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Ballistics on a Spinning Planet - Video

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This video discusses the apparent drift of a rifle trajectory due to the rotation of the earth. A physical explanation is given, then examples, and finally a demonstration of how to calculate corrections to account for the earths rotation.

0:00 Introduction
0:36 Pseudo Forces
2:05 Coriolis Effect
3:41 Eötvös Effect
5:12 Static Examples
6:08 Dynamic Animations
10:47 Applied Ballistics Quantum Application
13:23 Conclusion

Accessories 230 A-tips, 180 hybrids, and 6 GT brass

Selling some extras to make room on my reloading bench. Only trade interests are,
-109 hybrids
-110 atips
-.30 230 and 245 hybrids


-3 boxes (300ct) Hornady 230gr A-Tips. 2 are the same lot. Asking $200 shipped

-2 boxes (200ct) Berger 7mm 180 hybrids, same lot. Asking $120 shipped

-310 pieces of GAP 6mm GT brass. 75-80% is 2x fired, the rest is 3x fired. Has been dry tumbled, annealed, resized/deprimed, and then wet tumbled. Asking $180 shipped

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SOLD Polish Mosin Nagant carbine

Polish Mosin Nagant carbine with sling and internal magazine

Fewer than 50 shot fired

$300 shipped to your FFL
PayPal only

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SOLD RARE USO US Optics MST-100 10x Tactical USMC Scout Sniper Rifle Scope

SOLD

Looking to sell a used RARE USO US Optics MST-100 10x Tactical USMC Scout Sniper Rifle Scope in excellent condition.
Purchased in March this year and never used it! Perfect for your M40A1 or M40A3 build!
  • Marine Mil-Dot Reticle
  • Fixed 10X
  • Non-illuminated
  • 1" Diameter Main tube
Please see pics as they are part of the description.

Comes in hard plastic carrying case w/ adjustment tool and flip-up covers.

Asking $4100 shipped (insurance is extra)! NO trades! Thx

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МЦ-55 Zenit rifle by Yevgeny Dragunov

Not a sniper rifle, but definitely vintage ( late 50s ) for Olympic competition 300m – I’m looking for information about this weapon.

I came across an advertisement of sale of such a rifle and started to browse the internet. Unfortunately, there is very little information about it. It was developed in 1955 by a team with the participation of Yevgeny Dragunov ( later the creator of the SVD rifle ).

Only 10 “Zenit” rifles were supposed to be produced for the leading sports shooters of the USSR, in the first period of manufacture ( 1956 – 1961 ).
Based on experience from use in the years 1963-73, 110 rifles were produced, but already in the improved version "Zenit-3".

The rifle that is advertised for sale does not have an original stock butt plate, a diopter sight and original Soviet documents are missing and it also has a modern Picatinny rail mounted on the receiver. It looks like it has only flaws.

So why did I get interested in it? Because it has the name "Zenit" engraved on the receiver - without an additional number and the year of production 1957. It would seem that this is a rifle from the first series of only 10 produced. But it also has serial number No. 66 and the theory that it is one of those first ten can unfortunately be questioned. There is a problem with the Soviet numbering system of sports weapons. I already have a Typhoon-3 rifle, of which only 130 were supposed to be produced and mine has serial number M247 and I have also seen a rifle with the number P1321.

So this Zenit with the number "66" may be one of the first 10 rifles produced in this version and the numbering does not reflect the scale of production but there is no evidence for this.

That's why I'm asking if anyone on the forum knows anything more about Zenit rifles?

Zenit - 1957 - No 66.jpg

Sizing 6mm creed to 6.5 creedmoor

Question to everyone.

Is there anything I need to watch for sizing a 6mm creedmoor case up to 6.5 creedmoor? I annealed it, resized it/ trim/deburr and chamfer. The shoulder is at the same place as my hornady 6.5 brass now, no bumps or bulges on the case, and the neck thickness is the same as well as diameter.

I’ve seen on other forums this works I just wanted so see the consensus before I waste a primer and powder loading a round.

Gas Gun Pressure and Brass Question

Just got a JP LRI-20 in 6.5 Creedmoor. I’m used to reloading pressure signs for my bolt guns, but it’s the first gas gun I’m going to reload for. I Put about 200 rounds of factory Hornady ELDM 140gr through it and most of them came out with ejector marks.

1) I wouldn’t run my bolt guns with this load if I saw this. Would you say this means it’s over pressure and should I stop if I see this when I start to reload…or are gas guns harder on brass than bolt guns?

2) can I use the cases with the deflector marks and damage on the neck? They pretty much all have it and look like this. I have another 300 rounds I was hoping to use the brass on once fired.

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Firearms 2 gun trade or sell: 6 dasher and 6.5 creed (trade for AI)

Looking to trade 2 very nice custom bolt guns for an AI (ATX, ATX-C, etc)

First up:
Terminus Zeus QC
TT diamond
Proof 26” 6 dasher 1:8 (have load for it 5.5SD with .5” groups)
KRG whiskey 3 folder with enclosed foreend and full length arca and wiebad cheek pad

This gun shoots extremely well. About 250 rounds down it.

If sold I will sell the base gun for $4200 obo

Second up:
Bat machine TR action #002
TT diamond
18.5” 6.5 creed barrel built by short action customs
Currently sitting in a Grayboe renegade stock but is getting trading for an MDT ACC this week so it will be sitting in that soon instead.
If selling gun itself with ACC chassis: $3750

Depending on AI and package it can be both base guns for the AI, or the 6.5 with the Steiner included for it. We can work something out if someone is interested. Will sell separately as well
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.308 how accurate?

So i was happily loading some .308 with a balance scale and i started thinking. How accurate is accurate???
I got out a cheap digital scale. I weighed the same load 10 times to be sure the scale would give me the same result every time. It did. I went through 75 case to find 10 within .2 grn of each other. Then the same with 100 bullets to get 10 within .1grn +/- 164.9 to 165grn
Next i weighed each charge on the digi scale to within a few roach droppings of 40.5grn my hope is that these 10 will group significantly tighter than the rest of the 90 bullets that only get the powder weighed. And the bullets are .5grn+/- the case are 1.0grn +/- all the cases and bullets were from a single batch from the mfg. Ill get back to yall.
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