The Greenhill Twist Rate Method is barely a recommendation verified by years of usage. Though the evidence is in the shooting. I am only suggesting that you just not prevent tests with just the sixty eight gr bullet but include lighter (shorter) bullets also.

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Yep, I've it on my favorites listing and like the many cartridge diagrams he has, it's very a great list !!

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It absolutely was ninety degrees out for the duration of this take a look at.  Gun was Tremendous warm.  Didn't make a difference, it just stored grouping restricted time and again.

Insert to estimate Only demonstrate this person #six · Jun 1, 2015 (Edited) Here's a chart of bullets and essential minimum amount twist prices As outlined by Greenhill based on bullet diameter and length (excess weight isn't from the method but needless to say heavier bullets could be lengthier).

This chart is probably not any more correct than every other but, when compared with most, it does give appreciably additional information regarding how the relative burning charges were being derived and it does relate to not less than just one authentic-planet scenario.

For those who have W748 within the shelves, It really is a very good powder inside the .222, Specifically with 50-55gr bullets. It's going to glimpse the best at or close to the major close of your load vary, and will likely be dismal for accuracy within the reduced end. Exact Product or service has actually been normally offered, And that i get firstclass benefits with AA2230, AA2015, and AA2520.

I couldn't see an excessive amount of a distinction. Perhaps in the primer space - the perimeters of my primers were rather less round, although not what you could possibly phone "flattened". So, I fired off about 30 rounds out of your Ruger and my BAR.

Designed rounds in Indiana if the temp was during the 60s, kind of stunned to determine stress indications even though PDogging in SD if the temp was winchester 748 load data from the 90s. Which is only about thirty-35 degrees. Under no circumstances had that take place with H335.

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Load at your individual hazard.  What we load does not Blue highlighted rows are commercial, premium bullets for comparison.  Great velocities.  Very good Standard Deviation, That is a very good powder it is possible to be content to possess and use for 5.fifty six. 

Federal 748 winchester situations have similar capability as military services circumstances but are weaker and immediately after a single firing, the primer pockets turn out too loose. Nosler situations are created by 748 winchester Federal and so are the identical.