Anyone tell me how fast a 125g sst will be going in my suppressed 16in barrel in .308 with 38g of 2206h and a coal of 2.75? I’m im looking to get around 2200 as a light load for my boy to shoot and I can use for bush hunting Sika mostly. Thanks
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Anyone tell me how fast a 125g sst will be going in my suppressed 16in barrel in .308 with 38g of 2206h and a coal of 2.75? I’m im looking to get around 2200 as a light load for my boy to shoot and I can use for bush hunting Sika mostly. Thanks
It tells me 2211 fps at just 28,722 psi pressure, with only 79.4% powder burn in that barrel length, so 20% of the powder will be burning after it exits the barrel, might pay to use a Stainless first baffle if you're using a DPT.Quote:
Originally Posted by The bomb
In comparison, if you used 30.5gr of IMR 4198, it would be the same 2217 fps but the powder burn would be 94.25% in the 16" barrel. And i think this has something to do with the better accuracy 4198 gives for reduced loads over 2206H.
Fired case capacity in grains of water? and the actual length of a 125sst? And I can sort the data when I'm home. Also look up Gordon's reloading? It's a free app for your computer, it does what quickload does.
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'Gordon's reloading tool' is what I was after
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Fill the case with water then weigh how much it held?
Yes, but for what you're loading its doesn't really matter, working with the standard H20 capacity in QL will be quite fine, its not like you're loading on the ragged edge of pressure.Quote:
Originally Posted by The bomb
I was going to post up a similar thread, hope the OP doesn't mind me jumping on here.
@GWH could you run this please?
.270 Winchester, 145gr ELD-X, 59.5gr AR2213sc, 22inch barrel suppressed, 3.330 COAL.
@mawzer308 Too hot for my tastes, looks like about 3050fps with pressure at 68,000psi, bit will depend on case capacity etc but not much margin for error
Cheers mate that's interesting, according to the Hornady load data, I'm .5gr under max. Have validated drops and it worked out to be 2940ish fps. No adverse pressure either.
@mawzer308 Just did it on Gordons reloading tool and got 2944fps with 60474 PSI pressure.
It also tells me that if you use 58.95 grains it will give you an accuracy node.
Cheers John, that is pretty spot on with my validation, also had great accuracy at 59grs too!
So ar2207 is the same as IMR4198?might be easier to get hold of.
H4198 is exactly the same as 2207 mate. IMR 4198 has a different burn rate.
Not any more ADI makes all three been verified by a couple of guys shooting all three powders in .44 mag revolvers at HMS matchesQuote:
Originally Posted by mawzer308
same load same bullet same velocity, It is an excellent powder for reduced loads and cast bullets.
My understanding was IMR powders are made by General Dynamics in Canada. Has this now changed?
Hodgdon owns the IMR label only.
I read somewhere that the General Dynamic plant in Canada for the IMR recipes would be unable to operate in the USA due to safety issues in producing that type of powder??
Interestingly it is a total cock in QL with different characteristics for all of the 3 powders. Not the only ADI/Hodgdon powder that QL does that with.
That's interesting since when? would that be the same for all IMR powders? I would air on the side of caution as there is likely to be lots of old style IMR still for sale and none of the reloading pams have been updated to suggest this?Quote:
Originally Posted by shooternz
Ive been playing with the Gordons reloading tool today, its quite neat, and free.
One question for the guru's...The calculated velocity is a bit different from measured. What variable/s should I tweak to get things to match?
Lots of red words and warning signs in my initial load setups, but it looks better once actual case capacity etc are entered.
check bullet length is actually as measured then adjust the "initial pressure"
@johnd I have just started using Gordon’s reloading tool, and you say for this example if he used 58.95grains he would have a accuracy node, what data on Gordon’s reloading tool says that it is a accuracy node?
There is a lot of info on Gordon’s reloading tool so just trying to get my head around all the info in it.
Cheers
Greetings All,
I have read through this thread with a bit of amusement and have a suggestion. Perhaps it would just be easier to load 38 grains of AR2206H behind the selected projectile and fire it over a chronograph. This will give the actual velocity in your rifle with your lot of powder and your projectiles. I used that load behind the 150 grain projectile and chronographed 2,380 fps in a 22 inch barrel, a nice soft target load. My rifle has a longish throat. With the lighter projectile and shorter barrel that would work out to about 2,350 fps. Hodgdon also published a load of 38 grains of H4895 (AR2206H) behind a 125 grain projectile for 2,592 fps in a 24 inch barrel. This works back to about 2,400 fps in a 16 inch barrel. The predictions of around 2,200 fps looks light to me. My load burnt a bit dirty but was nicely accurate. Cases could be neck sized forever just needing annealing from time to time.
Regards Grandpamac.
@Blair look along the top row, there is a feature called OBT which stands for Optimal Barrel Time.
In THEORY this gives accuracy nodes based on the harmonics of the barrel length.
Dont know how true it is, but is as good a place to start as any.