.308 230 grain berger hybred load data?

A wee bit heavy for .308 don't you think? I guess if you have a long throat it might be worth a try, but loaded to anything near normal COL your not going to get much vel. Are you/were you a gunner?
 
its definitely a big bullet, I'm looking for how much powder i should use. i know the bigger the bullet the less powder you use. but i don't have any data and i don't want to use too little. and i was a tank driver.
 
I concur with everyone else. I have tried 208's out of my .308 and I had a very hard time of getting an acceptable velocity without having pressure signs.
 
Canadian_Soldier246 said:
hodgdon h335
Click to expand...

Canadian_Soldier246 buddy, these guys don't know... There is a CGN member WG300 he's a French guy dare eh- why not send him a PM. Nice guy and he is cranking heavies and takin names doin it.

He has big wisdom, big ju-ju magic... you might check out some of his posts about it.
 
Last edited:
He's shooting 200s, but yes, he is driving the snot of out of them. There are a couple of guys from Quebec using 210s and 215s this year, but I've not heard of anybody having luck with the 230s. If you've got a long enough throat go for it though; if it was me I'd start with Reloader 17.
 
Canadian_Soldier246 said:
hodgdon h335
Click to expand...

Your powder choice is on the fast end of the spectrum for that heavy a bullet. As suggested, RL-17 or some thing similar in burn rate would be more appropriate. 2300fps is likely what you'll achieve. Even at such modest velocities the wind drift numbers are very impressive, however as I said before I dont think this is an optimal bullet for a .308 case. Key word here(BadAsMo) is optimal.

Goodluck.
 
US Nationals last Sept and yes, some shooters are trying to make the 230's work.

NO data nor experience but look south for some info.

Assume you are looking for a single shot F TR type rig?

Send me a PM or email if you want to chat.
Jerry
 
There was a time when nobody could shoot 90 grainers from a 223.

Now the challenge is 230s from a 308.

Somebody might nail it yet.
 
I have a buddy shooting them out of his 308. He is using 43 gr. of Varget and getting ~2500 fps out of a 31" Krieger barrel. He prefers the 215s with 44.5 gr. Varget at ~2650 fps. His chamber was cut with a reamer specifically designed for this bullet. If your throat is shorter, these loads will likely be too hot (possibly dangerous) in your rifle. Approach it like wildcatting.

If you go on Snipershide, there is a user called "MontanaMarine" who likes to experiment with the heavies. He's posted data for loads using the 220 SMK and 225 Hornady. He may have tried the 230s.
http://forum.snipershide.com/range-report-exterior-ballistics/60608-308-win-220gr-smk-rl17.html
http://forum.snipershide.com/range-report-exterior-ballistics/105797-hornady-225gr-bthp-308-win.html
 
I Think Rick at Alberta Tactical was having good results with heavy bullets in his 308. I can't remember the exact weight he was using, but at the time I thought they were heavier than anything I'd ever tried.
 
when we are looking to shoot heavy's with a small case like a 308, we need to take every bit of case capacity we can get. Throat have a huge impact of course and you are looking to get as minimal contact between bearing wall and neck. If you have a OAL of 3.175 with a 230 (its the same dimension as a 215 but the filling is heavier), its getting close of max internal volume. Some shooter go even higher than that but there must be a point were we don't want do go too long on throat in relation of contact between case and bullets. This throat should provide 0.100contact between bullet and case +/-

So now we got the throat, and max internal volume, we need to be aware of reloading technique to optimise powder column inside a case by using a drop tube. By doing that, H4350 become a proper propellant with its slow burn rate.

I think numbers that Kombayoch been showing are realistic if the pipe is long enough. I've tried even slower than 4350 without any success....just way too slow

A relaoder should recognize the CRITICAL relation between a burnrate and bullets in any given specification (bore size, neck tension,etc...).

this is my humble opinion
 
Its not just the burn rate, but also the composition of the powder. Both RL-17 and N550 are slower than 4350, but will deliver higher fps. with the big pills (even in a short barrel). They are double base powders whereas 4350 is a single base powder. The double base powders generally give you more velocity, but their temperature stability is usually not as good.

RL-17 gives you amazing velocity, but your load my un-tune itself (or worse) if the temperature changes by a lot. Thats why my buddy is running Varget...
 
i'll correct with the burning rate as RL-17 and H4350 are very similar as N550 (N150) are way faster. I know chart are saying your statement but my tests been showing something else. Both N150-550 are dam hard on the shoulder.

I`m well aware of double base powder but for myself, i'm not willing to pay the price of having an unstable load for 75fps gain. If you dial this 75fps gain within a same bullet, the impact is not good enough to make me switch...but that`s just me

Next winter, i'm planning to build a chart correlation with temp variation and velocity and try to bring that table over a year or so...with RL-17. This one look a bit more stable than N550..still to be confirm of course.
 
I probably have some pressure traces kicking around on the hard drive somewhere for RL-17 and N550 with 208/210 gr. bullets, and N550 is faster than RL-17. I didn't try any 4350 since others had already told me that it wasn't working for them. I might have some data for RL-17 and H4350 in the 6mm though...

It isn't hard to run a controlled temperature test. It only requires 15 rounds of ammo, a chrono, a couple coolers, some ice and a heating pad. Soak the 3 batches of ammo at hot, cold and ambient temperature for at least two hours (5 rounds of each). I use a cooler with a heating pad for hot, the freezer in the clubhouse for cold (cooler with ice works too - keep the ammo in a bag), and just sit the rounds out in the open for ambient. Temperature is measured with thermocouples and/or mercury thermometers. Then, you fire them one round at a time in a round robin sequence (ambient, hot, cold, ambient, hot, cold...). You let the barrel cool in between each shot. When you fire each round, you just transfer that round from the hot/room/cold storage to the chamber and fire it through the chrono as quickly as possible. You don't want to give the rounds any time to change temperature internally due to contact with the chamber. I set the scope on the lowest magnification and just make sure I'm sending the round through the sweet spot of the chrono (no groups). You basically want to be the Jerry Miculek of loading a boltgun and firing it through a chrono. Best done on a short pistol range, close to the berm. Record the velocities and temperatures and plot them to a line chart. From this you can derive the change in fps per degree easily and compare different loads.





X is deg. F, Y is fps.
 
did you manage to establish a correlation with your precision node with a table like that and keep precision going from weekend to another ?
 
You must log in or register to reply here.
Back
Top Bottom