View Full Version : imr 4227 40 gr bt

06-15-2006, 02:26 PM
I have been loading the 5.7 for a bolt action conversion I made on a cz 527 this is my rifle data and I wonder if anyone has tryed similar on the five seven

cci 400
10.5 grains 4227 (fill the case )
5 times fired for brass so far
average dev fps 30
average fps 10 shots 2600 (40 gr. balistic tip)
average fps 10 shots 2700 (35 gr. v max)

anyone tried these in the fiveseven I want to use the same load but kinda worried about testing them in a 900$ gun

06-15-2006, 02:28 PM
Welcome to the forum. That looks like it might be a tad hot for the Five-seveN.

06-15-2006, 03:49 PM
sounds a lot hot to me i dont know about the burn rate on the 4227 but we are putting a max of like 6.2g HS6 and having problems with shell extraction as far as the five seven goes now the p(s)90 im not 100% sure what they are running but i believe its very similar to the Five Seven

when you shoot how much does the case deform/elongate? and are you having any over pressurization problems with it ie. is the primer still there lol,

im not knocking yr load at all just asking questions cause it sounds good as long as pressure isnt to much, and i bet if u went to the 30g TNT's i bet u would be pushing 3k out of it

also where are my manners welcome to the forum :welcome: :MM

06-15-2006, 04:44 PM
I was trying to be polite. :D

06-15-2006, 04:51 PM
10.5 gr 4227 is a full case no elongation or deformation of brass "bolt action" primers are still rounded around the edge so im not thinkin presure is a problem 4227 is way slower than hs6 13 places on a burn chart this probably wont be very fast

I worked up from 7 gr and the neck did not start to seal well until 10 grains 4227 10.5 gr is a compresed load good news is you cant over charge it

I dont think the 30 gr will be very much faster than the 35 gr at 2700

h110 would be faster with this load and it is dense so you could get more in it I am mirroring 22 hornet data but the case volume is a little less. even so the cases are tougher and more efficent so velocity is 22 hornet standard from a 21 in 1 in 14 bbl

06-15-2006, 05:12 PM
It might work great for a bolt gun, but I don't think I'd want to try it in the pistol.

06-15-2006, 06:05 PM
hmmmm im not sure still tryin to decide if this is worth the test could be expensive but we will see

06-15-2006, 08:29 PM
I would say to start out at a much lighter load, and work up from there - the barrel length and actions of the weapons in question are so different that this sounds like grounds for some common sense.

Of course, if you can develop a load that is driving a bullet at 2500fps out of the five seven, and isn't a one time trick (i.e., blown up gun or maimed shooter), then I want to know the formula.

06-16-2006, 10:19 AM
Well comparing the performances of the P90 (blow back action 16 -1/2 inch or less barrel), Five-seveN (delayed blowback, shorter barrel), and a bolt action rifle (locked breech with a 21 inch barrel) is not going to give any similar results. 4227 is a better rifle powder, not often used in shorter barreled handguns. Pistol powders are usually faster burning because of the short time in barrel makes slower burning powders a bit wastefull. Also the Blow back and delayed blowback actions will not be able to contain the round as well as the locked breech rifle - so P-90 pressures have to be kept down much lower than in the bolt gun. The result is that one would expect higher velocities from the bolt gun than any of those acheivable in either of the two other platforms. Also a "hot" load for a P-90 wil only be warm in the Five-seveN, and downright mild in the bolt action. Conversely a hot load in the bolt gun would NOT be a good load to pop intio the P-90 mag.
But a bolt action repeater chambered for this round would be a great "little" walk around varminter with a lot of room for extra shots in the magazine.

06-16-2006, 11:35 AM
hey vibe are you the same one on ar

the common sense thing is true this is not a very hot load at all the powder is prety slow I have no real doubt that h110 or hs7 I can push 3000 in my rifle but not in a fiveseven

im doing the math now to determin if 10.5 gr 4227 will work in the fiveseven I think it will not hurt the gun but will be slow compaired to other faster powders

I am also working with a guy to make a mag adapter for the remington 700 as bolts and bbls are avail for that action it would be nice to have a load that they shared as well as magazine

06-16-2006, 11:55 AM
hey vibe are you the same one on ar

On AR, Saubier, Varmint Als, RFC, FFF, Benchrest.com, and a few other places as well. I'm watching your progreess rather closely since this is a project I intend to pursue soon.

06-17-2006, 01:02 AM
Maybe I'm stating what you all know, if so sorry for the repetition. But it seems from what I've read on the forum the general practice is to start with a significantly reduced load and work up. Works well with pistol powders, but some rifle powders are tricky. I think folks need to be careful (or avoid) using H110 or 296 in the 5.7x28 until some Hodgdon (Winchester) data is available. I recall reading (I think on this forum somewhere) that some guy blew up his FiveseveN pistol with H110. This caution is from the Hodgdon website:

"H110 Loads should not be reduced more than 3%. Reduce H110 Loads 3% and work up from there. H110 if reduced too much will cause inconsistent ignition. In some cases it will lodge a bullet in the barrel, causing a hazardous situation (Barrel Obstruction). This may cause severe personal injury or death to users or bystanders.


Be careful with this stuff. If it doesn't go bang, check it out before sending another down the barrel.