Thread: My 260AI Load Development Begins

You'd hope so, otherwise you might aswell just fireform from the start?

Originally Posted by Mathias

I get 2950 with the 143 & RL17. Mines 30deg imp.

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2900 in my standard 260 with the 143 eld-x and superformance

Yep...just adjusted a little further and looks bloody good. Photo after feeding chooks.

So this will give 260AI performance (better than FF) and if I do say 50 at a time I am pretty sure by the time am thru with and loading as once fired will require minor sight adjustment if any - will test...but clearly a lot better than FF brass (but that is what works for me and I know others are happy to FF using them as plinking or standard 260 hunting loads...neither right or wrong just what is right for a particular individual).

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Lapua brass is much harder as expected. O-rings on ram broke so have to look for some at Mitre10.

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I have an AMP so will anneal after firing each time.

Great service from Whidden...immediate reply and sending out a new plug easier on o-rings. Also recommended annealing prior to sizing for Lapua - that AMP just got better. Suggested an expander to help the seal. Is that just a seating expander die just to barely push the neck mouth out? Any recommendations for one?

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One hydraulic formed and one FF:



Both Lapua and I can't see the difference. New regime is anneal, form, anneal, FL size. Sounds a bit too it but the longest part is the forming. Lapua seems to respond very well as can be see above. Lost 1 case because FL'd too quick from the annealer and the case mouth deformed a little (useable but not passable for my OCD).

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m think it's a Wilson neck only

That's the one...is it 6.5?!

Washers were easy to replace but it definitely chews through them after 5-6 cases so looking forward to the new plug they have already posted.

The I am thinking of puts a little step in the case mouth, for straight walled cases but also to aid seating flat base projectiles.

This one is 7mm, maybe just flare the mouth a little?

Yep just needs to be barely done... you not using this one? Just be doing more this morning and stoked with results, equals FF now.

Originally Posted by Tikka7mm08

Great service from Whidden...immediate reply and sending out a new plug easier on o-rings. Also recommended annealing prior to sizing for Lapua - that AMP just got better. Suggested an expander to help the seal. Is that just a seating expander die just to barely push the neck mouth out? Any recommendations for one?

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I use Lyman M dies for belling the neck to let flat base projectiles start nice and easy,
Have 4 of them to cover my different cals.

Cheers will see where I can them.