6.5 156 EOL

[Desert Demon]

Thanks. If I can get ahold of some, I will.

 

[RckyMtnRutt]

Anyone have any advice for the 156's in a 6.5 creedmoor? Been doing some load development and thought i would be getting bug holes. I have a tikka ctr so i am limited to mag length. So my COAL was 2.944. The charge development looked promising at 100 yards. Almost all the shots were touching. Then I loaded up higher charges and took it out to 200yards for 3 shot groups. Groups were about 1moa to a little less then that 0.800. Wondering if I should give it more jump since I cant chase the lands?

Tikka 6.5cm ctr 20" barrel
lapua LRP
fed 210m
H4350

I got up to 41.4gr of h4350 and still haven't seen any signs to back off. It is a newly opened jar of powder though. The avg was 2577fps. Sounds like some people are jumping like 0.100-0.120 and getting good results? Measured my lands at 3.021.

 

[codyadams]

Anyone have any advice for the 156's in a 6.5 creedmoor? Been doing some load development and thought i would be getting bug holes. I have a tikka ctr so i am limited to mag length. So my COAL was 2.944. The charge development looked promising at 100 yards. Almost all the shots were touching. Then I loaded up higher charges and took it out to 200yards for 3 shot groups. Groups were about 1moa to a little less then that 0.800. Wondering if I should give it more jump since I cant chase the lands?

Tikka 6.5cm ctr
lapua LRP
fed 210m
H4350

I got up to 41.4gr of h4350 and still haven't seen any signs to back off. It is a newly opened jar of powder though. The avg was 2577fps. Sounds like some people are jumping like 0.100-0.120 and getting good results? Measured my lands at 3.021.

It's been a while since I loaded the 156's in a 6.5 cm, but out of a 24" I believe I was getting around 2600 and change with the final load. I read where Jeff Brozovich was loading them in a 26"? Christensen arms 6.5 cm, and was around 2750 with H4350. I would work up at least until you see pressure signs, there may be a better accuracy load up there, and if not then at least you will know where your max is.

 

[RckyMtnRutt]

It's been a while since I loaded the 156's in a 6.5 cm, but out of a 24" I believe I was getting around 2600 and change with the final load. I read where Jeff Brozovich was loading them in a 26"? Christensen arms 6.5 cm, and was around 2750 with H4350. I would work up at least until you see pressure signs, there may be a better accuracy load up there, and if not then at least you will know where your max is.

Yeah I have combed through a ton of threads and Broz is all over them with good info. I actually have the 20" barrel running suppressed. Guess I'll keep working up see if I can hit 2600 and find and accuracy node. My 147 elms run 2600 so I'm guessing that will be about where the 156's will end as well. This is my second year reloading and I have the 143's and 147's dialed. Just trying to tune these 156's.

 

[jsthntn247]

Peterson's small primer brass. Every creed has shot 45.4-45.8 grains of Re 26 well with the 156. My tikka Superlight shoots it stupidly well out to 1k, almost boring hitting plates.

 

[WildRose]

Anyone have any advice for the 156's in a 6.5 creedmoor? Been doing some load development and thought i would be getting bug holes. I have a tikka ctr so i am limited to mag length. So my COAL was 2.944. The charge development looked promising at 100 yards. Almost all the shots were touching. Then I loaded up higher charges and took it out to 200yards for 3 shot groups. Groups were about 1moa to a little less then that 0.800. Wondering if I should give it more jump since I cant chase the lands?

Tikka 6.5cm ctr 20" barrel
lapua LRP
fed 210m
H4350

I got up to 41.4gr of h4350 and still haven't seen any signs to back off. It is a newly opened jar of powder though. The avg was 2577fps. Sounds like some people are jumping like 0.100-0.120 and getting good results? Measured my lands at 3.021.

What is the twist rate of your barrel?

 

[RckyMtnRutt]

What is the twist rate of your barrel?

It is a 1:8. I understand berger says to load at factory 2.800 i just thought the closer i got to the lands i would be better off. My 2 shot "groups" at 100 for the powder charge working up were all under 1/4 groups. Should have shot 3 shot groups but i was trying to save components. My 143's/147's are set at 41.4gr h4350 and shot 1/4-1/3groups at 200. So i know the gun is accurate.

