Does any one have any thoughts on the following?
I have 2 stalking rifles, a Krico 600 series in .243 Win & a Varberger .270 Win. Using federal ammunition in each [100 grains in the .243 & 130 or 150 in the .270] the varberger will shoot both the [older ranges] 'Classic', with a flat based soft point, & the 'Premier', with the boat-tailed Sierra Game King soft point, equally well at 100 meters with the Premier/ Game Kings having the edge at longer ranges - which is what I would expect.
However, my Krico groups very well with the 'Classics'; but the group size is more than double this size when using the Premiers - which is strange considering their higher quality components.
The Varberger has had very little use whereas the Krico has had a lot more rounds through it & I wondered if the barrel was beginning to wear so that the flat based round in the 'Classic' offered a longer bearing surface to the rifling & so out performed the shorter bearing surface of the boat-tailed Game Kings in the 'Premier' rounds, whereas in the much 'newer' Varberger this was not an issue.
Does this seem likely or is it merely a quirk of the rifle or a function of the twist rate?
It doesn't affect my use of either, merely influence my ammunition choice; but if any one has an explanation for this I would welcome your thoughts.
As an aside, do the new Ranges of Federal ammunition approximate to the older ranges in terms of performance & the differences between them, or are they quite different?
Best wishes, Tyke