Thread: 20" tikka 7RM load

Originally Posted by McNotty

Interesting that the Hornady book and ADI are three grains different for max charges in the 162.

I’d read some of @gimp reloading posts as well.

I’d just start 2 grains under what you currently shoot-and work up. Seat bullets at max mag length. Once at safe pressure, right velocity just shoot a 10 shot group and if at inch or under you’re good to go.

I'd be somewhat surprised if it groups 10 into under 1MOA. I have data from 33x 10 shot groups from various tikkas and exactly 1 of those groups came in under 1MOA. The average is 1.8

Originally Posted by gimp

I'd be somewhat surprised if it groups 10 into under 1MOA. I have data from 33x 10 shot groups from various tikkas and exactly 1 of those groups came in under 1MOA. The average is 1.8

Interesting what cal 7rem mag or just Tikka in general

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Edit

Originally Posted by gimp

I'd be somewhat surprised if it groups 10 into under 1MOA. I have data from 33x 10 shot groups from various tikkas and exactly 1 of those groups came in under 1MOA. The average is 1.8

@gimp,
But with so many degrees of freedom for the rifle the hand loads and the shooter how do you know what is due to the each factor. I think all cumulative error is all being apportioned to the rifle?


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Originally Posted by Dicko

@gimp,
But with so many degrees of freedom for the rifle the hand loads and the shooter how do you know what is due to the each factor. I think all cumulative error is all being apportioned to the rifle?


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We can take this to another thread probably - but it isn't as noisy as you'd think.


Precision is clearly driven by the quality of the rifle. A precise rifle delivers consistently better precision than an imprecise rifle. Here is a comparison of 10rd group diameter, comparing 16 different .223 ammunition types fired by a tikka t3 (orange) vs another rifle (blue)





and the same comparison using the more meaningful mean radius - the trend is the same





This is just objective data collected for another purpose. However when you collect enough data it is quite clear that most rifles are not as precise as the conventional wisdom would suggest, and if you wish to obtain consistent precision, the first place to start is with a good rifle


It is interesting to note that while ammunition 4 produced a better group out of the tikka, the precision measured with MR is identical between both rifles - group size is sensitive to outliers and only tells you "what you got", rather than "what you can expect"