projectile seating |
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allan
Senior Member Joined: March 11 2006 Location: Dapto-Australia Status: Offline Points: 1924 |
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Posted: July 26 2007 at 4:50pm |
ok guys i have a question for yas.
time permitted,last couple of nights ive been tinkering with reloading, and ive hit a grey area with the seating process(using the Lee classic loader-you know "tap- tap")
ive measured numerous mil rounds, and factory ammo and being different projectiles they all differ in overall length. the mil measures 77mm, the factory 75mm and my roll ya owns a mickey hair over 76mm.
my rollys seem to cycle through the rifle nice(without firing)as do all the other bullets ive compared to. I have a mickey hair of the grooves of the hornady projectiles showing from the case mouth.
anyone have ideas on correct seating for non press reloading?
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'SAVIOUR OF OUR SKIES BOYO!'
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Tony
Moderator Group Moderator Joined: April 18 2006 Location: United Kingdom Status: Offline Points: 3256 |
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Allan what weight bullets are you using? the info I have here says 150 grain head col 70.5 174 col 78 and 180 grain 78 col sounds like you're in the ball park with the col. the rim on the heads is for crimping the cases so I wouldn't worry to much about it showing mate. Unless you want to crimp em too.
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Rottie (PitBulls dad.)
“If electricity comes from electrons, does morality come from morons Born free taxed to death!!! |
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Hatchetman
Senior Member Joined: September 06 2006 Location: Fernie, BC, CA Status: Offline Points: 1284 |
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Well aunty nick harveys reloading manual......... only gives me a max case length
How ever it mentions that max cartridge length is only dictated by the magazine length and how deep the rifling is. Now my hornady reloading bible says that with their 150 grain SP pills the max COL is 2.935" so fire up your imperial to metric calculator to work out those backwards seppo units of measurement. |
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And the snow will cover tracks, And I'll be watching, Because I'm hunting you - Sarah Blasko, The Gardens End |
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allan
Senior Member Joined: March 11 2006 Location: Dapto-Australia Status: Offline Points: 1924 |
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Dang! ok guys, im using the 150grn Hornady Soft Points, goin off your book there Hatchet its works out to be 74.5490mm.looks like i should go deeper a mm or so. Tony thats a big difference in length for the 150 grn, is that Hornadys data ? does it change with different powders? as it does with projectile weights
Reload they say!!! man ive opened up a can of worms here.
if all goes well as long as it goes bang and comes out the right end of the rifle ill be glad,if all goes wrong Dave mate ill haunt you till the end of your days
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'SAVIOUR OF OUR SKIES BOYO!'
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hoadie
Moderator Group Joined: March 16 2006 Location: Niagara/Canada Status: Offline Points: 9003 |
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CAN OF WORMS?! Theres no WORMS in re-loading!! AL! R U stuffing bullets, or U going fishin?! Trust me - you shouldn't be puttin worms in there!! LOL!!
Hoadie |
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Loose wimmen tightened here
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Cookie Monster
Special Member Joined: January 22 2006 Location: United States Status: Offline Points: 7510 |
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Seating...........the most accurate way is where the bullet is just touching the lands. This reduces bullet jump and ensures the bullet is aligned and starts down the barrel the same every time.
CM
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allan
Senior Member Joined: March 11 2006 Location: Dapto-Australia Status: Offline Points: 1924 |
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Hoad ya dink!
I have a few data sources but they too give different measurements in oal.spose pick a medium, fire and see.
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'SAVIOUR OF OUR SKIES BOYO!'
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White Rhino
Special Member Donating Member Joined: May 05 2006 Location: United States Status: Offline Points: 5118 |
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Allen you can tie it to a saw horse and tie a string to the trigger and get way back, Kinda the way I tried out my Turkish Mausers before I bought some head space gauges.
I had a .30 Carbine blow up in my face once due to bad recipe/not following directions properly. or substituiting powders? ......
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"White Rhino"
"Everybody's got to believe in something. I believe I'll have another beer." --W. C. Fields |
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Tony
Moderator Group Moderator Joined: April 18 2006 Location: United Kingdom Status: Offline Points: 3256 |
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Allan the data I gave you is from the current Vihtavuori loading manual. Hatchet 2.935 is equal to 74.56mm which seems a bit short to me. The info on the Lee die set says case length 2.222 inches or 56.44mm and a col of 3.075 inches or 78.11mm. That compares favourably with the Vit data I have for col.The Lyman data I have shows the same case length as the lee data and the same col 78.11
As cookie says you need to seat the bullet as close to the lands as is practical to give the accuracy.
