Home Forums Hunting & Shooting Ask The Gunwriters Sierra 62gr GK in 1-14"

I asked Sierra if this bullet should stabilize properly in a 1-14" 22-250, at 1,800ft altitute and 50 ºF but so far that have not cared to reply.

By the information the publish on their page it would seem so, but they talk about a semi spitzer design and I woder if they have just cut and pasted the info on their 63gr (real) SMP.

I'd rather ask you before making my purchase, thank you!

Help from anybody, please?

Anyone used them?

Just me, but I'd call.

You can learn more from a conversation than text.
Especially if the answer isn't clearly yes or no.

Unless, judging your name, you are not in the States.

I will follow your advise and give them a call.

I am overseas and except for the time difference I don't anticipate any issues.

Thank you, Dillonbuck!

I can't speak for the 62 grain bullet, but the 63 grain Sierra semi-spitzer will stabilize in a 1 in 14" rate of twist. I shot many of them in a Remington 22-250.

Indeed, but this is much longer, a typical spitzer boat tail configuration and I have doubts it will, in spite of weighing one grain less...
Thank you!

I did a double take, wasn't aware Sierra had a 62 grain GK. The 65 is my favorite .224 deer bullet. Reading the information on Sierra's website, they intend this for slower twist rifles. They recommend 10 twist or faster for the 65 grain, but don't give any specifics for this one. I'd call, and or, get a box and try them.

Brian Litz has the bullet length of a Sierra 65 grain GK at .852, go to Berger twist calculator and plug in .840 or any factor over .830 and you should be pretty close to the length of the 62 GK. Basically I have found that over .800 in a 14 twist doesn’t work, even at Swift velocities.

As I recall, this was the reason behind the 63gr semi-spitzer. Something short enough for the slower twist barrels.

True, believe the 63 Semi Spitzer was about .755 in length which is definitely in the range for 14 twist.

From Sierra´s website, about the bullet:

22 CALIBER 62 GR. SBT
In rifles, the semi-point design allows this style of bullet to expand faster than a spitzer style due to a generous amount of exposed lead at the tip and the slightly larger opening in the jacket. Capable of outstanding accuracy, this bullet can be an excellent choice for varmints and small game in many early 22 centerfire rifles, which have slower twist rates than those commonly used today. The Semi-Point shape reduces bullet length for a given weight, making the bullet easier to stabilize. The penalty is that a Semi-Pointed bullet has a lower ballistic coefficient than a Spitzer-pointed bullet of the same weight. This bullet can also be used in modern rifles with faster twist rates.

They categorize it as a SBT, but then talk about it as a "semi-point" which is what encouraged me to ask...
Will talk to them on Monday and see what they say. In any case, best advise would have come from someone who has actually shot them in a regular 22-250 like mine, proof always being in the pudding.

In the meantime I will use Berger's calculator and see what bullet length it predicts, Swifty52, thank you!

I killed many a woodchuck using the 63 grain Sierra Semi-spitzer bullet. I can't remember one time when that bullet failed to exit, even on a big woodchuck at short range. I have never sectioned one or compared it to the 62 grain Game King, but I wonder how different construction of the two bullets can be. In other words, I think the 63 grain bullet might be a reasonable deer bullet. I shot those bullets at 3,500 fps using a maximum load of IMR 4895. It was an accuracy load in an ancient Lyman manual I still own.

Sierra said “no”.

A 1:10” is required.