Tikka 243 - pet loads - heavier pills

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Re: Tikka 243 - pet loads - heavier pills

Post by duncan61 » 03 Jan 2019, 9:12 am

Good advice SCJ.I am hoping to develop a 90gn target load for my .243 as we are going to a range soon and Brett has a .243.I only have a Howa 1500 with a 22 inch barrel.The range we are going to does 100-600 metres.I will be getting more 2213sc and Berger bullet charts come with a recommended twist rate 1:10 should suit a 90gn pill.I have a standard a load for .243 for hunting using 80gn PSP but am seeking a better group which is always rewarding.45gn 2213sc gives 3010fps which is where I will start.Do you believe faster is better for grouping???
.22 winchester .22hornet .222 .243 7mm rem mag cbc 12g
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Re: Tikka 243 - pet loads - heavier pills

Post by duncan61 » 03 Jan 2019, 9:13 am

I will have my Sendero 7mm Rem Mag in the car just for fun
.22 winchester .22hornet .222 .243 7mm rem mag cbc 12g
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Re: Tikka 243 - pet loads - heavier pills

Post by SCJ429 » 03 Jan 2019, 4:14 pm

There are a few reasons to go as fast as the case will let you, the BC of your bullet will be higher for longer. The bullet works better when it hits something. For accuracy, it is harder to get consistant pressures when the case is only 2/3 full. If you know how fast you can go and you find a node for example at 50 grains, 3200 fps and one at 47 grains, 2900 fps, I would use the one that is fastest to take advantage of the BC and hitting power.

I use Retumbo or 2225 in my 243, not a powder you usually associate with a 6mm but the 243 is ideal for this slow powder when using 105 or 107 projectiles.

Nice Sendaro in a Cool caliber, why can Remington do such a good job with the Sendaro and 5R but make all their other rifles so poorly.
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Re: Tikka 243 - pet loads - heavier pills

Post by duncan61 » 03 Jan 2019, 6:28 pm

Thread hijack.Short story on Sendero It used to be hi power/low power here in the 90s and Hornet was the cut off.To get a hi power rifle you needed a lot of land and all sorts of mythical powers.What I did was applied for a damage permit for our Kangaroo problem on our hill block then applied for a hi power rifle.The rifle I chose was a brand new Ruger lightweight in .222 S/S because it was shiny and I am a crow.Then I got in to F-class optical and rolled up at the range to become world champion.The target was 400 metres and my first shot hit the dirt at 250 metres O.K. I wind up scope 6x40 fixed scope stops winding.Next shot I kick up sand under the target.To land on the three foot target I have to hold over 2 feet and am guessing where it is.Probably not going to be world champion today so Monday morning at smoko I go to LGS in Bunbury and look at ballistic charts and decide a 7mm Rem Mag will do 1000 metres easy so I get back to work and the builder asks if I found what I needed and I declared what I needed and the Electrical contractor told me all about the one he built and I purchased it of him and have never looked back
.22 winchester .22hornet .222 .243 7mm rem mag cbc 12g
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Re: Tikka 243 - pet loads - heavier pills

Post by SCJ429 » 04 Jan 2019, 5:54 pm

That is why I like to buy used, the rifle comes with a story and someone else ironed out the bugs for you. Nice work.
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Re: Tikka 243 - pet loads - heavier pills

Post by bigpete » 04 Jan 2019, 7:55 pm

Bit of load development plus seating closer to the lands and I've got em shooting fine,as per usual... :thumbsup:
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Re: Tikka 243 - pet loads - heavier pills

Post by SCJ429 » 13 Jan 2019, 8:24 pm

southeast varmiter wrote:Like another thread I’ve commented on, the problem is your bullet jump.
You need about 15 thou off the lands with 243 or 7mm08.
Heavier bullets get too close with COL around 5 thou.
Try less powder and deeper seating the heavier pills to 15 to 20 thou.


I tried a jump test today and the results were surprising. It was hot and windy so no personal best groups. I tried a 10 thou jump, 40 thou, 70 thou and 100 thou. Best ES was 12 from 10 thou jump and the worst was 22 from 40 thou jump. Best group was .320 from 100 thou jump but conditions were at their best, worst group was .570 from 10 thou jump but mainly horizontal dispersion.

The bullet was a Sierra Match King don't mind a bit of jump, the thing that surprised me is I lost nearly 100 fps when jumping by 100 thou. I would have thought the speed would have gone up.
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Re: Tikka 243 - pet loads - heavier pills

Post by Express404 » 14 Mar 2023, 2:32 pm

What's ES and SD..?? young bucks (YB)..??
Last 40 years I thought SD was sectional density and that don't change ...
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Re: Tikka 243 - pet loads - heavier pills

Post by animalpest » 14 Mar 2023, 3:08 pm

Express404 wrote:What's ES and SD..?? young bucks (YB)..??
Last 40 years I thought SD was sectional density and that don't change ...


ES is extreme spread (i.e. fastest to slowest )
SD can be sectional density, or can be Standard Deviation. When you have a standard deviation close to 0, it indicates that the muzzle velocities tend to be very close to the average, meaning they're very consistent in velocity. A chronograph will work out SD for you.
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Re: Tikka 243 - pet loads - heavier pills

Post by SCJ429 » 14 Mar 2023, 6:43 pm

Yes, SD from a statistical point of view is Standard Deviation. The chrono spits out the stats which makes things easier.
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Re: Tikka 243 - pet loads - heavier pills

Post by animalpest » 14 Mar 2023, 7:09 pm

SCJ429 wrote:Yes, SD from a statistical point of view is Standard Deviation. The chrono spits out the stats which makes things easier.


Yeah, that's what I said :roll:
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Re: Tikka 243 - pet loads - heavier pills

Post by SCJ429 » 14 Mar 2023, 8:43 pm

animalpest wrote:
SCJ429 wrote:Yes, SD from a statistical point of view is Standard Deviation. The chrono spits out the stats which makes things easier.


Yeah, that's what I said :roll:

You sure did.
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Re: Tikka 243 - pet loads - heavier pills

Post by animalpest » 15 Mar 2023, 7:05 pm

:lol: SCJ429
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