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Old October 8, 2005, 01:29 PM   #1
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100 gr 243 loads

I am shooting 100 gr Sierra Grand Slam bullets loaded with Remington brass, 42.5 grs of 4350 powder and CCI primer. Getting a calculated velocity of 2805 fps. Seems to me that the load should group better than it does (-1") , Does anyone have afavorite load for this cartridge--for deer hunting.
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Old October 8, 2005, 03:41 PM   #2
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As long as it groups under 21/2 to 3 inches at 100yrds it is accurate enough to 300yrds(about the max of the 243), this would be an excellent deer load.
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Old October 8, 2005, 08:08 PM   #3
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man if it wouldn't group less than 3" I believe I would throw it a way. I got an ole 743, 30-06 with serial no 8130 that will do better than that. Am I missing something here?
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Old October 8, 2005, 08:33 PM   #4
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What rifling twist? Did you work up the load or just pick it? How heavy is your trigger? Stock screws tight? Chances are your rifle just doesn't like that load though.
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Old October 9, 2005, 02:37 AM   #5
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Firstly, the 100-grain bullets is the uppermost weight the .243 Win will handle. So you're getting to the upper edge of the envelope for this cartridge. When this happens accuracy can erode. If it shoots lighter bullets with better accuracy, this is most likely the problem.

Second, if this is an older rifle the rifling twist may be just a bit slow. The .243 Win used a faster twist then the 6mm (.244) Rem which is why the 6mm won't shoot the 100-grain for crap. But if it is an older .243 the twist may be a little slower than a newer gun.

Third, make sure your rifle's throat is long enough for the 100-grainers. If the bullet is being jammed into the rifling when chambered it can cause poor accuracy.

Forth, what T. O-Heir said!
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Old October 9, 2005, 09:55 AM   #6
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I got me a M70 .243 that has done such a great job over the years that it now has another barrel do to throat errosion. Don't give up on it!! I may be misunderstanding your bullet choice: Sierra "Grand Slam," would that be Speer instead??
Just to let you know if it is a Speer, I could not get them to group in mine either. I ended up with the 100grn Nosler Partition. I wanted a round that would stay together and hold velocity for a clean wound channel. Going back through the data it is looking like W760 and IMR4831 were the powders that brought about the better accuracy in that barrel.
I need to get the new barrel blued and start loading/testing it. (been busy with a No.1 7mmRM and T3 25-06 that will be this years choice for hunting)

Good luck, Smedley

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Old October 9, 2005, 10:40 AM   #7
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Thanks Smedley, right its a Speer. and I will try some of the Noslers. I make some long shots and like to know that if I hold it I will hit it.
For the rest of you guys, thanks for looking and suggestions. The rifle is shooting groups fair but thought maybe someone is into punching holes and could suggest a better load. Thanks.
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Old October 11, 2005, 06:50 PM   #8
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I use 95 gr Nosler ballistic tip with 42grs of H4350 in my 243 shoots better than 1" at 100yds, just sent it for rebarrel after 25 yrs but still groups same but a devil to clean now. Also Speer 85gr spt boat tail with 46 grs of H4350 groups same and kills deer fine. Grand slam is a bit over the top for deer as well as costing more. I would try more than one bullet as the 243 is famous for being fussy over bullets, even 2 rifles of same make may not like the same bullet, mine shoots crap with speer 105 / 100gr, but quite good with hornady 105 gr rnd nose!
The best ever load in it for accuracy, is Speer 75gr hollow point (not the TNT) and 48 grs of H4831 1" grps at 250yds! but a bit light for deer, good on varmints though.
The 4350 either Hodgdon or IMR is rated as best powder for 243 followed by 4831 the same. I always use CCI BR primers
Give it a bit more time , I bet you find a sweet load for it.

Last edited by Foxman; October 12, 2005 at 03:01 AM.
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Old October 12, 2005, 12:37 AM   #9
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your barrel twist is very important - heres a list to start with
IMR-4350 is a great choice but you might want to try Varget...seens to produce higher velocities. also try using a federal 210 primer

8" Special for VLD bullets over 100 gr

10" For bullets up to 120 gr.
and VLD under 100 gr.

12" For bullets up to 85 gr.

13"* For bullets up to 75 gr.

14"* For bullets up to 70 gr.

15"* Special for bullets up to 70 gr.
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Old October 12, 2005, 03:01 AM   #10
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I like and use Varget in 22-250 and 17 rem. reason it produces higher velocities is it is less temperature sensitve so higher loads can be used. I didnt find it improved accuracy in the 243 , the 4350 and 4831 did better and velocity difference didn't give any real difference in trajectory, for loss of accuracy.
My barrel is a 1-10" , big Jack doesn't say what twist or rifle he has so can only generalise on what works. Most I have come across have 10" twist odd ones 9" and once came across an old european rifle with 12" twist which of course would only shoot 70- 85 gr bullets with any accuracy.
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Old October 12, 2005, 11:47 AM   #11
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I like the Sierra bullets in my .243. I'm getting really good groups with a Sierra 85gr HPBT Gameking bullet and 36.3gr of IMR 4895. This powder is also great in my 30-06. Sierra has a 100gr Gameking bullet, maybe give that a try with some IMR 4895 and see what happens.
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