260 Rem. QL OBT/Node Help

[Dwh7271]

Cartridge          : .260 Rem
Bullet             : .264, 139, Lapua Scenar GB458 6018 G7
Useable Case Capaci: 45.756 grain H2O = 2.971 cm³
Cartridge O.A.L. L6: 2.800 inch = 71.12 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : Alliant Reloder-17 ?, Temperature: 40 °F

Predicted data by increasing and decreasing the given charge,
incremented in steps of 2.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step    Fill. Charge   Vel.  Energy   Pmax   Pmuz  Prop.Burnt B_Time
 %       %    Grains   fps   ft.lbs    psi    psi      %        ms

-20.0   77    34.00   2278    1602   29628   8219     95.7    1.622
-18.0   79    34.85   2334    1681   31581   8444     96.7    1.579
-16.0   81    35.70   2390    1762   33665   8654     97.5    1.537
-14.0   83    36.55   2445    1845   35887   8849     98.2    1.496
-12.0   85    37.40   2500    1929   38260   9028     98.8    1.454
-10.0   86    38.25   2555    2014   40794   9189     99.3    1.411
-08.0   88    39.10   2609    2101   43502   9331     99.7    1.369
-06.0   90    39.95   2663    2189   46398   9454     99.9    1.329
-04.0   92    40.80   2717    2278   49498   9557    100.0    1.291
-02.0   94    41.65   2770    2367   52818   9644    100.0    1.254  ! Near Maximum !
+00.0   96    42.50   2822    2458   56375   9728    100.0    1.218  ! Near Maximum !
+02.0   98    43.35   2874    2549   60196   9808    100.0    1.183  !DANGEROUS LOAD-DO NOT USE!
+04.0  100    44.20   2925    2641   64299   9886    100.0    1.150  !DANGEROUS LOAD-DO NOT USE!
+06.0  102    45.05   2976    2734   68711   9961    100.0    1.118  !DANGEROUS LOAD-DO NOT USE!
+08.0  104    45.90   3027    2828   73466  10032    100.0    1.087  !DANGEROUS LOAD-DO NOT USE!
+10.0  106    46.75   3077    2923   78589  10100    100.0    1.057  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba     96    42.50   2927    2644   68845   9331    100.0    1.129  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba     96    42.50   2660    2185   45588  10016     98.0    1.335

that moves the node around 42.3 to 42.4

 

[longrangehunter]

Thanks Dewey!

 

[Dwh7271]

Yessir, anytime

 

[longrangehunter]

Great thread Kevin. I'm watching and learning buddy.

Thanks Scotty! My LGS didn't have any H4350 BTW! Since I just had to spend $1,900.00 on fixing a manufacturing mistake on my M6040 Kubota, and buying 1,000 Lapua bullets I'm going to use the 4 pounds of RL-17 I have on hand. That will save me $100.00, and since I have the powder sitting around I may as well use it this year.

Very sorry to hear about your friend Scotty, I hope you're coping well enough with it buddy.

 

[Dwh7271]

Kevin;
You need RL17 QL?

 

[TackDriver284]

Kevin;
You need RL17 QL?

Whoo, RL 17 will push it fast.

 

[longrangehunter]

Kevin;
You need RL17 QL?

Whoo, RL 17 will push it fast.

I don't Dewey, but thanks for the help from both of you guys.

 

[longrangehunter]

I finally got around to sighting in my GAP 260 Rem. with the new load I developed with RL-17, and the lapua 139 Scenar. Seems to prove out very well considering this is shot prone off a bi-pod and a bean bag rear rest. This was shot today @ 101 yards, and I'll still have to re-shoot this after unlocking the turret set screws and re-setting a zero. Good enough for the Chicks I run with! lol

 

[Dwh7271]

Nice. Doesn't appear the bipod hurt any. :grin:
Also a shame those GAP rifles don't shoot. :lol: :lol: In truth though, I haven't seen one of theirs that doesn't shoot lights out.

Have you run any RDFs through it yet? I'm curious what you think of them. I have some loaded for the 260 AI but haven't shot them yet.

 

[longrangehunter]

Have you run any RDFs through it yet? I'm curious what you think of them. I have some loaded for the 260 AI but haven't shot them yet.

I have not even thought of it honestly. :roll: :lol: The Lapua Scenar is easy to tune for, and they're easy to find in bulk, plus I already know what to seat them at in my rifles. Maybe one day after I see enough of them used, and get the bug to try something new?

 

[Dwh7271]

Makes perfect sense. No need to change what's working, I was just curious.

 

[Dwh7271]

Makes perfect sense. No need to change what's working, I was just curious.

 

[SJB358]

Great shooting! That rifle shoots every darned thing well.

 

[longrangehunter]

Nice. Doesn't appear the bipod hurt any. :grin:
Also a shame those GAP rifles don't shoot. :lol: :lol: In truth though, I haven't seen one of theirs that doesn't shoot lights out.

Very True, and why I'd sell every rifle I own for one, or two super accurate rifles vs. a dozen so-so factory rifles in the safe. Something like a 6.5/06, and a 338/06 or a 35 Whelen; or a 300 WM or a 300 WSM, and a big 338 like the 338 Norma Magnum, or 35 STA would be interesting. Even a 6.5x47 Lapua, and a big .300 would work around the world IMO.

There are some very good rifle builders out there. I know more then a few of them I'd put my full faith and trust in and never look back. Some are too pricy IMO, but George Gardner at GA Precision builds a great product for a very good price IMO. Sure 4K is a lot, but so is having 4-6 factory rifles, and for the ammo and time you'll save searching for a good load you'll be hunting sooner than just the average gun off the shelf.

 

[longrangehunter]

Great shooting! That rifle shoots every darned thing well.

Thanks Scotty! :grin: It makes my job easier, and does make me look good ringing out great shots on steel during a match. I have two coming up back to back, I hope to do well this year.... ? If I could just avoid having an off day and make the most of the 2-3 days at these events.

 

[longrangehunter]

Just got out to test for zero and POI, looks like the previous target. I did somehow manage to put 3 into one hole, but seeing the hole was messing me, and my POA.... Dots are tough to stay centered and seeing the hole didn't help! FWIF I still only use a 3-12 scope, but is very clear and a nice wide FOV..... nothing worse then not being able to get on target 'cause your scope is set on too high of a magnification!

So this will be my first year using this rifle suppressed using the TBAC 30BA can I've had now for a few years. Although now I've added a Rifles Only MAD cover rather then using nothing at all. BTW this is no light weight gun anymore! lol

 

[Dwh7271]

That looks great!
Good luck at the matches.

 

[SJB358]

That is a wicked rifle. Can't help but like a rifle that is that nice and stacks bullets as well.

 

[longrangehunter]

Thanks Scotty!

I just opened another 1 lb. bottle of RL-17 and noticed there was a lot of gunpowder kernels stuck to the underside of the seal of the cap...... I don't like it when a canister gets exposed to air, those kernels turned a funky green to the inside of the sealed cap.

I inspected the bottle for color, and the sniff test, and compared it to the other bottle I had used. It looked and smelled normal, I'd hate to find out this has slightly gone off? Without testing it over my chronograph I might have to go open another bottle? I started with (4) 1 lb. bottles which makes roughly 164 rounds per pound. Just sucks since I have 600 pieces of bullets that were slated for this powder, and they were all the same lot, plus I've had them for quite a few years now.

 

[SJB358]

I bet it's fine Kevin. I looked and mine has a slight green'ish tint as well.