Thread: My 260AI Load Development Begins

No. Defiance/Proof Research.

Success a FF case.


Hornady 140gn


Suppressor - super pleasant to shoot either way.


Amax left, LRABs right. Looking for them to tighten up with more powder and/or seating depth adjusted with FF cases.

Should I just NS or FL size the FF cases?

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When I've done my fire forming, I only neck size and you could probably do that for another 3-4 loadings on that case. The case will tell you when a full size is needed as you will feel it on the closing of the bolt handle.
Keep us posted on the progress...

Originally Posted by Tikka7mm08

Should I just NS or FL size the FF cases?

This should keep the replies coming...

Myself, on my two AIs, as above I also tend to just neck size until the shoulders need to be bumped. I have on occasion gone down the FL path when I didn't need to, to try and gauge the effect on accuracy, and in these cases I wasn't able to detect a difference. I'm sure there was though...with reloading everything changes everything to some extent doesn't it, and it comes down to degrees vs the end application as to whether the difference is important, and in my case not.

Absolutely. I should say it is a howling NorWester here so that and the excitement of finally shooting a rifle started in March no doubt affected some of the groups. The VLDs were all over the place.

Do what works best. Remembering an improved shouldered case will not show pressure signs like a bottle neck.

I only neck size until they get a tadd stiff to chamber an empty. Usually 4-5 goes before I bump the shoulder as others have said.

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Yep thanks...will give it a go and update...must say the improved is a fine looking case!

Your LRAB results are like what I had in my 7RUM. Don't expect them to tighten up, they shoot well in some rifles and not in others.

Originally Posted by stug

Your LRAB results are like what I had in my 7RUM. Don't expect them to tighten up, they shoot well in some rifles and not in others.

Agree with you Stug, gave the 142LRAB's a go too but didn't match the VLDs in terms of accuracy.

Amax might be the go...1:8 twist so inc velocity might help....not theowing towel in yet!

What powder are you trying?

Have RE17

Try mag primers with different powders behind the LRAB.
You might get them to shoot.

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Alreadt using them. Always have.

Very nice rig.

Good to know the FF loads shoot well. Is the speed on the FF loads still usable for deer etc?