Reloading tolerances. |
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philtno
Senior Member Joined: May 04 2019 Location: Blenheim, NZ Status: Offline Points: 261 |
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I guess it's like any other sport....the more regularly you practice the better you get....this being said, that quite a blessing for those who have the time to go every week as - just taking your example of 100-200 rounds a week - that also represents some decent money, at least for us here, in NZ. Every 303 round you reload costs you a minimum (really nothing lower than that) of NZ$1 - NZ$1.2...(NZ$ is no far from the US$) at the end of the month, that's a lot of bread taken from the table as my grand father used to say Just by curiosity, what's the average cost per round where you guys live??
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philtno
Senior Member Joined: May 04 2019 Location: Blenheim, NZ Status: Offline Points: 261 |
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Britrifles, Can you please explain that "angle of departure" thing???or redirect me to the litterature that explains it? Thanks
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britrifles
Senior Member Joined: February 03 2018 Location: Atlanta, GA Status: Offline Points: 6539 |
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Philtno,
I don’t like to think how much money I’ve put into lead going down into the berm! Here in the US, it costs me about 50 cents a round to reload. I often say I wish I would have started this sport when I was much younger, but I could not have afforded it then. The angle of departure refers to the angle the bullet leaves the muzzle and is influenced by barrel vibrations. Maj EGB Reynolds describes this in his book on page 137-140. He also refers to this as the “Angle of jump is the angle made by the line of departure of the bullet and the axis of the rifle before firing.” The angle of jump in minutes was calculated by measuring the mean point of impact of groups of three shots fired at 71 feet 4 inches for a series of charge weights ranging from 33 grains to 38 grains. The tests showed that the faster bullets left the muzzle at a lower line of departure impacting lower on the target. |
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Shamu
Admin Group Logo Designer / Donating Member Joined: April 25 2007 Location: MD, USA. Status: Offline Points: 17603 |
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Yes the idea is to have the bullet exit the barrel at the end of its oscillation when firing because it that tiny moment the barrel is stationary, not whipping up or down.
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Don't shoot till you see the whites of their thighs. (Unofficial motto of the Royal Air Force)
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Zed
Special Member Donating Member Joined: May 01 2012 Location: France Status: Offline Points: 5585 |
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I'll be trying out some Norma 202 powder soon.
What are your recommendations for .303 in a No4 mk1 rifle and in a No1MkIII*? To be honest, I'm getting some encouraging results with the Vihtavouri 140 powder; but it's not stocked at either of the places I normally go; so not practical in the long term. The cases will be PPU with Federal primers and 174 gr SMK's and possibly 174 gr PPU bullets. I also want to try the Norma 202 in the 7.62 NATO loads for the L39. I use Lapua .308 cases and will have both 147 grain GGG bullets and also SMK Palma 155 grain bullets to try out.
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It's nice to be important, but it's more important to be nice!
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Goosic
Senior Member Joined: September 12 2017 Location: Phoenix Arizona Status: Offline Points: 8792 |
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I use 40gr of the Norma 202 for the .312 174grn BTHP. The recommended min is 39.0gr and the max if 41.0gr.
The recommended min of 42.0gr and a max of 43.5gr when using a 155grn bullet in the 7.62x51mm. I was using 40.0grns with the .308 168grn SMK but I have bumped it up to 41.7grns . If you go with that bullet,the min is 40.0gr and a max of 42.4gr |
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philtno
Senior Member Joined: May 04 2019 Location: Blenheim, NZ Status: Offline Points: 261 |
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Thanks for that, Britrifles I found the pages where it talks about that....will read it more attentively Cheers
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Honkytonk
Senior Member Joined: December 30 2017 Location: Brandon Mb Status: Offline Points: 4770 |
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I admire the commitment and knowledge of shooters that are capable of some impressive precision with Lee Enfields on this forum! I consider members of this forum kind of mentors, as I've learned so much. Probably the best advise I ever received on this forum was the "minute of hand" rule. If my stock Lee Enfields with decent handloads can shoot a group that can be covered by the palm of my hand, I've got what that stock rifle was designed to shoot. This is how I judge every trip to the range now, and I've rarely come home disappointed. It took a lot of pressure (self inflicted) off me and let me learn to be a more relaxed shooter. The best, most precise loaded ammunition can not reach it's full potential without practice, practice and practice. It is just one component to the equation. Ammunition, rifle, person behind the trigger...
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A square 10
Special Member Donating Member Joined: December 12 2006 Location: MN , USA Status: Offline Points: 14452 |
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and most often that last part of the equation gets ignored blaming all the other components - all my rifles shoot better than i am capable of shooting them anymore , i do not use a sled , i shoot offhand or bench supported but its always the guy handling the trigger to blame
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britrifles
Senior Member Joined: February 03 2018 Location: Atlanta, GA Status: Offline Points: 6539 |
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Zed, the Norma website gives a velocity of 2454 fps with the minimum charge of 39.0 gr for the 174 gr Hornady RN bullet. I’d suspect the 174 gr SMK with this load to be about 30 to 40 fps faster (less bearing surface contact with the lands). I typically load the SMK to 2400 fps.
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Shamu
Admin Group Logo Designer / Donating Member Joined: April 25 2007 Location: MD, USA. Status: Offline Points: 17603 |
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The most important link in the firing chain is "The big nut behind the trigger"!
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Don't shoot till you see the whites of their thighs. (Unofficial motto of the Royal Air Force)
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Zed
Special Member Donating Member Joined: May 01 2012 Location: France Status: Offline Points: 5585 |
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Thanks for the loading data. I picked up the Norma 202 on Saturday and also some 147 gr 7.62 NATO type ogives from GGG.
I'll check out their website for the 147 gr 7.62. Sounds like 39 grains is a good place to start with the 174 SMK for the No1MkIII and work up to 40 grains for the No4's. (The No1MkIII* tends to prefer a lower charge than the No4's).
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It's nice to be important, but it's more important to be nice!
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Goosic
Senior Member Joined: September 12 2017 Location: Phoenix Arizona Status: Offline Points: 8792 |
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I.am reworking some load data for the 200grn .3105" FMJ rebated BT Lapua D-166 bullets I am going to retest this Wednesday. Powder will be the IMR3031 this time...
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