The cut outs are working the charge up the full target is 200yards 40.8-41.4gr. The middle being 41.4 which i thought would be the sweet spot but was the worst.

 

[WildRose]

It is a 1:8. I understand berger says to load at factory 2.800 i just thought the closer i got to the lands i would be better off. My 2 shot "groups" at 100 for the powder charge working up were all under 1/4 groups. Should have shot 3 shot groups but i was trying to save components. My 143's/147's are set at 41.4gr h4350 and shot 1/4-1/3groups at 200. So i know the gun is accurate.

Try running that through a stability calculator, you may only have marginal stability with that bullet and Tw rate.

Something else isn't making sense either. The closer you get to the lands the more pressure spikes are likely to happen. It doesn't make sense you are seeing more pressure signs further off the lands.

 

[RckyMtnRutt]

Try running that through a stability calculator, you may only have marginal stability with that bullet and Tw rate.

Something else isn't making sense either. The closer you get to the lands the more pressure spikes are likely to happen. It doesn't make sense you are seeing more pressure signs further off the lands.

Not really seeing pressure yet no bolt lift. Nothing wrong with primers. Seen like one or two marks from the ejector but not repeatable. The picture is from 40.8-41.4 left to right

 

[RckyMtnRutt]

Try running that through a stability calculator, you may only have marginal stability with that bullet and Tw rate.

Something else isn't making sense either. The closer you get to the lands the more pressure spikes are likely to happen. It doesn't make sense you are seeing more pressure signs further off the lands.

You were right my friend. Looks like my bullet is only marginally stable (1.46) at the velocity im at right now and the temperatures im shooting. Says im losing 1% of bc. But if i can get it to 2600 it will be stabilized and at higher temps and high elevation it will be stabilized as well. Which im usually never under 5000ft hunting and im testing in the desert at 3000ft at like 28 f right now. Thank you very much for the help

 

[WildRose]

You were right my friend. Looks like my bullet is only marginally stable (1.46) at the velocity im at right now and the temperatures im shooting. Says im losing 1% of bc. But if i can get it to 2600 it will be stabilized and at higher temps and high elevation it will be stabilized as well. Which im usually never under 5000ft hunting and im testing in the desert at 3000ft at like 28 f right now. Thank you very much for the help

If it were me I'd just shoot a different bullet. You can't count on what might be at higher evelavation.

My experience is that if a load is only marginally stable you're never going to get the accuracy and consistency out of it you want.

 

[Creedmoor shooter]

You were right my friend. Looks like my bullet is only marginally stable (1.46) at the velocity im at right now and the temperatures im shooting. Says im losing 1% of bc. But if i can get it to 2600 it will be stabilized and at higher temps and high elevation it will be stabilized as well. Which im usually never under 5000ft hunting and im testing in the desert at 3000ft at like 28 f right now. Thank you very much for the help

Sg of 1.46 isn't anything to worry about. I highly doubt that's your issue. I've shot bullets that a calculator would say is unstable but they shot fine. As others have said I'd work up to pressure to see if there's a node that your missing up higher. Also, I'd try jumping your bullets and see if that does anything. I've had good luck with my creeds jumping around .080-.090

 

[highdrum]

@RckyMtnRutt i ran 156s in a 24" tikka t3x. The ctr mag length hurts you a bit. I was utilizing long action magazine with a long actionbolt atop, loaded coal was just a lil over 3" touching lands. Tikka 6.5cm have an extreme amount of freebore, close to 0.250 or so(at least the 3 ive loaded for) I ran lapua srp brass, cci 450, rl26 seated 80k off for best accuracy @ 47.1gr 2750fps, found bolt lift/ejector marks up around 47.8gr 2820fps.

 

[new2mud]

Sounds like some people are jumping like 0.100-0.120 and getting good results? Measured my lands at 3.021.

Don't be afraid to experiment with jumping them. I (and others) have jumped the 156 EOLs to 0.120" with good results.