fixin to order on of these, would the 510 be a better choice to utilize more projectile choices?
or would the 600gn Woodleigh softs in .505 be enough for odd angle shots on buff and the like.
Im gonna run em hard, will be lookin for 2300-2500 fps.

Use a .499 diameter bullet and beat the politicians at their own game.

600gn's work fine, as do the 525gn bullets.

Shot quite a few buff from all angles with them.
(Water Buffalo, just as big and heavy as Cape).

Go with the .505 Gibbs or .500 Jeffery.

505 gibbs .. there are plenty of barnes bullets!

BigFiveJack, couldnt find any .499 slugs, interesting none the less.
500N, Im leaning real hard toward the 600gn woodleighs.
Dave Bush, done bought a bunch of 505 brass,
jeffeosso, do you think the 525 TSX will penetrate at least as far as the 600 Woodleighs?

If you build a nice tradition 505 Gibbs, it will always have good resale, if that matters. I dont see much demand for odd ball 510 gibbs. Nor is there any shortage of bullets from all the serious big name suppliers.

quote:

Originally posted by fourbore:
If you build a nice tradition 505 Gibbs, it will always have good resale, if that matters. I dont see much demand for odd ball 510 gibbs. Nor is there any shortage of bullets from all the serious big name suppliers.

Quite true.

.505 it will be.
fourbore, and no its not a nice custom, Im doin a simple rebore on a big RSM, and if I like the caliber and how it shoots, then I will order a nice custom from Wayne @ AHR on a granite mtn. action.

Jerry
on an RSM it might weigh too little to be fun .. where are you located? if in houston, we can probabky get you some stick time with bigbores ..

i've got an rsm in 458 lott that i'll either sell or rebore to 470mbogo .. .505, even on the first generations, is going to be light

jeffeosso,
Im in SE Okla. Please clarify, as in light, do You mean light built {not durable, to much steel removed}
or just light weight, but still safe?
Thanks, Jerry

Jerry,
it will be safe, but it will be light weight, due to overall barrel thickness .. the reboring guys ... i assume you are using the guys that took over for dubell, wouldn't do it any other way.

in my experience .. and your milage may very, the gibbs is the hardest kicking of the 50 sporting rifles .. due to how much powder you HAVE to burn, based off case capacity. you have to use more powder in the gibbs than in the jeffe, than in the a2/wells twins and 500 mbogo , than in the 500 AR .. off the top of my head, its about 140gr of powder to get a 525 to 2350 .. that's a rough guestimate, as I am not looking at load data right now .. in the jeff is 125, in the 500 ar, is 95 .. and it does make a difference.

guys VERY used to shooting full house lotts are ALWAYS suprised at how much more my jeffery kicks than their lotts, in about the same weight rifle ..

os, the direct comparison, of a 500 jeffe in a 9.75 to a 458 lott, in a 9.5 is that the jeffe kicks ALOT more ... well, 535 vs 500gr aint much, and my jeffe loads are 535 at 2300-2350 for my GC cast loads (yes, running cast that fast).. the lott is burning about 83gr MAX, my jeff load is 126gr ... and NOW we are talking 78gr more at 50fps more (ejecta+bullet difference) and it does kick a bunch more ..

a 9# gibbs is going to be nice to carry, though it will kick more than one might like .. EXPECT to add a # of lead and a merc tube ... putting the lead in the forearm to balance the gun slightly nose forward.. which DOES help in high recoil guns .. the merc tube does help more than lead, in my opinion.. others says its no better.. so, a toss up.

it will be a gun, nice looking gun, though!

jeffeosso, Well taken, and Thanks,
I have installed oversized and engraved cross bolts and will full lenght bed w/devcon to insure against stock splitting, that should add a little extra weight.
I believe my rifle has a very dense stock, in 416 Rigby w/ scope and fully loaded it weighed 11lbs 4oz w/ leather sling.
I spose in 505 if it kicks the chew loose in my jaw, Ill just have to step up, lean in and hang on.
Thanks for Your advice.

the .505 rebore should take about 7 oz off the gun .. in the barrel .. it will become slightly more back heavy .. a light nose on a big gun will give you more FELT recoil ..

I used the pac-nor barrel calculator to come up with 6.88 oz less.. and the chamber being recut could go as much as 1.5 oz.

Almost forgot,
Clearwater will do the work, think they took over from LaBounty.

i would defintly go with the 505 i had 1 built by ryan breeding www.rbbigbores.com it was a absolutly awsome rifle but unfortunaly the current situation dictated i sell it or id still have it oh well ill get another.

i was using the 600 grain fmj and softs made by woodleigh ryans web site has load data in 1 of the articals about elephant hunting

Jerry,

I own a CZ in 505. All you need are two bullets. One soft, one solid. At factory velocities, it will shoot thru a Bull Elephant from intake to exhaust valve at 100 yards.

Rich
DRSS
Ryan lives about twenty miles from me

jerry, your instincts are right on. The .510" is more practical, in that there are many more bullets available.

Including heavies from Barnes, in the TSX and FN banded solid.

But if my heart were set on a Gibbs, I would stick with the .505" for no other reasons than nostalgia and that it's a factory loaded round, rather than a wildcat.

But when I was faced with the choice you are making, I went with the .500 A-Square, primarily because of greater .510" bullet availability, plentiful Weatherby brass, more optimal case size, and, in a handy rifle, increased magazine capacity.

BTW, I have tried it, and would not use the 600 grain Woodleight soft (or any Woodleigh soft) at a muzzle velocity in excess of 2,300 fps.

you can get 525 and 600 grain Soft and solids for the 505 from woodleigh. I see no need to go to .510 any longer

If you need a 505 Gibbs reamer I have a finish reamer and gages for sale. It has cut 2 chambers
435-755-6842

700 nitro, that had to hurt, ive seen some of Mr Breedings work, its all 5 star craftsmanship.

Idaho Sharpshooter, i was lookin to start load dev. w/ the 600 woodies, both soft and solid, rifle should be here in mid oct. bet those valves in that bull You shot are bigger than any valves i got in a race hemi.

Michael Robinson, What did the soft do @+2300? im not sure my final load will exceed that vel., but it would be nice to have that option.

Roscoe, perzackly what i ordered 600 woodleighs soft/solid hope the rifle likes them, if not ill try tsx's.

Mr. Echols, thanks for the offer, but clearwater is doing the rechamber for me , im not quite that talented on the production end of firearms.

Thanks, Jerry

jerry, when driven too fast, the Woodleigh softs flatten like pancakes and suffer from inadequate penetration.

They are designed for specific impact velocities, and IMHO, even those are optimistic.