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  #1  
Old 05-30-2019, 11:51 PM
GLWenzl GLWenzl is offline
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Default Shooting larger diameter bullets than standard bore size.

FWIW I have been shooting bullets up to .004Ē larger than they should be. Some with good accuracy and some not so much. I expected much more pressure spike than Iíve experienced.

I know in some case such a soft lead or even plated bullets theyíll run a little over than what they should be... but find it odd that some shoot very well this way. Anyone else have experience with this? The ones Iím using are like jacketed soft sp.

Iíve never read where many have done this and I suspect some have done so without even knowing it?
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Old 05-31-2019, 01:05 AM
dungheap dungheap is offline
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Could it be you're playing with fire a little doing that? A change of primer, change of powder, or change of powder charge could make a huge dangerous problem out of a nothingburger. I could see one or two thousandths, but...
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Old 05-31-2019, 02:42 AM
tdoyka tdoyka is offline
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i use cast boolits that are .002 - .003" over the dia. of the barrel. i have used a 7.5 french(.307") in a jacketed bullet using a 150gr hornady sp(.308"). the 30-40 krag has a bore dia that goes .308 - .314". fortunately ,mine is .3085" and i use 165gr ranch dog(.311").

http://www.lasc.us/FryxellCBAlloyObturation.htm
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Old 05-31-2019, 03:38 AM
squirrel_slayer squirrel_slayer is offline
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I can't seem to find any info on it but I do remember reading about swage bore (or something to that extent) rifles that had special chambers and would intentionally swage down to a signficantly smaller bore.

One thought would be a .204-19 caliber .198. have a 19 caliber barrel chambered with a 20 caliber reamer but with a little extra help in the throating to help the process. Pressure would definitely be a byproduct however, but to what extent?

but one has to ask....why?

ETA: found it "squeeze bore"

hmm reading about it brings up an interesting concept. the "little john" adapter at the end of the muzzle to swage down the projectile by ~25% but being later in the pressure cycle of the round it increased barrel life vs a traditional squeeze bore and also increased muzzle velocity and sectional density thus flying flatter and penetrating better.

I wonder if one were to thread a muzzle adapter that had gradual taper from say 22-20 or 20-17 would react? one could even use this last section with a fast twist to help spin up the now long and heavy for caliber bullet. hmm....

Last edited by squirrel_slayer; 05-31-2019 at 03:48 AM.
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Old 05-31-2019, 03:46 AM
Oso Polaris Oso Polaris is offline
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I have seen this with cast lead bullets. Not uncommon because of malleability of lead. Don't try with thick jacketed bullet or solid core bullet.

Tongue in Cheek: A buddy was kind enough to shoot a .30cal bullet through my 5.56... It was a tight fit, but it cleared the barrel. It was deadly accurate. One shot -> $1,300 replacement upper.

I can't say enough about the construction of Daniel Defense "sporting" rifles! Lower was completely intact and functional sound.

Last edited by Oso Polaris; 05-31-2019 at 03:49 AM.
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Old 05-31-2019, 03:50 AM
georgeld georgeld is offline
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Hardness of the core makes all the difference.

Awhile back I tried to resize I think it was 375's down to .358 and
stuck 'em in the sizer die til they were hard to hammer out. I couldn't
push them out even with the 2' handle on my big old Lyman 1950's turret.
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Old 05-31-2019, 04:01 AM
squirrel_slayer squirrel_slayer is offline
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Quote:
Originally Posted by Oso Polaris View Post
Tongue in Cheek: A buddy was kind enough to shoot a .30cal bullet through my 5.56... It was a tight fit, but it cleared the barrel. It was deadly accurate. One shot -> $1,300 replacement upper.
This is exactly why I sold my 300 blk and everything related to it. Murphy is an A-hole.
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Old 05-31-2019, 08:19 AM
moorepower moorepower is offline
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Many a .311 7.62X39 shot down a .308 bore.
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Old 05-31-2019, 08:26 AM
Oso Polaris Oso Polaris is offline
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Quote:
Originally Posted by squirrel_slayer View Post
This is exactly why I sold my 300 blk and everything related to it. Murphy is an A-hole.
Yeah... Newbies can/will teach you hard lessons. I changed my protocols with guest shooters, and made some modifications to my equipment
1. Custom Dust Covers for each rifle that states the caliber on both inside and outside of dust cover so that always is showing.
2. Dedicated magazines for each caliber with bold markings of ammo on exterior of magazine
3. Ammo is never commingled ... each caliber is stored in separate ammo can
4. Never have the 300BO and 5.56 out at same time (rifles and ammo)
5. I load all magazines to ensure that a random round doesn't get loaded by inexperienced shooter.... this is how my rifle got detonated.
6. Load up enough magazines that no need to reload a magazine while at range

When it is just me (no guests) I don't have the same safety issues. However, I have found easier to keep track of gear if I only have one caliber of rifle unsheathed at a time.

Last edited by Oso Polaris; 05-31-2019 at 08:34 AM.
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  #10  
Old 05-31-2019, 01:42 PM
squirrel_slayer squirrel_slayer is offline
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Quote:
Originally Posted by Oso Polaris View Post
Yeah... Newbies can/will teach you hard lessons. I changed my protocols with guest shooters, and made some modifications to my equipment
1. Custom Dust Covers for each rifle that states the caliber on both inside and outside of dust cover so that always is showing.
2. Dedicated magazines for each caliber with bold markings of ammo on exterior of magazine
3. Ammo is never commingled ... each caliber is stored in separate ammo can
4. Never have the 300BO and 5.56 out at same time (rifles and ammo)
5. I load all magazines to ensure that a random round doesn't get loaded by inexperienced shooter.... this is how my rifle got detonated.
6. Load up enough magazines that no need to reload a magazine while at range

When it is just me (no guests) I don't have the same safety issues. However, I have found easier to keep track of gear if I only have one caliber of rifle unsheathed at a time.
No doubt a good system....however there is still the Murphy element no matter how safe you are. I contemplated doing the same (FDE mags/furniture for 300 black for 5.56, ect...)

But! I have young children I'm introducing into the shooting sports and it's a risk I'm not willing to take. It's one thing if it blew up on me but I could never forgive myself if it happened to one of my children.

But it gives me an excuse to 1up the 300 and make a new wildcat. Still need to get/make a reamer to try it out.

My 35 Mamba based off the 22 nosler case (or any 6.8spc based variant) body dimensions are that of a 357 herrett- .100" and -.050" neck length made a "cherry" to cut my own casting mold which drops at 354gr naked. a modern take on a 9x39 which hopefully will be AR friendly.

I considered a 458 socom but I don't have a 45 cal suppressor
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