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Post by pbcrisp on Jul 1, 2018 9:05:40 GMT -8
American 30 uses 6.8SPC as the parent case.
Can you use 22-Nosler brass instead...and use a 5.56 bolt vs a 6.8SPC bolt. I am looking to build 2x hog hunting AR's using this cartridge. 6.8SPC brass is reasonably plentiful...so that is a benefit of going that route. 22 Nosler brass is less common, and might not be a long term solution (thanks to 224V). Still, if I have 5.56/223 BCGs...and a bead on cheap 22-Nosler brass - could I do it?
Thanks. -PB
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Post by pbcrisp on Jul 1, 2018 9:27:50 GMT -8
22 Nosler brass looks to be longer than 6.8 SPC and 30 HRT...so, should be usable?
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Post by GLSHOOTER on Jul 2, 2018 6:17:00 GMT -8
Doable but you give up case capacity and neuter the round. 6.8 brass is much more available than 22 NOS or VALK. The new Starline is excellent for the A30.
Greg
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Post by pbcrisp on Sept 8, 2018 15:23:49 GMT -8
Barrels are ordered. I got the last 2 on Truesportinarms. 8.5 twist.
Noticing on some other posts that there is some variation in the chambering. Depending on date of manufacture, one might get the 'old' chamber or the 'newer' one? Is this right? I would be a bit surprised to find the 2 barrels could actually have different enough chambers that they cant use the same ammo?
Brass to use: 1) 22 Nosler brass? Greg, you say 'no' due to case capacity? I thought the interior volume would be very similar...just the case head is different. Folks on the Nosler forum were having trouble with case rim damage on the early 22 Nosler brass...but otherwise no issues that I know of.
2) 6.8 SPC brass? Depending on the chambering (see possible variance noted above) regular 6.8 brass might not be the best option?
3) Starline basic brass? highest price, but best option...why?
Load data: I am reading lots of stuff on the 30 HRT, 30 Herrett, A30, x39, etc. SWBO powder seems popular used by BigBore on MDWS forums.
These barrels will be made into hog hunting rifles to be used in Georgia. Distances out to 200-yds. Most shots will be 100 or less. Go with lighter bullets? 125 SST? or heavier...150-grain SST? If I can get 2400 fps out of a 16" barrel with a 150 SST, that would be REAL nice. still, at 200-yds, it might be dropping below optimal velocity for decent expansion. Thoughts on bullet choice?
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Post by GLSHOOTER on Sept 8, 2018 15:51:21 GMT -8
The case is too small to start with to give up the case capacity to 22 Nosler brass plus it is softer than most out there. That tall rebated rim head is going to cost you. It must give up space when you move that cylinder up taller. We were bending the crap out of the brass but that has decreased somewhat but some guys still have occasional issue. I suspect the brass mixture is changing from lot to lot and they did admit they changed it after the first batch. Also you will have to trim 2 MM more off case if you use the Nosler stuff.
6.8 brass is by far the easiest. You could go the 6.8 BASIC but it will require annealing and then trimming. Guys have been having decent luck setting their shoulders at various heights with it to get around the screwy chambers.
Trust me if you get one chamber vs. the other extreme you cannot use the same ammo in both. One won’t fit in the other as the shoulders will be too tall on the one hand and on the other the cases will be so far forward you will be setting off a rocket in the chamber because it is not tight in the chamber area and you will be seeing terrible case deformation IF it even goes off at all.
If you get a TALL one and use 6.8 standard brass you will have to fire form. This cartridge was designed specifically to NOT fire form but it was changed for whatever reason.
Loading is easy start with 7.62 X39 and start moving up as it has more capacity and operates at a higher pressure than the 7.62X39. RL10 works well. I’ve never tried the SWBO stuff. You can barely get 2400 out of a 150 in a 20” and be easy on the gear. It won’t happen in a 16” tube. Smart man will shoot the 125 Nolser and never look back. They work on mule deer to 300+ yards so a hog will be a snap. I have had no reports on the SST and how it does but it should certainly be a viable choice.
Greg
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Post by pbcrisp on Sept 18, 2018 17:43:09 GMT -8
Barrels get here tomorrow. Greg, I think almost every BHW barrel owner is appreciative of all the help you give here on the forums - I know I am.
Brass choices: 6.8 Once-Fired or New. 6.8 Basic Starline. 6mm Hagar brass? 22-Nosler brass.
Is there any difference in case capacity H2O in final formed brass between all these options? With a powder starved cartridge like A30, every half a grain of powder helps.
Is there any value in running numbers in Quickload for 30-Herrett using 37.5 H2O capacity and higher max pressure? There is lots of forum chatter for 30HRT folks using ARP barrels. How usable is that load data?
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Post by GLSHOOTER on Sept 18, 2018 18:04:58 GMT -8
Barrels get here tomorrow. Greg, I think almost every BHW barrel owner is appreciative of all the help you give here on the forums - I know I am. Brass choices: 6.8 Once-Fired or New. 6.8 Basic Starline. 6mm Hagar brass? 22-Nosler brass. Is there any difference in case capacity H2O in final formed brass between all these options? With a powder starved cartridge like A30, every half a grain of powder helps. Is there any value in running numbers in Quickload for 30-Herrett using 37.5 H2O capacity and higher max pressure? There is lots of forum chatter for 30HRT folks using ARP barrels. How usable is that load data? Just use 6.8 brass. Nothing's to be gained with the others. Hagar will be smaller and Nosler won't take the pressure. You could do QL but the capacity is wrong. I don't have access to my numbers at this point so can't give soecefics. I would be extremely cautious with anything from that source. Cowboys loading it with smaller capacity getting ungodly numbers that look like disaster when run through QL. We did extensive actual pressure testing and load development coordinated among three of us. It wasn't there hodge podge of just throwing things together with god knows what variation by unknown skilled leaders and shooters. . Give me a week and I'll get you set up. Greg
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