Thread: My 260AI Load Development Begins

Hi...sorry bit behind. Haven't seen the 143gners yet...got 2 boxes on order still.

Yeah I bet that bloody scope saga has really eaten into your enthusiasm
I've got about 90 loaded up for fire forming and sighting but due to my local range out of action very little else has happened on my 260Imp. Got a Magneto Speed on the way too, will get serious when this arrives.

Why all the hassle with fireforming??????

When I ackley improved my .257 Roberts I just fired standard .257 ammo and bobs your uncle! Fireformed brass.

Yeah mate spot on re the scope...!! Put a vx6 3-18 on it now. Got a few kilos of RE17 so that part sorted.

Re fireforming...I am probably going to get some cheap projectiles and fireform that way...

Originally Posted by Kudu

Why all the hassle with fireforming??????

When I ackley improved my .257 Roberts I just fired standard .257 ammo and bobs your uncle! Fireformed brass.

That's basically what I'm doing. I didn't buy factory ammo, I loaded my own and gonna bomb these away for fun.

Originally Posted by Tikka7mm08

Yeah mate spot on re the scope...!! Put a vx6 3-18 on it now. Got a few kilos of RE17 so that part sorted.

Re fireforming...I am probably going to get some cheap projectiles and fireform that way...

Yeah I had a spare LB of 2209 left over so I've loaded this up behind some 129gr Hornady which are cost effective and also a good performer if I want to swat something over. Save the RE17 for the main loading development.

Good thinking....will do that too!

Originally Posted by Tikka7mm08

Good thinking....will do that too!

Yea that's what I use as well for fireform 2209 and 129 grn Hornady shoots very well with same PIO just have the projectile hard into the lands.

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Yeah i'll prob go shoot some goats when i fireform my .260Ackley

Originally Posted by 25/08IMP

Yea that's what I use as well for fireform 2209 and 129 grn Hornady shoots very well with same PIO just have the projectile hard into the lands.

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Yup same here with mine can't beat it for fireforming

45gn RE17 143gnEld-x



45.3gn RE17 143gnELD



45gn RE17 140gnVLD hunting

Can anyone measure the groups for me and run these thru quickload?

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You gotta be happy with either of those Did you run them over the Magnetospeed?

Yes 45.5gn is 3007fps...think speeds are earlier in this thread. Had a primer pop but on 4th reload. So hard to judge pressure with AI cases.

Load so they only require a neck size until the 4-5th go and you will be right. If ya have to bump the shoulder or body size after firing one formed load you are getting up there.
3000 with a 140 is up there in the .260 AI depending on barrel length.

Shoots nice and its good to see groups posted on target for once😆



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Thanks @R93 - so will necksize this latest brass and see if it the bolt closes nicely. If not sign there is too much pressure, ie headcase expansion?