Thread: Kimber Montana Ascent 280AI Load Development

Hmm not sure. Didnt get better.

Very consistent speed.





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Originally Posted by Tikka7mm08

Hmm not sure. Didnt get better.

Very consistent speed.





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Whats your jump like? I found they liked around 120-150 thou jump.

I'm not sure - but the 150gn were 3.25, 3.20, 3.15 COAL so picking a good jump. Will try to 162 ELDMs and ELDXs with those jumps. Then will get bedded if no joy.

Have you considered barrel whip? I know it is a thing with kimbers. Quite often full length bedding or taking a couple of inches off will help

I would be trying heavier projectiles myself. My Montana WSM shoots way better with heavier projectiles than the 165's

Yes I think it might be something like that....looking at getting the barrel rethreaded for my A-Tec adapter. And then someone to bed the action and lug. I think the COAL results with the 150 ELDMs means I'll have a lash with the 162 ELDMs at different COALs first.

FIL next door has a dreaded bore scope so will pop that through too.

Originally Posted by Tikka7mm08

Trying depth test with 150gn LRABs.



..

That's what I settled on with mine @ 3130 with plain old 2209 after trying all sorts of powders. Kills very well- last one levelled at 565yds and cartwheeled down the slope.

Yes I like them but going to try heavier now.

I am very surprised there isn't a wider range in speed... there should have been 30-40fps or thereabouts going from 3.325 to 3.215.

Have loaded up some seating depth loads using OBT. Had to try the ELDMs anyway so why not OBT. One small thing...I am using new brass and like to put a wee mouth chamfer on before running through the sizer... had that wrong way round.

Borescope showed polished barrel, no copper or surprises. Slight pitting one side at the muzzle. Will get new thread cut so will sort that. Might look at going to 22" as the speed is there to play with from 24".

Thanks to @burtonator some 180gn ELDMs over 59gn RE26 to try with my 162gn OBT loads.

Originally Posted by Tikka7mm08

Thanks to @burtonator some 180gn ELDMs over 59gn RE26 to try with my 162gn OBT loads.


Attachment 165864

Will be interesting to see what speeds you get from them!!

No luck. Fired 2 180s and 2" apart so saving last 3 rounds. Rifle is off to barrel cut, target crown, A-Tec adapter and bedding job. @burtonator 2 shots went 2860fps (24" barrel).