Help On Load

[BigDawgWill44]

Need help on what to do next.

Rifle: Winchester Model 70
.270 Winchester
H4831SC
Barnes 129 gr LRX
Primer: Fed 210M
.050” off the lands


Ran a ladder test at .050 off lands, found a flat spot around 60.2 grains (max load in manual is 60.5) Loaded 10 rounds at 60.2 to see if this was accurate. Indeed, SD:5 ES:15 over 10 shots. Ok, now time to play with seating depth for accuracy.

Followed Barnes recommendation to work in .025 increments starting at .050 off the lands. Started at .050 and went to .150 off. ES and SD opened up significantly, like 80 ES. Accuracy on paper not great either. What is going on?


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[Tx_6UM]

How was the accuracy on the first load?

 

[BigDawgWill44]

How was the accuracy on the first load?

Not great


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[MT-nuffgun]

Try a 10 shot group with the same powder charge and .100 off the lands. If that doesn’t shoot try a different powder or bullet. H4831sc is a very good powder for the .270 win. That being the case I would try a different bullet if .100 off the lands doesn’t shoot

 

[HuntHarder]

I'd try a different powder. I just experienced something similar when I was trying to gain speed. I had an accurate load developed in my 300 win using h4350. My new lot of powder seems like it is slower than my long established load. So I decided to try the same bullet with h4831sc. My Es was amazing ( 9fps over 6 rounds) but my gun's now shoots patterns, not groups.

I loaded up 4 different charge weights of 4831sc and they all shot like trash, but had good Es/SD and good speed. Back to my original load of H4350.

 

[ResearchinStuff]

I've had barnes shoot poorly if the barrel was dirty with non- barnes fouling. So, first step is to clean. Then try this:

Thread 'Painless load development (mine)'

Oct 25, 2021

I have had multiple people ask me to lay out how I do load development being that what I do is different. Since Shaen @Shooter71 just rebarreled a Tikka 595 in 6XC I thought it would be easy to show how I do it. It’s a Master Sporter with a T3 lite profiled 20” barrel- keep in mind it is a T3 LITE barrel. So by conventional “wisdom” it should be more picky and less accurate than a heavy barrel. His work is shoddy (), but I bet I can overcome it.

The rifle-


First was @Unknown Munitions factory load with 105gr Berger Hybrids. 5 rounds to zero, 5 for a...

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[sniper20]

I would suggest another bullet... I have found through years of messing stuff up...haha, that if you have a hunting rifle, don't pay attention to velocity or SD if you have an accurate load. Once you have the accuracy, see what your velocity is. I have never found a deer that complained the bullet wasn't going fast enough...

 

[HuntHarder]

I would suggest another bullet... I have found through years of messing stuff up...haha, that if you have a hunting rifle, don't pay attention to velocity or SD if you have an accurate load. Once you have the accuracy, see what your velocity is. I have never found a deer that complained the bullet wasn't going fast enough...

I can agree to that to point, but if it's considerably slower than you expected or wanted, that can limit your effective range significantly.