Thread: Kimber Montana Ascent 280AI Load Development

Yeah bit confusing, they have Mac 1 and Mach 2 but I think Strelok does all the calcs if you plug in the nominal BC? I'll test out to 600y and see where I get to.

Mach 1. I'm hungry.

I'm not sure of exact BC but I've been using. 796 recently. Shot out to 350 and found it was reasonably close.


For those interested, I've also just done a load for a kimber 280ai using 58.8grns RL 26, 180eldm, Norma brass, federal 215 magnum primers, coal 3.340 to fit mag and it shoots well sub MOA.

Final sight in today for 100 yard zero. And then 600 yard drop table test in pic (ignore bullseye shot that was @Stag at 400y) just before rain hit.

Seems be shooting a little low. I had the bc at .777 and the speed at 2813.





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That’s a tight wee group.

Have you tried adjusting the BC so it correlates with the 6.8inch drop? Jury seem to be out on the BC of those pills.

Scratching my head to honest. Could be my shooting. Played with BC and speed but seems quite a gap. Scope dials spot on.

Originally Posted by Tikka7mm08

Scratching my head to honest. Could be my shooting. Played with BC and speed but seems quite a gap. Scope dials spot on.

I guess that’s the purpose o validation. Create your own validated drop chart……certainly looks like it shoots well, ideally a third shot would give you that confidence.

Yep...hoping weather breaks.

The bc is more realistically .72 at those speeds.

Good shooting. Re your other thread question kimber / Rem mags, I compared the Rem 700 follower and the Kimber. The Rem is longer by prob 6mm. The Rem is a double stack and the Kimber a single, so the two are not at all compatible for a swap. The kimber follower has an abrupt step in the follower at the shoulder area of the case which would be fine with a 280 but is more than likely too abrupt for an AI with it's 40 degree shoulder. Do rounds lift up too much at the front when being loaded, is this the problem ? cant do much about mag length

All good. I read the follower and spring can be a weak point on them.

Originally Posted by Tikka7mm08

Scratching my head to honest. Could be my shooting. Played with BC and speed but seems quite a gap. Scope dials spot on.

If the scope does 1 inch rather than 1 moa there's about 3 inches of missing vertical?

if using Strelok Pro you can select between MOA, MRAD, inches@100yards or SMOA or cm@100m depending on what your scope actually is and you can tutu with the size of adjustment from there if your adjustments are not spot on.

Sometimes also you are just chasing your tail for fun

Originally Posted by Fisherman

If the scope does 1 inch rather than 1 moa there's about 3 inches of missing vertical?

I should have measured with a ruler so not sure exactly. Scope 1/4 MOA.



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SMOA on Strelok lifts it a few inches. Doesn't have that setting for the table which is a bugger so left with MOA on that.