Safe Cat sneeze/whisper load data 7.62x39 and 300 whisper

[incognyto]

Here is a whole bunch of loads that I have gathered up in the last few week's in preparation of
makin some nice gallery loads maybe everyone at the range will not care if the sks is shooting
if it sounds like a 22 hehe almost all the loads are 7.62x39 related 19" barrel I believe, some 22" whisper
data that I think may be relevent, even a bit of 44 mag pistol data (they seem to have relatively the same
case volume), alot of this data I'm looking for is with reddot and vv n310, both really fast pistol powders.
it seem's as though imr sr7625 would have been a better choice slightly slower and chamber pressures don't seem
to spike quite as high. Going with the data from cronhelm (http://members.shaw.ca/cronhelm/index.html Project 7.62x39 page has quite a few of the loads printed below) I figured hey there going up .5-1 gr of powder every 20-30 grains of lead in front and staying just under 1000fps with N310 and reddot, Although n310 spikes the chamber pressure higher than reddot, so 8grns of vvN310 would do a 220 grn boolit. I'm really glad my brother put the scare into me about pistol powders, putting that load into quickload seem's to put
the chamber pressure right close to Pmax (chamber pressure), damn... I was wanting to do what everyone say's and just start HIGH and work my way down!! that load if the trend is corrent would still be under 1000 (it say's 1230
quickload but most of these loads show that speed but actual shot data (from internet haha) is showing slower
speeds I'm stuck with sierra 220 gr round nose bullet's for now (.308) but I'm sure I could scoop some 165gn hpbt
for testing but I want to stay heavier with the fast twist in the sks. SOOOOOOOO as to make this chit not so long
winded and see what everyone else thinks... I'm going to try 6.75grains of reddot behind a 220 sierra RN flat base
NOT touching the lands. Chamber pressure in quickload shows 39000 ish psi (51500psi being max), and hope for the best, my bro say's that seem's reasonable since he's done some bluedot low recoil loads before, not with heavier bullets however. He also thinks that the calculator seem's a little out to lunch, but it is better to be on the safe side right!?? any other info, insight, or expieriences you think I may need to know please do, thanks in advance. safe shooting!! -guido

IIRC quickload said something like 15000 psi of pressure still left after 24" barrel on a 338 lapua magnum. that's quite a pop when the bullet exits
with the load's below it say's 1500psi and sometimes less!!! no wonder
there supposed to sound like a 22 short!!


180gr RN - Red Dot 6.0gr = 930 fps
150gr RN - Red Dot 5.5gr = 980 fps


whisper data from reloadersnest
300 whisper 6.5gr reddot 1064fps 22" barrel 175gr sierra matchking
7.0gr reddot 1126fps 22" barrel 175gr sierra matchking

data from cronhelm @ shaw.ca
200gr cast - Trail Boss 5.5gr (better load density) = 900 fps (Steve VanSlyke)
200gr Lapua - N310 7.0gr = 970 fps (very quiet through suppressor)
200gr Lapua - 700X 6.0gr = 985 fps (very quiet through suppressor)
180gr RN - N310 6.0gr = 1000 fps
180gr RN - Red Dot 6.0gr = 930 fps
180gr RN - 700X 5.8gr = 970 fps (very quiet through suppressor)
150gr RN - N310 5.5gr = 990 fps
150gr RN - Red Dot 5.5gr = 980 fps
150gr RN - 700X 5.1gr = 990 fps


gunloads.com or something can't remember
180gr JSP IMR-SR7625 6.3 g = 980 fps 180grn jsp

pistol data to compare too

from alliant webpage (looking for reddot loads) pistol loads
""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
44 russian 3.8gr reddot 796fps 200gr rcbs cast
45 auto 5.1gr reddot 841fps 230gr LRN
44 s&w special 5.9gr reddot 868fps 200gr GSHP
44 rem mag 6.5gr reddot 905fps 240 gr cast LSWC

 

[steve4102]

Can't speak for the SKS as I do not own one, but I do have a Ruger Mini-30 7.62x39. I have experimented with reduced loads using fast pistol powders such as Blue Dot. Although they went bang and were very accurate they did not cycle the action. Fast pistol powders do not generate enough port pressure(gas) to cycle the action of the Mini-30, your SKS may be different.

