Weatherby Rounds!

[sable tireur]

Increasing the neck tension, crimping as well as pushing the bullet deeper into the case to increase the jump to the lands, all increase pressure. That's why we test and adjust loads.

Yes the military requires a sealant between the bullet and case neck.

 

[AZShooter]

I thought the bullet would move out of the case during recoil. I know it is that way with revolvers and a bullet that moves out of the case too far will lock up the cylinder.

Perhaps the magazine box has an influence in reverse? I have seen battered soft tips on the bottom most cartridge in a rifle magazine. Tried to find the answer with some searching to no avail. Most articles simply say bullet movement.

I know that Lazzaroni uses some sort of locktite on his NP3 coated bullets to keep them in the case.

 

[Canhunter35]

The only way I could get 90gr gmx bullets to shoot as well as factory loads was to crimp on the cannelure in my 257.
Yet it shot 115bt and vlds even better without a crimp.
I don't crimp any of my 300 or 240 loads either

 

[J E Custom]

There are many reasons to crimp or not to crimp. Weatherby used to crimp ALL of there Magnums and many other ammo makers did. But with all the emphasis on Bullet BC now, bullet Canelures are almost
extinct so crimping is almost gone.

The problem is that some cartridges still perform better crimped. A re loader can find out very easy if he wants to by testing.

I have improved SDs by crimping some cartridges as long as I had bullets with canelures for them. Most people assume that a crimp is used solely to prevent the bullet from being pushed back in the case when another round is fired. This is the main purpose on straight sided cases that don't have the grip that shouldered can have. but on some loads, it helps the powder to get a more even burn rate. Improved loading practices can all but eliminate this so the need is not as great anymore, And fewer and fewer bullets can be found with a canelure.

Over crimping can cause more problems, and should be avoided at all cost.

J E CUSTOM

 

[Deleted member 107796]

Respectfully, I don't agree that crimping is almost gone. I see crimping on every off the shelf cannelured bullet I have right now. As far as increased pressure, yes it can increase pressure although it is not a given but yet has been held within pressure specs for as long as proper crimping has been done. Yes, it is an extra step but it is a die adjustment or process that can be controlled as any die process can be. I would venture to say that for the manufacturers, they just want no slip, but that being said, any expert shooter out there (not I!) will tell you that uniform neck tension is the key to precision and accuracy. I started crimping for my magnums and especially my WSMs given their short throats which can tend to slip under low force. I have successfully achieved excellent crimped loads for my WSMs and 338WM. I'd consider test loads for the 300.

In my opinion, crimping for handloads is more of a factor of uniform ignition, vs slippage, but in a rifle cartridge, there has to be some effect on ignition also. Without question, another variable, whether one advocates crimping or not.

 

[J E Custom]

Respectfully, I don't agree that crimping is almost gone. I see crimping on every off the shelf cannelured bullet I have right now. As far as increased pressure, yes it can increase pressure although it is not a given but yet has been held within pressure specs for as long as proper crimping has been done. Yes, it is an extra step but it is a die adjustment or process that can be controlled as any die process can be. I would venture to say that for the manufacturers, they just want no slip, but that being said, any expert shooter out there (not I!) will tell you that uniform neck tension is the key to precision and accuracy. I started crimping for my magnums and especially my WSMs given their short throats which can tend to slip under low force. I have successfully achieved excellent crimped loads for my WSMs and 338WM. I'd consider test loads for the 300.

In my opinion, crimping for handloads is more of a factor of uniform ignition, vs slippage, but in a rifle cartridge, there has to be some effect on ignition also. Without question, another variable, whether one advocates crimping or not.

I totally agree with you but try to find High BC bullets with Canelures any more. Most are flat base when and if you can find them.

I still use them when I can find them in some of my rifles but they are for short range use normally.

Like everything else in this sport, I/we have to look at all possibilities when seeking the best performance in a rifle. crimping or not is just one of those.

J E CUSTOM

 

[Alibiiv]

I guess my next question is....
Since I am just now starting to reload, would me picking up one of the Lee Factory crimp die and using it have any negative to it? I think I can figure the neck tension out BUT IF it doesn't hurt....it would be like training wheels lol

If you put too much crimp on your bullet, you are going to wrinkle your brass. The only crimping I would do, if I were crimping a bottleneck case, would be on a bullet with a cannular groove, or.....with a very light taper-crimp. I've reloaded many cartridges of many calibers and have never encountered a time when I needed a crimp on a bottle necked case. Not saying it is not necessary, just have never seen or needed one myself. The only crimping I do is on cases that are going into a tubular magazine such as a 30-30/35Remington or all my straight walled cartridges like the 45-70 going into the Marin Guide Gun; these bullets do have a cannular groove.

 

[sodakota]

Only have one Weatherby - 300. I don't crimp. Maybe a hard kicker like a 378 or 460???

 

[Pauleye]

300 weatherby. No crimp never a problem.

 

[arch408]

Lee claims the crimping causes more uniform ignition resulting in more consistent performance. I'm not entirely convinced and I only crimp on ammo that requires it, which includes ammo fired in AR15's. I know some one that blew up 2 AR15's on the same day and the concences was the bullets were shoved back into the case during clambering. Some day, I will load some ammo exactly alike except half will crimped and I'll compare the two for velocity and accuracy.

 

[skipglo]

i know a lot if not most on here don't think you need a crimp on your handloads.....BUT, in the nosler manual and from another buddy of mine, both seem to think the Weatherby rounds do better with a factory crimp on them, the nosler manual doesn't say this for other rounds, so I was wondering if anyone has any experience/advice with the Weatherby reloading and if crimping is something I want to do with them, I shoot a 300 and a 257 Weatherby so it's not like it would be a lot to pick up two lee factory crimp dies. Any info is appreciated

I have shot Weatherby 300 for 14 years now and have not crimped and have found no reason to. The same with our 257s...

 

[Dell]

i know a lot if not most on here don't think you need a crimp on your handloads.....BUT, in the nosler manual and from another buddy of mine, both seem to think the Weatherby rounds do better with a factory crimp on them, the nosler manual doesn't say this for other rounds, so I was wondering if anyone has any experience/advice with the Weatherby reloading and if crimping is something I want to do with them, I shoot a 300 and a 257 Weatherby so it's not like it would be a lot to pick up two lee factory crimp dies. Any info is appreciated

I'd never crimp a bolt gun round. Weatherby or otherwise.

 

[Dell]

I guess my next question is....
Since I am just now starting to reload, would me picking up one of the Lee Factory crimp die and using it have any negative to it? I think I can figure the neck tension out BUT IF it doesn't hurt....it would be like training wheels lol

It is totally about proper neck t

 

[sable tireur]

Some day, I will load some ammo exactly alike except half will crimped and I'll compare the two for velocity and accuracy.

This link was posted on the 1st page of this topic and ignored obviously:

http://www.accuratereloading.com/crimping.html

So here it is copied to save you the effort of reloading and reading:

 

[Dell]

It is totally about proper neck t

It is totally about proper neck tension. I shoot a 7mm Rem. Mag and a .300 Win. Mag. I've never crimped any. If you think it may be necessary, get a crimp die and give it a try. Load 5 rounds and crimp em'. Load 5 with proper neck tension with no crimp. Shoot both for groups. Bet you won't be crimping bolt gun rounds any more