RMR 69 gr OTMs

[gaijin]

Are the Rifle RMRs (electro) plated?
I know their pistol bullets used to be.
If yes, that could explain the barrel needing “sweetened” with several rds.

[1168]

Are the Rifle RMRs (electro) plated?
I know their pistol bullets used to be.
If yes, that could explain the barrel needing “sweetened” with several rds.

Mine appear to have normal BTHP jackets. The 69s, that is. Which I somehow still haven’t loaded.

[MarshallDodge]

The other possibility I was notionalizing was that the barrel gets happier as it heats up a little.

I don't think heat is a factor but you never know.

On this last trip, I shot two 5 shot groups of 52 CC blems, Group #1 was 0.64" and #2 was 0.75". Mostly horizontal spread and which I attribute to wind. Then I shot some 77 SMK blems, still in inside of 1 MOA.

Next up was the 69 RMR. First five were wild, with a lot of vertical, and the next group settled in. All were loaded with IMR 4320, similar to Varget in burn rate.

[MarshallDodge]

On Sunday, I shot the 69RMR with 23.0(HOT LOAD) SMP735 surplus ball powder, out of my 16" SR-15 with a 1-4X P4Xi, and was pretty happy with how well it shot at 610 yards. The target was a 12x10" flat rock on a hillside and even in varying winds, I was able to hit it repeatedly. The gun shoots great with 77 Noslers but like others, I am looking for an alternative in this drought.

I used .169 G7 BC which is the same as a Hornady 68BTHP, and a rough guess of 2750 FPS.

I zero at 100 but the P3TR reticle is setup for 200 yards. Using the 600 yard hash, which is 13.75 MOA, I hit just below the target. The calculator showed 15.1 MOA so I added 1.25 and it was right on.

[BobinNC]

The gun shoots great with 77 Noslers but like others, I am looking for an alternative in this drought.

What drought??

https://www.gunbroker.com/item/978829607

https://www.gunbroker.com/item/981367595

https://www.bluecollarreloading.com/...petition-53033

https://www.bluecollarreloading.com/...petition-53064

https://ammoyard.com/reloading-compo...llets-per-box/

https://redriverreloading.com/outdoo...250&r=ammoseek

[markm]

The gun shoots great with 77 Noslers but like others, I am looking for an alternative in this drought.

The most Effed up thing is at Midway I can buy 85gr Match Burners ($0.30 each) for cheaper than 77gr OTMs. (at least 0.39 each).

[MarshallDodge]

What drought??

https://www.gunbroker.com/item/978829607

https://www.gunbroker.com/item/981367595

https://www.bluecollarreloading.com/...petition-53033

https://www.bluecollarreloading.com/...petition-53064

https://ammoyard.com/reloading-compo...llets-per-box/

https://redriverreloading.com/outdoo...250&r=ammoseek

Well, they're stupid expensive due to being in limited supply. The last time I bought the 77 was in 2017 for 130 shipped/1K.

Since then I have bought some blems for similar. They shoot pretty good with the occasional flyer.

At 30-35 cents a piece, I'd rather shoot a 75 or 80 ELD out of my bolt gun.

[MegademiC]

I'm not sure I follow what you're trying to say. You shoot a couple groups with 77 grain SMKs, and they're sub MOA. You then shoot a group with 69 grain RMRs and there's 2-4" of vertical deviation, then you shoot a second 5 shot group with 69 grain RMRs that's MOA?

I've read multiple times that some barrels take a few shots to deliver best accuracy after changing what bullets are used. As you mentioned, different manufacturers use different alloys of copper, and it's clear to me that RMR's allow isn't exactly the same as any other bullet I've ever used.

XRF analysis says the RMRs are Bronze 220: 90% Cu, 10% Zn
For comparison, Nosler CC are standard gilding metal: 95% Cu, 5%Zn

**Actual results from 1 reading each: RMR:89.35%Cu, 10.65%Zn | CC: 95.59%Cu, 4.41%Zn
No other XRF-detectable elements (metals) were present in either bullet.

[MarshallDodge]

XRF analysis says the RMRs are Bronze 220: 90% Cu, 10% Zn
For comparison, Nosler CC are standard gilding metal: 95% Cu, 5%Zn

**Actual results from 1 reading each: RMR:89.35%Cu, 10.65%Zn | CC: 95.59%Cu, 4.41%Zn
No other XRF-detectable elements (metals) were present in either bullet.

Good to know!

[markm]

That's moochie interesante! Would that mean the jackets are harder?

(I haven't been able to login to this MFing site in 3 days)