Kriss Vector 9mm - What grain of bullet do you use?

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Double A

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I just bought a new non-restricted Kriss Vector CRB in 9mm.
I am curious as to what grain of bullet to use in it.
I have looked through the operator manual and the website, but there doesn't seem to be anything listed for the 9mm. (It says to use 230gr for .45cal)
The store that I bought it from recommended 147gr (so I bought a case), but would like to know if anyone had used lighter bullets and how they functioned out of it.
I would think the lighter bullet wouldn't have as much drop.
It was supposed to be bore sighted at factory, but was about 6-8" low at 25yds.
 
I've shot everything through it, from 115gr all the way to 147gr , these are very light hand loads by the way.
The new enhanced versions don't have the troubles that the first gen .45 acps had. They are very reliable with all bullet weights.

The ONLY thing i had trouble with are flat points, but I think with factory FMJ, you should be fine.
 
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With an 18.5 inch barrel I would think a lighter bullet with less bearing area would be preferable - 9mm was designed for pistols, lengthening the barrel does not help. The longer the bearing area the more likely the bullet will actually be slowed by friction - it would be instructive to chronograph the 147's from a barrel that long. The 147 grain was designed to be shot from an MP5 with a 9 inch barrel, I'm not aware of any 9mm load designed for an 18.5 inch barrel.
 
Suputin said:
Just to be pedantic. "Grain" is a measurement of weight. You wouldn't say, "What pound of bullet to use?" or, "What ounce of bullet to use?" The correct question is, "What weight of bullet to use" and that weight is expressed in grains.
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Thanks for adding absolutely no useful information to this topic.
 
Double A said:
Thanks for adding absolutely no useful information to this topic.
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It is useful information because when someone starts blathering on about the "grain" of a bullet, experienced and knowledgible shooters tune out and all we hear is "blah blah blah." You want to be taken seriously then understand and use the correct terminology. You want to be ignorant .... then keep on keeping on.
 
I've been using mostly 124 gr. in my Kriss 9mm. But I'm going to try some 147 to see if the accuracy improves. Let me get back to you with results. FYI, the Kriss has run flawlessly since I bought it. Close to 1000 rnds thru it and not one issue. 0 FTF's FTE's, etc.
I'm really enjoying the Kriss 9mm.
 
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enefgee said:
With an 18.5 inch barrel I would think a lighter bullet with less bearing area would be preferable - 9mm was designed for pistols, lengthening the barrel does not help. The longer the bearing area the more likely the bullet will actually be slowed by friction - it would be instructive to chronograph the 147's from a barrel that long. The 147 grain was designed to be shot from an MP5 with a 9 inch barrel, I'm not aware of any 9mm load designed for an 18.5 inch barrel.
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NFG, check out "Ballistics by the inch" website. Most 9mm they tried seem to get optimal performance out of a 14 to 17 inch barrel, apparently.

http://www.ballisticsbytheinch.com/9luger.html
 
I've got a deposit on a KRISS 9mm... I would suggest the slowest 9mm pistol powder you can find, also as mentioned above, a lighter bullet would benefit more than a heavier one; the 147's will probably slow down quite a bit. I have a Chrony so whenever I get it I'll run some tests (next year it's looking like.)
 
Well, I don't have a Kriss, but my BRS99 spits out bullets faster than my pistols do. I've tried 115,124, and 147 grain bullets through it and have no issues hitting pop cans at 100m. I'd just buy some of each and see what it likes the best.
 
I'm curious. Why do I only see non restricted gen 2 available? I shot a gen 1 .45 and didn't like the trigger or how the stock managed to pinch my cheek under my earguard. The gen 2 seems to solve these problems as well as adding a more affordable 9mm option. Is a 9mm gen 2 the way to go?
 
Double A said:
I am curious as to what grain of bullet to use in it.

I would think the lighter bullet wouldn't have as much drop.

It was supposed to be bore sighted at factory, but was about 6-8" low at 25yds.
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Are you shooting factory or planning on reloading? Regardless, I'd just start with some cheap Rem, Win, AE, and even some of the steel cased poop if you don't mind the steel cases. Shoot them off the bench and the load that groups tightest at 75 m/yds and is reliable feeding and ejecting is the winner...buy 1000 if you can. Reloading is obviously a bit more complex, optimum burn rate of the powder may be slower than for a 4"-5" pistol, and as enefgee stated the bearing surface of the long/heavy bullet may handicap it.

Regarding drop, up close, lighter will shoot flatter, farther out heavier can shoot flatter, IF, the bc is meaningfully higher than the lighter bullet, AND, the mv is relatively close. You could put the numbers in a ballistics calculator to compare, but I'd be surprised if the trajectory of 115-147 gr bullets would be dramatically different out to 150 yds (I'm guessing this is the max useful range).

Bore sighting just means the bore and the sights line up at X meters, that doesn't mean any off the shelf ammo will zero at the same distance without some adjustment.
 
I finally got out to the range today with my new, GEN2 Kriss (in 9x19.)

I ran some factory S&B 124gn ammunition through the Chrony-Alpha and got an average of 1280fps; this same ammunition will do an average of 1138fps out of my Glock19 TB.

Forget running anything HOT through the Kriss; because the bolt doesn't lock (and the spring is so weak) you run the risk of a KB if you exceed book value MAX. I ran a couple +P reloads and all the brass experienced some disconcerting case bulge. So, stick to factory with this one.

Cheers~
 
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