a few years back I was shootin with this guy, he had the fancy weatherby fluted barrell, I think it was a mark V donno much about weatherbys. His rifle was a 300 wby, but he was shooting winchesters 300win mag cartridges thru his rifle. Is that safe or can be done. I wasnt thinking so but he said it was fine. He also said he could kill an elk at 1000yds too, I don't think so from the way his groups were.

It is my understanding that you can fire the .300Win in the .300Wby chamber, but as the Winchester case fire-forms to the Weatherby chamber the neck shortens considerably and may not be salvagable for reloading. Also the .375H&H can be fired in the .375Wby chamber. I wouldnt make a habit out of this but I know of others who have done this. Rodney.

Carefull...there seems to be quite a few on this forum that are 1000 yrd killing machines just waiting to be woke up.

As far as his bad shooting....he might be a good shot but his round of choice was probably why his groups were bad. The .300 win will shoot in a .300 Roy but I doupt drive tacks.

Good god what would the hold over for .300 Roy with say a 180 grn. bullet @ 1000 yrds be?

Anyone know what it is? Its feet and lots of them.

I dont know but I will throw out a dumb try.

10 feet with a .300 Roy shooting a 180 grner.???? This is my try.

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10 feet with a .300 Roy shooting a 180 grner.???? This is my try

Program shows with a 200yd zero the bullet is 256" low at 1000.

Well obviously he's illiterate as it clearly states on the barrel USE ONLY .300 WBY MAG (WEATHERBY MAGNUM) if it's a real Weatherby, so it would come as no surprise that he can't tell yards from feet nor is it likely he could actually count to 1000 anyways.

The round will chamber, yes. It will go off if you pull the trigger. The brass will get bent all out of shape and it will be absolutely terrible on the throat. Accuracy would be horrible and velocity would be unpredictable.

It is not safe and in fact very irresponsible to do such a thing in any situation outside of a test lab with copious safety measures in place. It is not a case of firing a round in an "improved" chamber based on an original like a .375 H&H to a .375 Weatherby or a straight-walled shorter case which headspaces on a belt like a .458 Winchester Magnum in a .458 Lott.

I would move to the far end of the range if someone sat down next to me and started firing Win Mag rounds through his Weatherby. If he's got the money to buy a Mark V, he should be able to afford to feed it appropriately. More money than brains I guess.

Back in October 2005 I served as RO for our gunclub's public deer rifle sight-in. Early in the afternoon I was pacing the line. I stopped to watch a family of three each taking turns with their 300 Weatherbys in their shiny new shooting cradle. A collection of brass lay in the gravel beside the bench. The empties just didn't look right. The necks were too short, way too short. I picked one up. The customary double venturi shoulder was there but the neck stop perhaps .15 past the last curve. Could it be? Would anyone be so stupid? I turned the case over to read the headstamp...yup, 300 Winchester Magnum! "Excuse me sir" I interrupted before his next shot "Do you know you're using 300 Win Mag ammo in your 300 Weatherby?" The answer I dreaded most was only a moment in coming "Oh yeah, we figured it would be a cheaper way to get 'em on the paper". I told him I couldn't let him do that anymore today. He grunted and switched to real Weatherby ammo.

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Originally posted by ramrod340:

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10 feet with a .300 Roy shooting a 180 grner.???? This is my try

Program shows with a 200yd zero the bullet is 256" low at 1000.

Man was I wrong....21ft 4 inches how cool.

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Originally posted by ted thorn:

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Originally posted by ramrod340:

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10 feet with a .300 Roy shooting a 180 grner.???? This is my try

Program shows with a 200yd zero the bullet is 256" low at 1000.

Man was I wrong....21ft 4 inches how cool.

Could you imagine? You'd have to level your crosshairs on the treetops just to hit your target!

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Originally posted by MikeyB:

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Originally posted by ted thorn:

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Originally posted by ramrod340:

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10 feet with a .300 Roy shooting a 180 grner.???? This is my try

Program shows with a 200yd zero the bullet is 256" low at 1000.

Man was I wrong....21ft 4 inches how cool.

Could you imagine? You'd have to level your crosshairs on the treetops just to hit your target!

Now listen.....I seen the movie "Shooter" one mile is no problem......1000 yard moving target is no problem......2 men with bolt guns vs........hell you get the picture

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More money than brains I guess.

Unfortunately, I see way too many of these nowdays.

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Originally posted by ramrod340:

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10 feet with a .300 Roy shooting a 180 grner.???? This is my try

Program shows with a 200yd zero the bullet is 256" low at 1000.

