Need help choosing factory ammo for Kimber 270 wsm

[monwilj]

I bought a KIMBER MONTANA a while back in 270 wsm. Wondering if any of you have this gun and if so what factory ammo do you have the tightest groups with? Just looking to save a little time and money trying to figure it out.

Also does a Limbsaver Barrel De-resonater work on this gun, please let me know if you use one on it and if its worth the $20?

 

[NATE40]

I bought a KIMBER MONTANA a while back in 270 wsm. Wondering if any of you have this gun and if so what factory ammo do you have the tightest groups with? Just looking to save a little time and money trying to figure it out.

Also does a Limbsaver Barrel De-resonater work on this gun, please let me know if you use one on it and if its worth the $20?

Are you interested in punching holes at short or long distance or a well performing hunting round on what sized game?
I hear it's a good rifle and sub moa is possible. When it comes to factory rounds, there are choices but most are based on either hunting or match grade bullets. Every rifle likes its own ammo even if you bought 2 off the shelf each one could do a little better or a little worse with the same factory ammo at the same distance. This is why people who reload so they can match a custom round to their rifle and their purpose. There are many choices in factory If it was me starting from scratch I would first try the Hornady Superformance the 140 grain SST adv.VEL 3090-0.465 BC with a bullet drop on a 100 yard zero @sea level - 500 yds drop is 40 inches(-.04 for every 1000 feet above sea level) If you're in a lead free area then I would try Black Hills gold 130 grain Barnes Tsx adv Vel 2950 BC 0.431 drop@ 500 yds @ sea level is 47 inches (-.05 per 1000 ft above sea level)
Congrats on your new rifle enjoy it by shooting it a lot!! The more you shoot the tighter the groups will be. Let us know what you want to do with the rifle and you will get a lot of help.
PS As for Barrel De-resonator. I never had much use for one and I can't imagine any big difference with factory ammo. I do like Audette's Ladder Test on working reloads for a rifle.

 

[monwilj]

it will mainly be used for sheep, mule deer, antelope with the possibility of an elk on occasion. Looking to shoot 300-500 yards. So was thinking of using 130-140 for the deer sized game and 150 for elk. Just trying to get an idea on where to start. Was thinking the winchester accubond ct or xp3 but was leaning toward the accubond just because it makes a little bigger wound. does hornady make a factory road for the 270wsm? is see 270win but not wsm.

 

[300man]

i bought a kimber montana a while back in 270 wsm. Wondering if any of you have this gun and if so what factory ammo do you have the tightest groups with? Just looking to save a little time and money trying to figure it out.

Also does a limbsaver barrel de-resonater work on this gun, please let me know if you use one on it and if its worth the $20?

i've used the 270wsm for a while now and have had great luck with barnes 140gr tripple shocks.

 

[NATE40]

it will mainly be used for sheep, mule deer, antelope with the possibility of an elk on occasion. Looking to shoot 300-500 yards. So was thinking of using 130-140 for the deer sized game and 150 for elk. Just trying to get an idea on where to start. Was thinking the winchester accubond ct or xp3 but was leaning toward the accubond just because it makes a little bigger wound. does hornady make a factory road for the 270wsm? is see 270win but not wsm.

Sorry bud I'm getting older and so are my eyes I red Win somehow --on the 270Wsm here is a factory ammo chart (most common) for your rifle, The dark yellow highlight under the BC on the chart shows if its too low for extended ranges. the bright yellow highlight shows a BC too high for the load/bullet combo for extended ranges.
hope this is useful.
according to the chart shows the Win supreme accubond ct 140 gr shows 3200 vel bc 0.472 bright yellow(to high extended ranges) a drop 37" at 500 yds-- zero@ sea level shows 137 (37"@100 yd zero) and 237 (37 "@200yd zero) and a -.04 inch per 1000k in elevation

 

[monwilj]

so can you explain the chart a little better? Load to high for extended ranges - what exactly does that mean (how far is extended ranges)? Based off of the chart - what would be a good starting point would you say?

 

[NATE40]

The chart was put out by Burris and according to their test data. The Ballistic Coefficient (BC) is determined by the velocity and the sectional density (SD) of the factory ammo they tested. BC is what determines trajectory and wind drift, other factors (velocity among them) being equal. BC changes with the shape of the bullet and the speed at which the bullet is traveling, while sectional density does not. Spitzer, which means pointed, is a more efficient shape than a round nose or a flat point. At the other end of the bullet, a boat tail (or tapered heel) reduces drag compared to a flat base. Both increase the BC of a bullet. The chart showed a high BC more streamlined "but" as the bullet slows down the SD (stays the same weight) can change the flight of the bullet and the BC . So the chart claims that this round may not perform as well when bullet really starts to slow down about 350 Yards and beyond. So using the chart as a guideline on choosing a factory hunting round you would avoid the highlighted rounds at first.
try to find a round that is faster with a Higher BC matched to the load (not highlighted) use the chart for inputs a ballistic calculator (on this sites toolbar)find out your drop different ranges inches or moa or mils you can also factor in wind. Then purchase ammo and start shooting to see where they print once zeroed you will know where the path of your bullet at short and long distances and windage. The chart is useful for knowing what factory rounds are being produced and the ballistics @sea level and the change of the flight of the bullet to the elevation of the area your hunting
Hope this helps