Now I'm going out on a limb here the deeper you seat the bullet into the case the closer you get to a compression load. Some loads are compression loads which are mainly a moderately slow burning powder load. But I would be wary if you're using a medium to fast burn powder as the pressures they develope when being over compressed may be too great for the rifle. This can cause headspace problems and cases will show signs of incipient case separation. So for what its worth mate I'd stick to the Lee Lyman col of 78.11mm it should give you good results without any problems.
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Rottie (PitBulls dad.)
“If electricity comes from electrons, does morality come from morons Born free taxed to death!!! |
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allan
Senior Member Joined: March 11 2006 Location: Dapto-Australia Status: Offline Points: 1924 |
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I just got off Ebay, theres no bomb defuser suit on there so looks like ill have to try the string tied to the trigger trick ive got the recipe spot on its just overall length that had me scratching my head.going in the middle of mil and factory loads was a starting point and i spose i can adjust increments of thous at at time to get accuracy. i found Hornady makes a tool for marking the start of your rifling thus giving spot on length for your rifle, anyone used these before?
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'SAVIOUR OF OUR SKIES BOYO!'
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allan
Senior Member Joined: March 11 2006 Location: Dapto-Australia Status: Offline Points: 1924 |
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thanks Tony. yes i can now see bein short would not be the way to go, with pressures and all..now if it was too long i gather it would be hard to close the bolt home.
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'SAVIOUR OF OUR SKIES BOYO!'
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Hatchetman
Senior Member Joined: September 06 2006 Location: Fernie, BC, CA Status: Offline Points: 1284 |
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Yeah the things cant be too long, if your round is too long and you jam the bullet into the rifling when loading it, upon firing it may cause excessive pressure!
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But the winters coming,
And the snow will cover tracks, And I'll be watching, Because I'm hunting you - Sarah Blasko, The Gardens End |
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Tony
Moderator Group Moderator Joined: April 18 2006 Location: United Kingdom Status: Offline Points: 3256 |
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If they are too long you'll have difficulty closing the bolt properly and there's a chance you'd end up with a live round jammed up the spout half in half out the chamber. You can get guages to measure the chamber length if you're really keen. Last 1 I priced up was around £100 uk . A cheap and cheerful way is to use and empty case with no primer in it and a bullet which is reasonably tight in the neck but can be moved in or out with moderate pressure. Slip the round into the chamber slide a brass rod through the primer hole and GENTLY tap the bullet head forward until you feel it just touch the lands. Extract the round measure the col and then knock 3 or4 of thou off. That should give you an fair indication of the chamber length but its nowhere near as accurate as a guage.
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Rottie (PitBulls dad.)
“If electricity comes from electrons, does morality come from morons Born free taxed to death!!! |
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AL,AL,AL!!!!!! (shakes his head sadly ) My son you have indeed wandered in to the land of Alchemy ! Rule one never ,ask about seating depths to fellow readers! It causes the Tryo to break out in Boils & in extreme cases Rickets !Question like this causes readers to scramble for their reloading manuals & notes ,sit in rooms lit with low voltage globes & mutter strange incantations ! I'll add to the confusion ......Seat your bullet so the Cannure grove is just sitting into the neck !
Dave PS the over all length for a Hornady 150 gn in a .303 is 2.995" or 76.08mm. |
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Smokey
Senior Member Joined: May 11 2007 Location: United States Status: Offline Points: 806 |
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Listen to DaveH.
Otherwise, adjust length to best suit your individual rifle.
1. It has to fit in the magazine, feed and chamber without jamming.
2. Just barely touching the rifling if it also satisfies 1.
Work up from a starting load. Back off some if you see signs of excess pressure.
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Cookie Monster
Special Member Joined: January 22 2006 Location: United States Status: Offline Points: 7510 |
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Well put there Smokey! when I shoot my AR-15 with 75 grain projectiles loaded to seat on the riflings I have to hand feed them one at a time since they will not fit into tha magazine. But looking for accuracy not a auto loader. CM
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