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Hi all,
I am in the process of developing loads for a 505 Gibbs with Woodleigh 600gr PP.
Data is thin on the ground and what I can find is for very fast (in this case capacity) powders, such as RE15 and Varget. I have tried H4350, RE22 and RE25 with mixed results. I am after ANY sources of loads with modern slower powders in the 2300fps range with 600gr bullets. I realise that these levels will be higher than the original pressure parameters, but it is a modern rifle with modern brass and will handle the increased pressure, as the same basic case is used to make both the 505 and CheyTac hulls.
Thanks in advance guys.

Cheers.
cool

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I don't have it handy but Phil Shoemaker had an article on the 505 in the August 1999 issue of Handloader.

Even though RL15, Varget and H-4350 are on the fast side for the case, 600 gr @ 2300 should be no problem with those powders. In my 500 Jeffrey my starting load of 100 gr of RL15 pushed 600gr 2200 fps.

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I don't have my loads at hand but had great luck with both Norma MRP and AA 5744.


Phil Shoemaker
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Anyone who claims the 30-06 is not effective has either not used one, or else is unwittingly commenting on their marksmanship.
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Gunner500 has one and I'm sure he would share his pet load(s).

Send him a PM.

DF

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eek Buncha fuqkin masochists!!!!


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Originally Posted by EvilTwin
eek Buncha fuqkin masochists!!!!

laugh

Now, you know you're including your ole black powder, Sharps shooting bud, Gunner500... shocked

DF

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grin When I wuz young (17)and DUMB and fulla come, I fired THREE rounds of 505 Gibbs. Lesson learned!!!!!!! grin


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The 505 is gunner's truck gun.

He needs the firepower for those great big ole Okie 'dillers... grin

DF

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A ten and a half pound 505 Gibbs with the original Kynoch loads pushing a 525 gr bullet at 2150fps ( yes that is what they and virtually all the older English rounds actually chronographed) is not much more punishing than a 458 or 470.


Phil Shoemaker
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www.grizzlyskinsofalaska.com

Anyone who claims the 30-06 is not effective has either not used one, or else is unwittingly commenting on their marksmanship.
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When the 600 Overkill was being developed I thought, oh I gotta have one. Then I got my 500 Jeffrey back from the gunsmith and put together a few starter loads. After lighting off three 600 gr pills over 100 gr RL15 that clocked right at 2200 fps my enthusiasm for something bigger was completely gone.

While I appreciate the wonderful history of the Gibbs, I just can't see burning even more powder in a sporter weight 50. If I was to do a 50 again it would be the 500 A-sq. More than enough in the fuel tank and relatively speaking easy to come by brass.

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Guess I'm a wuss... frown

I traded my .404J after rotator cuff surgery... whistle

Kept my .375 H&H, both guns, SS M-70 Classic NH actions.

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I read the thread title, and said, "Ouch. Ack"

And I'd like to have a moderately lightweight .416 Rigby smile


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One thing about buying a used LW .416R, the barrel should be in good shape... grin

Gunner's 505G is a rebore of his .416R that he actually shot out. Yeah, you heard that right... smile

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Originally Posted by 416RigbyHunter
Hi all,
I am in the process of developing loads for a 505 Gibbs with Woodleigh 600gr PP.
Data is thin on the ground and what I can find is for very fast (in this case capacity) powders, such as RE15 and Varget. I have tried H4350, RE22 and RE25 with mixed results. I am after ANY sources of loads with modern slower powders in the 2300fps range with 600gr bullets. I realise that these levels will be higher than the original pressure parameters, but it is a modern rifle with modern brass and will handle the increased pressure, as the same basic case is used to make both the 505 and CheyTac hulls.
Thanks in advance guys.

Cheers.
cool


My 24" barreled 505 Gibbs with 145 grs Retumbo under a 600 gr Woodleigh PP bullet will run a very accurate 2450 fps, same/same with 143 grs of the same powder under the 600 gr Woodleigh solid.

I ran these loads to max power to check relative relation between stock bolts and bedding with the walnut, all was good at those velocity/recoil levels.

Subsequent loads are loaded to a more sedate, yet I believe to be as effective 2150 fps, good luck, she's a helluva round.


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Originally Posted by Dirtfarmer
One thing about buying a used LW .416R, the barrel should be in good shape... grin

Gunner's 505G is a rebore of his .416R that he actually shot out. Yeah, you heard that right... smile

DF


laugh, hey, that was our little secret. laugh


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Originally Posted by gunner500
Originally Posted by Dirtfarmer
One thing about buying a used LW .416R, the barrel should be in good shape... grin

Gunner's 505G is a rebore of his .416R that he actually shot out. Yeah, you heard that right... smile

DF


laugh, hey, that was our little secret. laugh

Out of the closet now... shocked

laugh

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Thanks to all that replied. I am having internet problems here in Australia.
Currently, I have tried RE22, RE25, H1000, H4350 and RE15, RE15 was no good without filler being used.
I have Retumbo on hand, so I will give that a try next. My rifle is a CZ 550 custom shop rifle with a mercury recoil reducer, recoil is stiffer than my 500 Nitro double, but that rifle is a few pounds heavier and only pushes 570gr pills to close on 2200fps.
I have pushed 600gr PP's above 2350fps in the 505, but a visit to the dentist may be in order if I shoot 15-20 of those off in a session!
Thanks again Gunner500.

Cheers.

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You're welcome 416RH. smile


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My favorite buffalo hunting round is a 525 grain TSX over 145 grains of RL-25. It is a bit more accurate over 145.5 grains of powder, but that is moving faster than I need and gives a huge muzzle flash. Out of my Ruger they will shoot a 3 shot group with all the holes touching at 50 yards. And it shoots within about 3" of that POI at 100 yards... I would not be afraid to shoot PG, or a follow up (not that is has been needed, so far) on a buff at 200 and expect to hit on target, with some force.

I actually don't hand load but have a buddy making these for me. There are probably better powders out there, and I think there is some filler used.

Found a used (well sold as used, but not very!) and very fancy CZ 550 in the 505 Gibbs and ended up owning it. Had to send it back for action/magazine work... Probably should have sprung for the AHR upgrade? Then ended up with a customized Ruger RSM in the same cartridge (rebored from a 416 Rigby). I've hunted in Africa with both, and I can tell you there is no recoil when shooting at big dangerous critters!

Last edited by ABob64; 01/20/16.
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Originally Posted by ABob64
My favorite buffalo hunting round is a 525 grain TSX over 145 grains of RL-25. It is a bit more accurate over 145.5 grains of powder, but that is moving faster than I need and gives a huge muzzle flash. Out of my Ruger they will shoot a 3 shot group with all the holes touching at 50 yards. And it shoots within about 3" of that POI at 100 yards... I would not be afraid to shoot PG, or a follow up (not that is has been needed, so far) on a buff at 200 and expect to hit on target, with some force.

I actually don't hand load but have a buddy making these for me. There are probably better powders out there, and I think there is some filler used.

Found a used (well sold as used, but not very!) and very fancy CZ 550 in the 505 Gibbs and ended up owning it. Had to send it back for action/magazine work... Probably should have sprung for the AHR upgrade? Then ended up with a customized Ruger RSM in the same cartridge (rebored from a 416 Rigby). I've hunted in Africa with both, and I can tell you there is no recoil when shooting at big dangerous critters!


Hey Bob - great to see you here!

Are you saying you can tell the difference between 145 and 145.5gr of powder in the 505?? confused

Tim


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