View Full Version : Which rounds are NO-GO for a 1:7 twist?

10-20-2009, 10:28 AM
As the title says: related to grains (is that the right word?), which rounds are NO-GO for a 1:7 twist?

10-20-2009, 10:32 AM
anything less than 55gr. general rule of thumb...but not entirely true...I would just have that as my minimum

40gr. V-max are known to disintegrate shortly after leaving the barrel...

Bug Splat
10-20-2009, 10:51 AM
sub 55gr rounds can have unknown reaction. Bast case, poor accuracy. Worst case, round spins itself out of existence.

10-20-2009, 11:14 AM
In general stay away from lightweight varmint bullets like the 36gr varmint grenade or the 35gr vmax.

53gr SMKs are fine for a 1:7 and show great accuracy granted you have a good barrel. 40gr Vmaxs will also work fine out of a 1:7. Remember its more about the length of the bullet than the weight. The polymer tip adds more length to the bullet

40gr. V-max are known to disintegrate shortly after leaving the barrel...

Not necessarily...

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10-20-2009, 11:29 AM
Muzzle velocity is a key factor, as well.

When handloading, Speer recommends loading light-weight bullets at no higher than 2800 fps to maintain integrity.

10-20-2009, 11:39 AM
Ive shot 50gr just fine out of my 1:7. I would not go lower probably though.

10-20-2009, 11:42 AM
Not necessarily...

Good to know. Thats the first I have seen of that vid.

I personally cant seem to find paper with light weight stuff. To be honest, I'm not even sure what happens to the round after its fired.:o I'm not sure if it drifts or shreds apart.