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243 Win. 85 gr. or 100 gr.

 
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  #1  
Old 08-19-2009, 12:26 PM
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Location: Kingston, Tennessee
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243 Win. 85 gr. or 100 gr.

I need a little help here. I have a Model 70, 243 Win. w/4x-12x40 scope. I hunt whitetails and coyotes with it. Maximun distance on either one would be 400 yds and more than likely less than 300 yds. I am going to stick to the 85gr. or the 100 gr. at the present time just due to the availabililty at any gun store. What grain would be the most versatile and what would you sight it in for? And last, is there a possiblilty of using BOTH bullets and just switch them out for whatever game I am after?
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  #2  
Old 08-19-2009, 04:06 PM
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Re: 243 Win. 85 gr. or 100 gr.

Quote:
Originally Posted by Teamroper View Post
I am going to stick to the 85gr. or the 100 gr. at the present time just due to the availabililty at any gun store. What grain would be the most versatile?
I think the 100 grain would be most versatile. The reason is shooting at deer at 400. I don't have my ballistic software right here, but I'm inclined to think that 400 would be at the outside limit of the 100grain bullet in the 243 when shooting deer.

Shooting at yotes is a different story. With the 100grain pills, you could shoot well past 400 yards on yotes.

Quote:
what would you sight it in for?
You have couple of routes to go here:

1. Sight-in for 100 yards, then dial your scope for the range of your intended target.

2. Sight-in for point blank range. That is to say, a deer has an 8" kill zone. You would need to find the distance where your bullet neither rises nor falls more than 4". That way, if a deer steps inside that range, you know you can hold dead-on and hit him in the vitals. Beyond the point blank range you would have to hold over or dial for the distance. My guess is that your sight-in distance would be around 250 yards.

3. Knowing that your point blank range is probably in the 250 yard range, I would just sight-in for 200 then dial the distance of any longer shots. I would go this route because you will probably find that your point blank range is some odd number like 238 or 263 and most drop charts are in increments of 25 or 50 yards. With a 200 yard zero, it makes it easy to dial the distance based on your drop chart.

Quote:
possiblilty of using BOTH bullets and just switch them out for whatever game I am after?
This is all about knowing the trajectory of any given load in your rifle. You can easily have both cartridges sitting next to your rifle and drop in the one you want for the game you're going to shoot. Then refer to the appropriate drop chart for making the shot.

My recommendation would be to simply find the 100grain load that shoots well in your rifle and go with that. Then get to know that load inside and out. So regardless of whether it's a deer or a yote, you are confident in placing the shot.

Have fun.
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  #3  
Old 08-19-2009, 05:01 PM
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Re: 243 Win. 85 gr. or 100 gr.

I'm just shooting from the hip here, but I am not sure the Win Model 70 can stabilize the 100 gr. bullet. If memory serves me correct (and it fails me more often with each passing year), the model 70 barrel has a 1:10 twist. If this is in fact the case, stability may be tough to achieve and hold with a 100 gr. bullet. The Remington 7 and 700 models come with a 1:9.3 twist and I have been able to confirm on this site that there are others out there that can stabilize a 95 gr. bullet and some will even stabilize the 105 gr bullet, although the shooters readily admit it is pushing it to the limit.

Berger's website suggests a 1:9 twist rate for their 95. gr bullet; a 1:8 twist for the 105 gr.; and a 1:7 twist for their 115 gr VLD's. On the other hand, the Lilja barrel website suggests that a 1:10 twist is sufficient to stabilize a 100 gr. bullet. In the end, it may come down to the profile and design of the bullet itself, more than just the weight alone. I would buy a box of the 100 gr. and experiment. It may be that your best round (accuracy) will be in the 80-85 gr. class of bullet.
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Old 08-19-2009, 10:33 PM
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Re: 243 Win. 85 gr. or 100 gr.

Quote:
Originally Posted by azsugarbear View Post
I'm just shooting from the hip here, but I am not sure the Win Model 70 can stabilize the 100 gr. bullet. If memory serves me correct (and it fails me more often with each passing year), the model 70 barrel has a 1:10 twist. If this is in fact the case, stability may be tough to achieve and hold with a 100 gr. bullet. The Remington 7 and 700 models come with a 1:9.3 twist and I have been able to confirm on this site that there are others out there that can stabilize a 95 gr. bullet and some will even stabilize the 105 gr bullet, although the shooters readily admit it is pushing it to the limit.

Berger's website suggests a 1:9 twist rate for their 95. gr bullet; a 1:8 twist for the 105 gr.; and a 1:7 twist for their 115 gr VLD's. On the other hand, the Lilja barrel website suggests that a 1:10 twist is sufficient to stabilize a 100 gr. bullet. In the end, it may come down to the profile and design of the bullet itself, more than just the weight alone. I would buy a box of the 100 gr. and experiment. It may be that your best round (accuracy) will be in the 80-85 gr. class of bullet.
That's a good point. I was operating under the assumption that the barrel could stabilize the bullet. My understanding is that the 'standard' bullet for the 243 is a 95-100 grain bullet. It would take a 9 twist to stabilize a bullet that heavy.
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  #5  
Old 08-22-2009, 06:54 PM
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Re: 243 Win. 85 gr. or 100 gr.

i have shot nearly 250 coyotes and 21 deer with the 243. i have a sako .they come with a 10 twist and shoot the 100 grain bullets just fine. i have used a lot of different bullet weights for coyotes and deer. the 85 sierra bthp, 100 horn and the 95 partition.
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  #6  
Old 08-31-2009, 03:38 PM
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Re: 243 Win. 85 gr. or 100 gr.

Yes, bbl twist makes a difference in 95-100 gr loads. If you notice Nosler makes the partition in both the 95 gr and 100 gr depending on if you have a 1:9 or 1:10.

My personal favorite in the .243 is the Sierra Game King 85 gr. High BC like a BT, but holds together like and AB. Second choice would be either the 95 gr partition or BT, which ever your gun shoots better.
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  #7  
Old 09-01-2009, 05:46 AM
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Location: Kingston, Tennessee
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Re: 243 Win. 85 gr. or 100 gr.

Thanks for all the info. I am headed for the gun shop now to get some shells.
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