21feet 4inches... how much holdover is that in terms of field of view in a 20x rifle scope?

AD

Shooting a 375 H&H in a 375 Wby is fine; that's how you fireform the brass. Did you mean shooting a 375 H&H in a 378 Wby? That would be ruinous to firearm and shooter!

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21feet 4inches... how much holdover is that in terms of field of view in a 20x rifle scope

Well my Burris 6.5x20 says it has a 6' field of view at 100yds. Would that not be 60' at 1000?

Sometimes a little bit of knowledge can be dangerous. Getting back to Kennedy's question"is it safe,can it be done" Well certainly it can be done but I don't think its all that safe. Think about how a brass case is annealed. There are 3 separte sections to a brass case with 3 different hardness's. the case head is made to hold the primer without expanding excessively at approx 60,000 psi.The brass in the case head is quite hard. The middle section of the case is softer. It expands to perfectly fit the chamber walls when the cartridge is fired then rebound slightlyoff the chamber walls so the case extracts easily. The neck and shoulder area is annealed quite soft so it expands and forms the gas seal that holds that 60,000psi in the case so that pressure can act on the bullet and push it down the barrel. If you are fireforming cases in a rifle such as 300 H&H cases in a 300 Wby chamber or 375 H&H in a 375 Wby chamber you have cases that are the same length and you have the proper length of soft neck to form a safe gas seal. You take a shorter case like a 300 Win and fire it in a 300 Wby chamber you no longer have a safe length of softbrass in the neck to form that safe gas seal. If that short section of neck doesn't seal the 60.000psi gas that pressure will blow back between the chamber wall and the case. Part of the case may collapse and some of that pressure will be bled back through the action. Depending on what action you have some handle that pressure quite well and other may blow that back in your face.On a bad day that could cost the shooter the sight in one or both his eyes. Just think of the money he could save on shells after that ! I'm not suggesting that you shouldn't fireform cases. When done properly it is not a dangerous thing. But before you start get some help from someone with some experience so you know what you are doing .

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Originally posted by tiggertate:
Shooting a 375 H&H in a 375 Wby is fine; that's how you fireform the brass. Did you mean shooting a 375 H&H in a 378 Wby? That would be ruinous to firearm and shooter!

No, I mean shooting a .300 Win Mag in a .300 Wby Mag is not safe in contrast to shooting a .375 H&H Mag in a .375 Wby Mag, which is safe. Should have been a bit more clear in my wording

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Originally posted by Kennedy

a few years back I was shootin with this guy, he had the fancy weatherby fluted barrell, I think it was a mark V donno much about weatherbys. His rifle was a 300 wby, but he was shooting winchesters 300win mag cartridges thru his rifle. Is that safe or can be done. I wasnt thinking so but he said it was fine. He also said he could kill an elk at 1000yds too, I don't think so from the way his groups were.

That Weatherby might have been a Vanguard rather than a Mark V, in which case, that Weatherby may have been a Weatherby Vanguard factory chambered for the .300 Winchester Magnum. I think the Vanguard could be fitted into a Mk V shiny stock with a bit of sanding and shimmying. Just a thought - don't know 'cause I wasn't there to see it for myself.

Namibiahunter

Don't try this at home! Here is a pic of what I mentioned in my above post of what the neck looks like of a 300 Winchester Magnum fired in a 300 Weatherby Magnum. Again this is really NOT a good idea. Rodney.

It is the 300 h+h that fireforms to the weatherby as the 375 h+h does to the 375 wby. as shown above the 300wm is a no no.

I agree with buckeyeshooter as the 300WinMag is a definate no no in a 300 Weatherby. The three cases shown above were up at a local gun shop on display with some other no no stuff. Just wanted to get a pic on here to show how the neck is grossly shortened in the wrong chamber. Rodney.

Yeah, I've seen precisely that sort of fireforming being done. Not quite so scary as the dad who thought his son's new 25'06 was a 243, but still plenty of retroactive pucker factor. "Let's be careful out there people."

Come on guys, everyone knows you use a 300 yd zero with a Roy. That with my old load would make you hold over just 18.08'. Surely knowone would hold over that much. But with a target turret you can surely hit targets that far. No I am not recommending shooting game that far. Maybe half that distance would be alright. God Bless, Louis

A guy who is shooting a 300 WM in a 300 WBY isn't going to hit much at 1k, but it's not like 21 feet 4 inches of drop is impossible. If you're using a good scope with repeatable adjustments you can dial yourself in for 1k and beyond...