Thread: Kimber Montana Ascent 280AI Load Development

Won't need to if I know where the shots go. The first two are consistent...

Quite cold this morning. Velocity same as the hot weather shot in above. Got the action torqued at 45lbs rear and 50lbs front. Up 10 for rear and 5 for front but not discernible difference.

Could go up a half grain to 61.5 and see if tightens or blows out groups. May be try a shorter COAL.



Photo of the Forbes and Kimber (Forbes shot well).

what powder my montana 300WSM shot this group. Had one try at bettering it with IMR7977 powder and every target looked like shotgun
I could not say the upper and lower holes were not "me" as I was only using a 2-8 scope on 8 power


I also found Precision Hunter factory ammo shot really really well if it comes in 280AI I would try a packet

RE26.

Originally Posted by Tikka7mm08

RE26.

have you tried 2225?? or 2217 even

No...I have kgs of 26 to burn and it isn't far off.

I reckon a skim bed would be good...but will get it cerakoted first.

Get it gold plated


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Nah not a copycat.

I reckon keep playing with charge weight looks like you are close to something good there

It groups like my kimber
I shrunk my group sizes by making sure that the front sling stud doesnt touch the front bag under recoil, and that the back of the psitol grip doesnt touch the rear bag. Also had to focus on keeping shoulder placement and pressure consistant.
Mine would shoot 2 shot well and then the 3rd would open up the group, it was often the rifle sinking into the bags by the 3rd shot that caused it.

This may or may not be the case with yours, just something I found with mine.

That could be right with my lead bag set up. I'm using a top of scope hold and found that works well.

61.5gn - groups not improved. Slight ejector mark but easy extraction. Magnum vs non-magnum primer. Mag primer lower sd. Not much in it.

Will try 61gn and seating depth variation.

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61.5gn group.




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I think it might be time to try a different powder.....happy to relieve you of that useless Rl26

If you could guarantee tighter groups...! Going to shorten the front mount forward screw, look at sanding out the barrel channel.