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Discussion in 'Long Range Hunting & Shooting' started by trueblue, Feb 4, 2010.
Will a 1:10 twist stabilize the 300gr smk and why is everyone using 1:9.3 twist?
I've had two different edges w/10 twist barrels they both shot them good. I'd imagine everyones going to the faster twist for the wildcat bullets.
The 1 in 10 twist is the best all round twist for 200 gr to 300 grain bullets, But if you are
only going to shoot 300 grain bullets then the 1 in 9.2 ,9.25 or 9.5 would 'probably" be
better. (No proof of that just a hunch)>
If you are planning to build a monster 338 (Excalibur or bigger the fast twist is not nessary).
J E CUSTOM
With a .338 Edge or similar I think you will have no problems out to 1500 yards with a 1 : 10 twist and the 300gn SMK.
We use a 1:10 on a 338 Lapua using 300grn SMK's. No problems with stabilization so far. I know it is not a far shot, but I picked an empty shotgun shell off of a backstop this past weekend at 100yrds through the middle dead center with the described rifle and bullet above.
The 338 edge shawn at DE built me is a 1-10 twist , shooting the 300smk, no problems to report.
This is only my opinion so take it with a grain of salt but I wonder how much of this 9.2, 9.3, 9.whatever stuff comes from some of these computer software programs that you input the information and it calculates "the perfect" twist rate.
I am always open for something better but when you have guys like Shawn Carlock, Kirby Allen and Dan Lilja all saying 1-10, well, that's good enough for me.
My 338 Lapua has a 10 twist lilja 27 1/2". All I shoot is 300 smk's. Yesterday I was tsesting a new scope for it. 8-32 x 56 NXS. I only shot 1 three shot group at 1008 yards. pic below. I would rather be lucky than good. But the two previous groups I shot at this same target were 3 shot groups that all 6 fell into 5" shot on two different days. So I say the 10 twist is fine with 300 SMK's. But if you would ever want to go with longer custom bullets a 9.5 would probably be better. I should also say I have shot a 36" gong at 2100 yards with this rifle and was pleased with the number of hits.
I was wondering if the 9.3 twist would help going through the transonic and may lessen the effects you saw at 2285 yrds.
A good share of the 338 Norma Mags I have read about, which seems to be designed around the 300SMK, run the 9.3 twist.
Granted that this would be out of the norm for most shooting.
I think the 1-10 is pretty much the standard for 338 and there is surly a reason for thatlightbulb it works
The higher the BC the tighter the required twist will usually be. There will be some new high BC bullets coming along requiring a 9 twist or better, If you want to take advantage of them, then you'll need the appropriate twist. If I get a barrel chambered for 338 it will be a 9 twist if not an 8. I am waiting to see what happens in Las Vegas next month and see what Noel Carlson is offering.
Who DAT? Never heard of him. Educate me please!
Brew up a pot of coffee and read this thread...
Then read the recent HAT threads (not the popcorn one)
Your not kidding about the coffe, I'm going to need a lot of it!