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Optimum twist rates for .30 cal

Author	Comment
Bubbalufagus	Optimum twist rates for .30 cal	Lead	[-]
Posts: 266 (04/13/10 10:13 PM) Reply Quote More My Recent Posts	Tags : None I have a 300 win mag Ruger number 1 and my buddy has a Savage 111 in 30-06. Both have a 1 in 10" twist rate and we are into handloading and were wondering what weight of bullet would be best suited for this twist rate. We found that my friends Savage shoots horribly with 180 grain but 165 grain Hornady SSTs produce 2" or better at 100 yards. I have not yet tested my no 1 yet as I just bought it. I do have 100 rounds of 165 grain loaded up for it, half Hornady GMX and half Speer BTSP. I hope they do well. The guy I bought the rifle from said he was getting 1/2 inch at 100 yards with that weight load.
jungle jim	Twist Rate	#1	[-]
Posts: 286 (04/17/10 04:09 PM) Reply Quote More My Recent Posts	I have found that a good read for twist rate of any caliber would be Greenhill's Formula. A 1 in 10 twist rate is just fine for a 180 grain lead core bullet in your .300 Win. Mag and should be fine in your friend's .30-06. The twist rate needed for stability is a function of projectile length, caliber, and Twist Rate/RPM. As your projectile increases in length (in the same caliber) it will generally require a faster twist rate. Velocity will also play a role in stability. As velocity increases in a given twist rate the RPM will increase. Your .300 Win Mag. is capable of shooting a 190 gr. BTSP/BTHP with superb accuracy. The Army Markmanship unit uses the .300 Win Mag 190 gr. BTHP with results that win matches. The Hornady 165 gr. GMX bullet is a longer projectile than their 180 Gr. SST because copper is not as dense as lead, which is probably why there is not a 180 gr. GMX bullet yet. Good luck with your handloading and don't give up just because you don't get good results right away. There are so many variables in making your own ammunition that you will need to keep a good log of your loads as you experiment..... Few Things Beat Quality Time The Trigger_____ Jim
Bubbalufagus		#2	[-]
Posts: 267 (04/19/10 07:30 PM) Reply Quote More My Recent Posts	Hey, thanks for the reply. I have not had the chance to try any of my handloads yet, but am looking forward to it. Most of the poor accuracy was from 180 grain factory loads in my buddy's Savage 30-06. I have loaded up 150 rounds of Hornady ftx in 30-30 win for my '94 ae and they work great! Love those Hornady bullets!

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