Gents

I have a great load with R 19 in my rifle for 140gr bullets. I have some 160gr Speers GS and some 175gr Speers GS to load and try out in my rifle. Is there a particular powder I can use that might be better suited for this caliber and the heavier bullets I am looking to test out? Thanks

4350 and 4831 have both worked well with heavy bullets in the 7x57s I have.

I use H450 and have had very good results at long range.

In my #1, 175gr bullets works well with H4350.

Hello,

THE powder for heavy bullets in the 7x57 is the R22 or NORMA MRP.
I can get 2750 f/s with 160 grs and 2650 f/s 175 grs bullets in my Mauser 98 (1935) with Winchester cases and 24" barrel. I can load that cases minimum of 7 times without any trouble. The barrel is an original one with CIP dimentions. So the magazine and free bore lenght allow a cartridge of 83 mm OAL (3,27/3,3")depending the shape of the bullet.
This loads are not absolute maximum in my rifle.
As an example, NOSLER data shows a max load of almost 2600 f/s with 175 grs Partition bullets in 22"...

Good Luck!

PH

well I chose not to load the 175's and just loaded some GS 160 and some Sierra 160 and went with IMR 4350 to try out. Going to the range on wednesday for some trigger time. FS

well I did make out and shot 5 groups of 160 loads, 3 with the Speer 160 GS and 2 with the Sierra BT 160.
My rifle is a 95 Chillean Mauser with a 26 inch medium contour shillen barrel.
On the magnetospeed the speer average was 2640 and the sierra 2726 with 46.5 gr of IMR 4350. Both loads shot slightly under 1 inch groups. as with many loads the higher charges seemed to group tighter. I may try going up a grain from here and see how things look.,,, FS

I use H414 with all bullet weights in my 7x57, most of which have long magazines (06 length) and long throats to match..The one exception is my newer Ruger International SS and wood stocked manlicher, however I use a lot more H414 even in it as the books call for as te reloading manuals for the most part really underload the 8x57 and 7x57, due to frivoulous law suits and the number of weak actioned 7x57s that are floating around, but in modern or proper 7x57 the PSI can be what one would go by in a Rem 700 or Win. mod. 70..

That said I can get 2599 FPS ( 10 shot average ) with a relatively mild response pressure wise with H414 in the Rugers 18.5 inch barrel and 2688 FPS in my long throated 7x57s with the 175 gr. Nosler Partition.

I have used this particular combo on deer, elk, black bear, and all manor of plains game.

I have used the book max loads with RL-19 and had decent results with the Ruger Int. but still prefer H414 and at some point will lengthen the magazime and throat on it.