Please do not confuse port pressure(gas) with chamber pressure. A powder that produces very little port pressure can easily produce excessive or high chamber pressure at the same time and still not cycle the action.

Be very careful, take extra steps to make sure you do not load a double charge, bad things will happen if you double charge with fast pistol powders.

 

[Zak Smith]

I have loaded subsonic ammo in .223 and subsonic and supersonic loads in .300 Whisper/Fireball. I've also loaded for cartridges that had no known load data yet.

even a bit of 44 mag pistol data (they seem to have relatively the same
case volume),

This is not the right way to think about it. You are right that case volume matter, as well as bullet mass, but the aspect that must be taken into account in addition to those is the volume to bore area ratio.


Anyway, make sure to not use too much powder and always check the bore for obstruction after every round.

 

[incognyto]

I'm very aware that the sks will not cycle, I will be taking the operating rod out of it to insure that it doesn't get damaged. I am also aware of the possibly really high chamber pressures, which is the main reason for my post, I'm definatly open to using some slower powders, imr sr7625 seem's to come up a bit ... and trailboss seem's quite popular, I have had really crappy luck finding loads for red dot and 220's, but we'll see!! thanks again for the reply's.

it seem's to be like walking a wire.... to little powder and stuck boolit. to much powder and stuck in hospital!! :banghead:

 

[FROGO207]

In several different weapons the trailboss route has worked well for me. It is a fav in my 30 carbine pistol rounds at approx 650 fps for indoor 50 foot range. I had started out with Bluedot but trailboss is the answer.

 

[farscott]

I have a question related to twist rates and the velocities posted by the OP. I believe the SKS twist rate is one turn in ten inches or so. As such, will those heavy bullets be spin-stable at those velocities? For .300-221 Fireball, it is commonly accepted that one needs a twist rate of 1:8 or faster to stabilize the 180-grain and heavier bullets at subsonic velocities.

My personal Bullberry .300-221 Fireball barrel has a one turn in ten-inch twist rate, and I ordered it for supersonic applications. I want to experiment with light (less than 168 grain) bullets at subsonic velocities, but that project is waiting in my to-do list.

 

[incognyto]

I think the twist rate of the sks is around 1 in 9 I'm going to be testing the 6.75 grains of reddot right away I'll post data as soon as it's done.

one thing i'm quite curious about is weather or not you could just 308 dies for neck sizing 7.62x39 brass then I dont have to buy dies

 

[ScratchnDent]

Last week, I loaded 2 rounds of 7.62x39 with 6.9 gr of Unique, CCI #34 primers and 170 gr, flat nose 30/30 bullets. Unfortunately, my chrono malfunctioned for both shots, so I didn't get a velocity reading. They were very quiet, and shot to point of aim at 35 yards, leaving perfectly round holes in the paper, so they appeared to be stable at that range. I used an SKS with the op rod removed to test them, so I don't know if they would have cycled the action.

Anyways, the results seemed promising, so I will load up a few more and try to get more data.

 

[steve4102]

one thing i'm quite curious about is weather or not you could just 308 dies for neck sizing 7.62x39 brass then I dont have to buy dies

Neck sizing is not a good idea for any auto-loader. They lack the powerful camming forces of a bolt-action.

 

[incognyto]

if the brass have been fired from this rifle I would assume that they would fire again in the same rifle, also with these test loads it will be single shot so each load will be hand fed and any problem's dealt with right away. either way for now I'm trying pulled bulk ammo. the old primer removed and the nipple milled and new flash hole drilled. .100 for flash hole. still haven't shot any but hopefully soon. it's good to hear ScratchnDent that your having good luck with this. I have access to 180 and 165's but there boat tails so I'd prolly load them backwards and see if they stabilized. I also still only have reddot. so anything I try I might wd40 the barrel and shoot it with a string. if it doesn't blow up or get stuck i'll try the chrono happy shooting

 

[anubismp]

so out of curiousity and not obviously without thinking about the warranty on a can, could this function like a 300 whisper where you can shoot it with a solid 9mm can?