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All Springer/NP/PCP Air Gun Discussion General => Air Gun Gate => Topic started by: cosmic on November 30, 2012, 12:42:02 PM

Title: No 7MM big bores ?
Post by: cosmic on November 30, 2012, 12:42:02 PM

It seems there is no 7MM big bores out there.. Also cast 7MM bullets seen to be few.. Is the bc of a .308 better at low speeds? It seem no one mentions what the bc is at a given velocity for that slug at a velocity of say 1100-1400 fps.. I do know its more than that, somewhat morre like a drag coefficient of aerodynamics.. The 7MM has always been my favorite for powder burners.. Any opinons on this ? How about a Jack Haley in 7MM..

Title: Re: No 7MM big bores ?
Post by: rsterne on November 30, 2012, 02:17:10 PM

Bullet availability may be the problem.... As an example, Lee only offers one weight in 7mm, a 130 gr., which is very long and would need a fast twist.... This compares to seven in .30 cal including the 113 and 120 gr. which are a lot shorter....

Bob