What's the diff between the Hornady 55gr sp and the 55gr spsx? Both have exposed lead tips and they are of the same design ballisticly . Any help?


TIA 24kilo

I understand the spsx jacket to be even thinner than the sp and have a bit lower velocity rating. Some of the new quick twist barrels are touted as allowing the spsx to come apart at lower than 22-250 velocities .

Well, visually there is darned little difference between the two Hornady bullets. But the construction is different inside.

The SX bullets have thinner jackets. They are designed to open up at lower velocities. They MAY come apart if pushed too fast. This depends a lot on the smoothness of the bore they are fired in.

Hornady recommends that the SX bullets not be fired at more than 3400 fps. At speeds faster than that they tend to disintegrate in flight.

If high velocities are where you are heading, use the Hornady V-Max bullets. They hold up to high velocity and have a higher Ballistic Coefficient than the regular SP Hornady bullets.

I've tried the sx in my mini and a .22-250 and niether would get them to paper consistantly. They were absolutely unbeatable out of a 14" Contender in .223 though! Nate

I shoot a fair amount of 50 grain Hornady SPSX bullets in my .223. Likes Benchmark powder out of my CZ 527. Much more dramatic than the 55 grain SP, which is probably tough enough to shoot white tailed does with a .223. I am a big fan of the SPSX.

55gr spsx
The "SX" in SPSX indicates that the jacket is extremely thin and when it hit will almost EXPLODE.

As noted, the SPSX stands for Super Explosive...it is a very accurate bullet with a great price.....

however, if your 22 caliber has a twist faster than 1 in 12, unless you throttle them down to about 2000 fps, then they will disintegrate about 12 inches out of the barrel...

my Savage has a one in 9 twist, and they were vaporizing right out the barrel, so I called Hornady... their tech told me that the bullet was designed to take a maximum of 180,000 rpms spin out of the barrel... with a 1 in 9 twist, he said I was turning about 275,000 rpm....

at 90 degrees it was coming out of the barrel like your breathe on a cold winter day....

it sure entertains the kids... and they think the 223 is a monster killer if it will vaporize bullets...

I have just bought a box of 50gr SPSX....would they have the same accuracy potential as the 55gr SPSX?
Has anyone noted the effect of velocity on their accuracy ie can they be driven less than max (3200fps for 222 Rem)to achieve good results?

Regards....

...Titan

My 223s, seem to have better accuracy out of the 55 grain SPSXs than they do with the 50 grain SPSX's.... don't ask me why, they just do...

Would the SPSX stand up to 22-250 velocities in a 1:14" twist?

quote:

Originally posted by AZ223:
Would the SPSX stand up to 22-250 velocities in a 1:14" twist?

Keeping the velocity down to around 223 velocities, yes it will... run it at 22.250 Velocities, and a lot of them won't.... some may, but most won't...at least in my experiences