found some data to get you on the target with cfe. For a ladder- try a start point of 30.7 cfe-- end @ 31.7cfe. BAIL AFTER FIRST SHOT ON THESE----- IF it Looks bad on primer . It will be fine.

Don't load at 2.26 on these. If you do, that first shot will send a story to us involved in the project. Try longer COAL.

RS & I both shot a 105 Gmx @ 32.2 cfe- all was fine. Semi wimpy actually. Barnes is softer copper than Hornady's.
I like a 30-45k jump with these pills. Send me some chamber specs . Text me, as my Email is junky.


Or PM me, oopsie. Lemme know your Sammie chamber specs.

As I mentioned before- the TTsx-& Tsx have a better frontal area. Godspeed dude!

[cory]

Finally got a chance to shoot some of these. The mirage conditions forced me to run the ladder at 200 yards.

16" Bartlein Nitrided Barrel Chambered by PF 8" twist
Hornady Brass
CCI 450
Originally
OAL 1.656" COL 2.280" JTL 0.085"
8208 xbr gr/fps
28 2440.0
28.3 2440.0
28.6 2480.0
28.9 2486.0
29.2 2503.0
29.5 2539.0
29.8 2549.0



Thought please.

[Von Gruff]

With shot #3 being the high shot and #2 being the low shot, the center of the spread both vertically and horizontally (and consequently where the barrel is most stable) is shot #7
It may well be that shot#6 is the product of mirage or just one of those shots that fall outside of expectations but if it were my I would concentrate on 29.2 to 29.8 and might even try up a little more to see if you are just going into the node or there may be some left above where you have stopped.

[cory]

With shot #3 being the high shot and #2 being the low shot, the center of the spread both vertically and horizontally (and consequently where the barrel is most stable) is shot #7
It may well be that shot#6 is the product of mirage or just one of those shots that fall outside of expectations but if it were my I would concentrate on 29.2 to 29.8 and might even try up a little more to see if you are just going into the node or there may be some left above where you have stopped.

I was hoping you would give some input man!

The velocities were a bit catawompass, so I'm a tad bit concerned. I'm wondering if I shouldn't have went with my gut and used CFE, but it's to late to turn back. Or is it...

I really like your suggestions, if I stay with 8208 xbr I'm thinking another ladder (29.2gr, 29.5gr, 29.8gr, 30.1gr, 30.4gr) might be in order. However the new loads would be higher than the "standard" 30.0gr 8208 load for the 100gr TTSX. That's kind of a red flag for me. I do agree that it looks like it may of been heading into a node.

If we look at the OAL of the different bullets and consider that these have a long boat tail, the bearing surface of these are very similar to our common 123gr bullets (SST, HPBT). This leads me to believe that CFE would be the optimal powder choice and would be worth changing directions.

OAL (in)/ Length/ Weight (gr)/ Bullet
0.6310 1.230 123 Hornady SST
0.6585 1.200 123 Nosler HPBT
0.5740 1.156 100 Barnes TTSX
0.6740 1.297 112 Barnes LRX
0.7775 1.399 127 Barnes LRX
0.7095 1.350 129 Nosler Accubond LR
0.6585 1.294 130 Berger Hybrid Tactical
0.6178 1.239 90 Cerberus

[Von Gruff]

I agree if you have or can get a few more bullet to "prove that CFE theory. I used CFE for the 100gn TTSX (2950fps) as well as the 123gn A Max (2700fps) for very good accuracy and no pressure problems with the lighter bullet. The bearing surface of the 112gn LRX @.6740 is between the 100gn TTSX @.570 and the 123gn A Max/SST @.6310 so I would expect that the CFE would perform very well with the 112gn LRX.
The OAL of the 112gn LRX is .067 longer than the SST so if anything it would have a very slightly higher load density but in the case of my GM cartridge I am only at 96.2% load density so the extra .067 length plus a little more powder to bring up the velocity may just bring it to 100%.
I haven't used the 8208 but I have had such good results with CFE that I would start with it on almost every bullet within those parameters.

[cory]

A long overdue update. It should be noted that I don't have a lot of confidence in the velocities given to me by my ProChrono. I'd like to derive an MV by measuring actual drops at multiple distances. Unfortunately I'm out of prototype bullets. That being said my results thus far have been very promising!

16" Bartlein Nitrided Barrel Chambered by PF 8" twist
Hornady Brass
CCI 450

12/29/2016
OAL 1.656" COL 2.280" JTL 0.085"
CFE gr/fps
30.3 / 2588
30.6 / 2641
30.9 / 2667
31.2 / 2719
31.5 / 2716
31.8 / 2805
32.1 / 2801
32.4 / 2824
32.7 / 2828

07/06/18
OAL 1.646" COL 2.270" JTL 0.095"
CFE gr/fps
30.6 / 2381
30.9 / 2401
31.2 / 2414
31.5 / 2434
31.8 / 2467

There's a very promising node at 31.2grs to 31.8grs.

IMG_2774.JPG

If we assume an optimistic, but not unrealistic MV of 2700 fps and that the BC (0.414 G1) is half way between the Barnes 127gr LRX (0.468) and the 100gr TTSX (0.359) we get a very impressive trajectory!

[JASmith]

Welcome back!

[cory]

Haha thanks man!

I saw you tried to pm me. My box is full. Use the email option and shoot me a message. I'd empty my PM's but having to navigate this site on my phone is a PIA.

On a side note when is this site going to become a secured site, I.e. https?

[biodsl]

Welcome back!

Nice to see you're still around, Cory!

[JASmith]

....On a side note when is this site going to become a secured site, I.e. https?

We need to harass Hanka and the moderators to make that happen.

[LRRPF52]

A long overdue update. It should be noted that I don't have a lot of confidence in the velocities given to me by my ProChrono. I'd like to derive an MV by measuring actual drops at multiple distances. Unfortunately I'm out of prototype bullets. That being said my results thus far have been very promising!

16" Bartlein Nitrided Barrel Chambered by PF 8" twist
Hornady Brass
CCI 450

12/29/2016
OAL 1.656" COL 2.280" JTL 0.085"
CFE gr/fps
30.3 / 2588
30.6 / 2641
30.9 / 2667
31.2 / 2719
31.5 / 2716
31.8 / 2805
32.1 / 2801
32.4 / 2824
32.7 / 2828

07/06/18
OAL 1.646" COL 2.270" JTL 0.095"
CFE gr/fps
30.6 / 2381
30.9 / 2401
31.2 / 2414
31.5 / 2434
31.8 / 2467

There's a very promising node at 31.2grs to 31.8grs.

[ATTACH=CONFIG]12427[/ATTACH]

If we assume an optimistic, but not unrealistic MV of 2700 fps and that the BC (0.414 G1) is half way between the Barnes 127gr LRX (0.468) and the 100gr TTSX (0.359) we get a very impressive trajectory!

Did I miss something about why the ladders have such drastically different speeds, other than COL? Looks like 300fps difference with the same charge weights, but with 2.270" COL for the slower sample ladder.

Great to see you back.

[cory]

One of the reasons I said I don't trust this Chrono other than tracking changes in velocity for pressure spikes.

The more recent outing I think I was off center on the Chrono. I put more faith in the older speeds. I'll admit I'm biased towards it but it is in line with what I expected compared to other bullets from this barrel and the velocity I got with xbr and this bullet.

Work has slowed down for what looks like at least this quarter. Hopefully I can get more shooting in and I'll be around more often.

[sneaky one]

My chrono was acting up- couldn't trust the speeds. Trashed it. Get a magnetospeed, can use it anywhere. $200.00