Ruger M77RL .257 Roberts

[3DTESTIFY]

I own a new M77RL MKII ultralight in .257 Roberts. Is this rifle capable of firing the Hornady Light Magnum .257 Roberts +P cartridge in that lightweight 20" barrel? Ruger's manual does not specify on this subject.

[flintlock]

Yep...no problem at all...It may not group as well as the regular Hornadys, but the rifle will take the extra pressure...

[257 roberts]

Hornaday Lt Mag is what I use in my Win70 257 Robt.
Its smokin on deer!!!

[3DTESTIFY]

Thanks for the info, it confirmed what I suspected. Tell me, do you shoot the 117gr. SST or the 117gr. SP Interlock light magnum load?

[257 roberts]

I shoot the interlock( I bought 10bxs)
I've neck shot them and punched them threw the shoulders, everyone so far just drop.

[3DTESTIFY]

That's good news, since I purchased 4 boxes of just that loading.  I'm new to the .257 Bob & really am enjoying this rifle. I'll soon start reloading with the +P Hornady brass & see what this cartridge can really do. Thanks so much.

[Coyote Hunter]

That's good news, since I purchased 4 boxes of just that loading.  I'm new to the .257 Bob & really am enjoying this rifle. I'll soon start reloading with the +P Hornady brass & see what this cartridge can really do. Thanks so much.

3D –

The answer is the Ruger action on your rifle is the same one they barrel for 52,000 CUP, 54,000 CUP and 63,000+ PSI loads.  No need to worry about 50,000 CUP 2257 Roberts +P loads.

Congrats on your new rifle!  Got mine (standard 22” M77R) a couple years ago and it has become my favorite bolt gun.  Here’s what min does:

3609fps = 75g V-MAX and H4895
3163fps = 110g Accubond and H4350
2958fps = 115g TSX and H4831SC
3013fps = 115g TSX and H4350
2899fps = 120g Grand Slam and H4831SC
2904fps = 120g Partition and H4831SC
2947fps = 120g A-Frame and H4831SC

All loads with WW +P brass and CCI 250 primers.

Several weeks ago the 75g V-Max load put 3 shots into a group measuring 0.232” center-to-center at 100 yards.  And a couple weeks ago I took a coyote with this load at 479 lasered yards.  The Roberts has a lot of “can do”.

Have fun!

[3DTESTIFY]

Coyote Hunter, thanks so much for all the great info from your testing experience. This will help guide me in starting the reloading process for this cartridge.

[Coyote Hunter]

Coyote Hunter, thanks so much for all the great info from your testing experience. This will help guide me in starting the reloading process for this cartridge.

3D -

Be aware that my Ruger has a ver y long throat - I don't come anywhere near the lands - kind of like q Weatherby, I guess.  If yours is short (or normal) throated, you may not get the same velocity.

Take care.

[N. Michigan]

If you read the history about the 257 Roberts, you will find it has never been pushed to its full potential. This was mainly due to the difference of barrel throats not being consistant throughout manufactures. The exception to the rule were custom rifles and hand loaders.