Safe to Shoot in a 7x57 Spanish Mauser M1916

[Singer B]

I picked up a Spanish Mauser M1916 in 7x57 a couple of months ago in excellent condition (manufactured in 1922). It functions perfectly and I have run about 40 rounds of commercial 7x57 ammo through it with no problems. Yesterday, I picked up a bunch of 7x57 reloaded ammo at an auction (along with an interesting .32 caliber Astra 300 but that is a different story). I am wondering if this ammo is safe to shoot in my M1916. Each lot is marked with what I assume is reloading data (I know nothing about reloading). Can some of you with reloading knowledge advise if these different rounds would be safe to shoot? Thank you and I apologize for the long list:

165gr Cast
155gr JSP 40gr IMR4320
154gr JSP 38.5gr IMR4320
145gr Cast 43.1gr 4451
165gr Cast 27gr 4198
160gr Cast 35gr WW748
165gr Cast 26.8gr IMR4227
145gr FML 41gr LP Military
140gr JSP 42.6gr IMR4320
150gr JSP 39gr IMR4320
155gr JSP 39gr IMR4004
146gr Cast unk IMR4451
145gr JSP 45gr IMR4831
150gr JSP 38.2gr IMR4895
150gr JSP 29gr IMR4320

Once again, thank you for your time and expertise.

Information

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[Ovidio]

I’d love to help, but I never used IMR powder.
If the rifle is a large ring, you can be pretty sure that it’ll be extremely sturdy, but still... I’m very scheptical when it comes to reloads that I didn’t personally assemble.
Did you try and look at the original IMR reloading data?

[Singer B]

I’d love to help, but I never used IMR powder.
If the rifle is a large ring, you can be pretty sure that it’ll be extremely sturdy, but still... I’m very scheptical when it comes to reloads that I didn’t personally assemble.
Did you try and look at the original IMR reloading data?

I know zero about reloading so I wouldn't know what I was reading. That stuff seems very complicated!

[Aragorn243]

Someone else's reloads are a crap shoot. You don't know how good they were for one thing. It's a risk.

I purchased about 12 boxes of 30-06 reloads a few years ago. Figured I'd pull one and check it and weigh it and then weigh all the rest to ensure they are the same before shooting them. Just never got around to it.

So no one can really tell you if they are safe. They can tell you if the loads are safe but not if the loads are correct.

[vintage hunter]

I know zero about reloading so I wouldn't know what I was reading. That stuff seems very complicated!

Reloading rule #1: Never shoot someone's else's reloads.

[Singer B]

Sage advice! Thanks!

[Daan Kemp]

Don't ever use somebody else's reloads. You don't know what the loads actually are without breaking them up and checking each load.

What is safe in your firearm with your reloads might not be in somebody else's firearm.

I would disassemble them and use the cases and bullets. Dispose of the propellant.

[browningautorifle]

You don't know what the loads actually are without breaking them up and checking each load.

And then you still don't actually know what's in them. Just what the contents weigh. You can't tell what it is for sure by looking at it. Someone else's reloads are just useful for bullets and cases...maybe primer but you still can't be sure what they are.