7MM Mauser---loads.

[mag_01]

Looking for loads using a 130gr. boolit either gas checked or non gas checked----A little bit of cabin fever is beating on me---- So I thought I would load some 7MM Mauser rounds---Hot or cold----any loads would be appreciated----Or should I just go with 16 or 18 of 2400---Dose anyone know the limit using 2400 with the 130 boolit------Thanks All----Mag

[RayinNH]

mag_01, FWIW, I shoot the RCBS 168-SP boolit (168gr.). I use 10.3 grains of Green Dot thrown with a Lee spoon. It's a very mild load, but the best load that this 1908 Brazilian Mauser has liked so far. Ten shot groups at 50 yards are at about 2". The mold will only produce a .285 boolit and this rifle slugs at .288, so you can see the obvious problem...Ray

[Buckshot]

................I don't have that Lee boolit, but a friend of mine used it for some pretty good accuracy in a Rem RB in 7x57. FOr a plinker he used 700X (load unknown) or 21.0grs of H4198 + dacron.

................Buckshot

[Norton]

I want to cast a 7x57 deer hunting boolit for a brand new Russian over and under combo rifle shotgun. I have never cast for the 7mm and want to make a good hunting round by next season. The shooting distance would be around 50 to 100 yards max. I do not have a mold yet, but want to use gas check and a cold lube sized in a RCBS sizer. Any suggestions would be appreciated, I can find a powder load from a my Lyman book.
thanks

[Larry Gibson]

Looking for loads using a 130gr. boolit either gas checked or non gas checked----A little bit of cabin fever is beating on me---- So I thought I would load some 7MM Mauser rounds---Hot or cold----any loads would be appreciated----Or should I just go with 16 or 18 of 2400---Dose anyone know the limit using 2400 with the 130 boolit------Thanks All----Mag

For the non GC a good plinking load would be 8-10 gr Unique or 5-6 gr Bullseye. For the GC 130 gr bullet try 13-14 gr 2400, 12-17 gr 4759 or 20-23 gr of 4895. If this is for a milsurp barrel many range upwards of .288" groove depth so size accordingly.

Larry Gibson

[Larry Gibson]

I want to cast a 7x57 deer hunting boolit for a brand new Russian over and under combo rifle shotgun. I have never cast for the 7mm and want to make a good hunting round by next season. The shooting distance would be around 50 to 100 yards max. I do not have a mold yet, but want to use gas check and a cold lube sized in a RCBS sizer. Any suggestions would be appreciated, I can find a powder load from a my Lyman book.
thanks

I've one of the original RCBS (kind of a semi Loverin design) 28-168-FN which casts a nice bullet with a large flat meplat. Mine run right aroun 175 gr lubed and GC'd. You might try to find one or the newer RCBS 7mm-168-sp might be ok but the meplat is not as large as the original design. Were I to get another 7mm mould for hunting I would get the Saeco #270, a 145 gr bullet with a very large meplat. I'm getting very good hunting accuracy out of my sporterized M95 Chilean with 22" barrel using 29 gr of H4895 and a dacron filler with the 28-168-FN bullet, Velocity is right at 1900 fps.

Larry Gibson

[Norton]

Thanks for the info Larry and advice on the boolits. Do you get good results with the filler? I have read about it in a 1990 dated casting publication but never tried it. Do you use it only for cast projects or for general reloading of factory bullets?

[mag_01]

Thanks guys for the input-- will have to try some of those loads as I have the 7MM dies in the press.----Mag

[Larry Gibson]

Thanks for the info Larry and advice on the boolits. Do you get good results with the filler? I have read about it in a 1990 dated casting publication but never tried it. Do you use it only for cast projects or for general reloading of factory bullets?

I started out years ago using a dacron wad as that was recommended back the and the wrapper from Javelina lube could be sent in with 50 cents for some. The wad was recommended for consistant internal ballistics (basicly minimal shot to shot variation) by positioning the powder back against the flash hole. I then found the wad wasn't necessary with appropriate quick burning powders. With light for caliber bullets or velocities at the low end "positioning" of these fast powders wasn't critical. I found the wads did help with more consistant velocity the medium burning powders. I've had Oehler chronographs since the mid '70s. I fired thousands of rounds with these wads in them with nary a problem nor any sign of a problem indicatated by pressure spikes.

I did run into one problem though. With top end loads that had a little recoil the bottom rounds in magazines would hang fire (i.e. click - bang). A little investigation revealed the recoil was unseating the wad moving it forward. In some instances the powder migrated over, around and through the wad creating the hang fires. I then developed filler loads with the dacron. These require about twice the amount of dacron that I was using for a wad. I use enough dacron to fill the space between powder and bullet. The dacron is pushed into the case with a small rod until al of it is just inside the neck. Seating the bullet does the final compression of the dacron onto the powder. Since using this method I not had a single hang fire and have actually more consistant loads with the medium buning powders (4895, 3031, etc).

I use the dacron filler only with cast bullets. I've not found a need for it's use with jacketed bullets though some have.

Larry Gibson

[azcoyhunter]

I own the LEE 7x57 Mould

If you want some sample boolits

Let me know.

I feel it is too small, but that is only my 2 cents worth.


Clinr

[MtGun44]

A few 7x57 groups from my Ruger 77. Note the radical difference
one grain of powder can make, from 18 gr to 19 gr.

My rifle likes the 150 LBT better, esp when cavity matched.

Bill

[Buckshot]

................Here's a couple targets:



The above were fired from a military issue Brazilian M1908 chambered 7x57. The load was a caseload of the indicated surplus powders. Velocities indicated by both groups. IIRC without going out to look it was like 62.0grs. Cases had been fired several times and neck sized only. The boolit was the RCBS 7mm-168 which weighed 172grs with lube and GC.



Same load fired in a M1897 Rem RB.

Both rifles full issue, iron sights, trigger etc, etc. Range wa0 s50 yards and the velocities similar (both 29" bbls).

..............Buckshot

[mag_01]

Thanks all appreciate the input-It is a pleasure to shoot this cartridge well truthfully there are lot that fall into this category .--- Mag