7 MM Rem Mag loads

[NCsmitty]

The short answer is NO, do not use a slow powder to reduce the powder charge below the recommended charge.

Here is a quote from another site, and it explains what can happen if conditions are met to cause a delayed detonation.

Another thing that can happen with reduced loads is when the primer flash goes the entire length of a cartridge that is loaded with slow burning powder, they coat the grains of powder to retard quick ignition....the flash just partially ignites the powder, just enough to kick the bullet into the rifling...then the rest of the powder kicks off with an obstuction in the bore...KaBoom! Pipe Bomb!

There are powders that can be used in reduced loads. www.hodgdon.com has information on their site for using H4895 for youth loads. The results have reduced recoil and muzzle blast, but still viable for hunting. It is under youth loads on the initial page. It's a pdf file.



NCsmitty

 

[nastynatesfish]

You should just go to 7-08. If your loading that light its kinda a waste and it wouldn't do the cartridge justice

 

[SifuGun]

Of course i was asking on theoretically. I have concluded you would need a lighter primer if you loaded lest powder than specified. A magnum rifle primer with a smaller charge could, I am guessing here, kick the bullet into the rifling sooner. And when the powder charge catches up, kaboom, pipe bomb like NCsmitty quoted. I'll look into loading up Youth rounds when i decide to load lighter rounds. Thanks for you help NCsmitty.

 

[coug]

no do not ever load a magnum case below min. it can detonate and blow up in your face. the manual that you are using loads about everything cold. I shoot 68 grns of RL 22 behind a 150grn combined technology we, me my uncle and my cousin shoot it in 3 different rifles. 2 rem 700s and a savage 116. no pressure trouble. supper accurate in all 3. I also shoot 73.5 grns of RL25 behind a 140grn speer boat tail. I woulnt try 25 or retumbo in your 24inch barrel. but your rifles max loads are custom to your rifle. be sure that you never down load a magnum of any kind. if you can get your hands on P.O. acklys books read them that man will teach you 90% of what you need to no and understand about realoading .

 

[TonyM]

I don't know for sure, but the way I understand it is that it is unsafe to go below min loads...

 

[redneck2]

It isn't the magnum primer. Modern smokeless powder has a burn deterrent coating to regulate the burn rate. If you load too light, the burn characteristics go way out of whack. It takes a given amount of heat and pressure to make the powder burn correctly. Going below minimums drops below that effective heat/pressure range. Bad ju-ju starts to happen.

Typically, for reduced loads you use a faster powder. This is because faster powder has less of the coating, which makes it light easier and makes it more consistent in lower pressure/heat situations (reduced loads).

There was a very good article in Handloader Magazine about reduced loads using Trailboss.

Also, you can get a Lyman reloading manual that gives cast bullet info (uses reduced loads and powder)

 

[SifuGun]

Hey Forum,

I noticed some groves on sloped shoulder of my 7mm rounds. You can see it the picture. What is this? And is it safe to shoot? Remember these rounds headspace off the band. This only happens on about 2 rounds. I backed out the case resizing die a quarter turn and it seems like it stopped doing this. What do you think forum?

 

[TonyM]

I had that happen when I used to much case lube-- I believe they are called hydraulic dents, regardless, I threw them away, however they were much worse than those in the image you posted, and I hadn't loaded the ammunition. I have, however, shot rounds with small case dents with no issues, the pressure actually removed the dents... I always try to err on side of caution-- if you've got a puller you can just pull the bullets and toss the brass... How many rounds are you talking about?

 

[NCsmitty]

It's lube dents as TonyM mentioned. You need to wipe your FL die internals of excess lube first.
Use the case lubricant on a pad and it's likely you'll not experience the issue again. I'm guessing that you are overspraying, if you are using that type of lube. If you are wiping lube on with your fingers, be careful not to glob it on the shoulder of the case.

Firing those cases will pop the dents out, and it's not necessary to toss them out.



NCsmitty

 

[SifuGun]

Thanks TonyM, NCsmitty thanks again you are a great help!