Starting another 30 BR project and would like to get some opinions on which reamer seems the most accurate and/or most popular. I have not found any recent posts discussing the reamer options, Schmidt vs Robinett. The 30 BR I now shoot used the Robinett reamer and although it is very accurate I wonder if I am getting enough neck tension. Using BIB 118(10) seated .003 into the lands the bullet seats only a short distance into the neck. Since 30BR's love neck tension would the longer case neck give more neck tension due to increased surface area holding the bullet and is there any benefit to accuracy? Any information would be appreciated.
30 BR Reamers
- Thread starter ldpace
- Start date
I was mistaken then. I thought the chamber was cut for a longer neck but the distance from the Bolt Face to the Bullet Ogive/Lands contact was the same, thus increasing the neck length only and not the powder capacity of the case after the bullet is seated. I guess your reamer is cutting a longer throat to allow for greater net capacity. Yes I would like a copy of your reamer print. Thanks for clearing that up.
Idpace, you need to get the whole story before making a decision. The reamer Dave is using is spec'd for use with "blown out" brass, as opposed to mandrel formed brass. There is an approximate .025 - .035" difference in the case OAL between the two methods. The "blow out" method is best used with an old barrel chambered for such, though some shooters are using their match barrels for forming with no apparent ill effects. Dave, correct me if I'm off base with my comments, but it appeared that there might be a misleading lack of detail in this thread so far.
BTW, I would recommend the "blow out" method for anyone planning to use 7 ogive bullets because of the extra seating depth required. Then, you can also use the 10 ogive bullets, too. That little extra case capacity can become very important with some barrels.
BTW, I would recommend the "blow out" method for anyone planning to use 7 ogive bullets because of the extra seating depth required. Then, you can also use the 10 ogive bullets, too. That little extra case capacity can become very important with some barrels.
Thanks for the comment, I am aware of the "blow out" method of forming the brass. I think that is what Jackie Schmidt did with his reamer a few years ago. There is some misunderstanding on my part as to where the additional net case capacity comes from after the bullet is seated, I am sure that will clear up as this thread proceeds. Thanks
Also, ZERO free-bore is just that - NONE - it cannot get any shorter! ;D
Dave pointed out an important consideration: to maximize 'grip' on the bullet shank, the case-neck length should 'match' the chamber-neck length. As Joe points out, originally, we were necking-up, using mandrels, which results in shorter necks than does the FF method. I'd like to have the time and $$$ it would take to produce enough data to prove even a 70% probability that 'A" is better than"B" - this is, "TASTES GREAT - LESS FILLING", stuff . . .
The head-space and case-body capacity are identical: only the neck-length,and, thus, the OAL change. The neck-length should be kept to about 0.010: short the the maximum length for your particular chamber - if not, you get, as Dave noted, "pseudo" free-bore - AND less grip on the bullet shank! :-*
The throat angle is another consideration: in effect, when land contact is desired, going to the "standard" 1.5 degree (3.0 Deg. included) angle LENGTHENS the [loaded-round] OAL requirement. The only real change is 0.035" of [case]neck/OAL - it doesn't amount to much in case capacity, nor, relative to the land/bullet relationship, does it affect the 'seating-depth'. The only 'real' gains via the FF method are relative ease of case-forming, and with the more blunt ogive bullet configurations, slightly less powder compression . . . oh, and maybe, for a finicky tube, that 0.035" longer neck, for a slight increase in case-capacity - perhaps 0.3 Gr. or so. BTW, relative to compressed powder: I have yet to observe a negative attribute.
Keep 'em ON the X! RG
Dave pointed out an important consideration: to maximize 'grip' on the bullet shank, the case-neck length should 'match' the chamber-neck length. As Joe points out, originally, we were necking-up, using mandrels, which results in shorter necks than does the FF method. I'd like to have the time and $$$ it would take to produce enough data to prove even a 70% probability that 'A" is better than"B" - this is, "TASTES GREAT - LESS FILLING", stuff . . .
The head-space and case-body capacity are identical: only the neck-length,and, thus, the OAL change. The neck-length should be kept to about 0.010: short the the maximum length for your particular chamber - if not, you get, as Dave noted, "pseudo" free-bore - AND less grip on the bullet shank! :-*
The throat angle is another consideration: in effect, when land contact is desired, going to the "standard" 1.5 degree (3.0 Deg. included) angle LENGTHENS the [loaded-round] OAL requirement. The only real change is 0.035" of [case]neck/OAL - it doesn't amount to much in case capacity, nor, relative to the land/bullet relationship, does it affect the 'seating-depth'. The only 'real' gains via the FF method are relative ease of case-forming, and with the more blunt ogive bullet configurations, slightly less powder compression . . . oh, and maybe, for a finicky tube, that 0.035" longer neck, for a slight increase in case-capacity - perhaps 0.3 Gr. or so. BTW, relative to compressed powder: I have yet to observe a negative attribute.
Keep 'em ON the X! RG
Randy, glad to see you here, this is Frank I been talking to you about my new 30BR being done by Bruno, I don't think we discussed fire forming yet, since Bruno uses your reamer, correct me if I am wrong, once I use a mandrel to go from 6mm to 30 and turn necks I can then load and just blow them out as I normally do on other calibers, and what bullet can I use until I get yours.
Frank
Frank
Thanks for the informative responses. I now understand the true meaning of Zero Freebore. I must admit some of the terminology had me a bit "cornfused". I downloaded a few reamer prints to be sure I understood the concept. I have about one hundred pieces of 30 BR brass expanded on a mandrel that I have been using in a 30BR built on a Savage action, Robinett reamer. Randy is a wealth of knowledge and very kind to new shooters, Thanks Randy. Now that I am trying to build the best gun I can on a BAT 3L I will have to decide whether it is worth the trouble to set up an old 6BR barrel to blow out some new brass. Unfortunately I do not have an old 6 BR barrel. If I can find one I think I would like to make the switch to blowing out the brass and using a long neck reamer. Thanks
Idpace,
That Savage action you had on 30BR was it a target action and what barrel were you useing, was the action trued or blue printed? reason I ask is I am doing a target action and Krieger barrel, and how did it shoot? I am thinking not as good as you wanted or you wouldnt be building on with a Bat action, correct?
Frank
That Savage action you had on 30BR was it a target action and what barrel were you useing, was the action trued or blue printed? reason I ask is I am doing a target action and Krieger barrel, and how did it shoot? I am thinking not as good as you wanted or you wouldnt be building on with a Bat action, correct?
Frank
I use an old 30 cal barrel I got from Gary Long. I had Kiff make me a reamer with a l-o-o-o-ng neck; chamber OAL is 1.580 because I didn't want any possibility of the neck of the case running out of room to expand. When I tried this the 1st time a few years ago in my 30BR chamber cut with the original 30BR JGS reamer, which makes a chamber of about 1.535 - 1.540 depending on your headspace preference, it resulted in the neck being pushed up into the lead giving a nasty little "crimped" case mouth which didn't want to be ironed out easily. I just fill the case with Bullseye & seat a 1/4" plastic ball in it. The plastic balls come from McMaster-Carr, and are a little pricey, but make a quick, neat fireform round. I have included a pic of a loaded round, ready to fireform. Henry Rivers is also doing this now, and he is using about 9 grains of Unique & COW with paper wad. I like my method better because of that 10 foot flame when I fire one off 
Attachments
Frank, I really can't tell you how accurate the Savage 30 BR is. I am a true amateur at Bench Rest shooting. No expert has shot the rifle. It is the savage target action that came from a Savage F/TR 308 rifle. The barrel is a Douglas that I purchased from Fred at Sharp Shooters Supplies. It is bedded in one of Fred's Dog Tracker stocks. The action is stock, I have not had it timed and trued. I have shot a few sub .200 groups with it but only three shot groups and I can't do it consistently. I am building the new gun just because I want to. Your Savage project probably has the potential to be very accurate. I never know if my larger groups are due to the gun, the reloads or as is most probably the case, the guy pulling the trigger. Good Luck.
My apologies in advance if this is a little off topic, but has anyone used the 30BR loaded with 200-220 gr. bullets for sub-sonic work? I have a Rem. 700 donor action and am looking for the H2o capacity of a 30 BR as compared to the .223, parent cartridge of the 300 Whisper and other similar cartridges, as well as an approximate freebore length. Any help for you 30 BR guys would be greatly appreciated.
Thanks,
Lloyd
Thanks,
Lloyd
halfmoanut
Silver $$ Contributor
Dave Berg, I would like a print of your reamer you offered.I am in the process of building a 30 br and your ideas seem substancial. Pm me for personal e-mail. Thank You Kindly!!
P1ZombieKiller
Silver $$ Contributor
1shot,
I can send you some BR cases if you want. I have a few I was turning and messed them up. You can have them. if you want them, PM me your address, and I will send them to you. I too shoot a 300 whisper, and I was thinking of doing the BR subsonic too, but I want to go with he 338 instead of the 300. A 1050 fps 308 is a 1050 fps 308 no matter what case it comes out of. A 1050 fps 338 is a beast all on it's own.
Joe and Dave,
As always, you guys teach me more and more all the time. THANKS!!!!
I can send you some BR cases if you want. I have a few I was turning and messed them up. You can have them. if you want them, PM me your address, and I will send them to you. I too shoot a 300 whisper, and I was thinking of doing the BR subsonic too, but I want to go with he 338 instead of the 300. A 1050 fps 308 is a 1050 fps 308 no matter what case it comes out of. A 1050 fps 338 is a beast all on it's own.
Joe and Dave,
As always, you guys teach me more and more all the time. THANKS!!!!
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