I dont remember asking a question about which twist to use

Rob,
man, that's just mean... you've got the troll playing along and thinking it is fooling someone into thinking it has a big bore...

jeffe

quote:

Originally posted by tankhunter:
I dont remember asking a question about which twist to use

No you did not, a terrible oversight of a most critical issue.

That is the first thing you must decide.

The sine qua non.

And you have totally ignored it.

Never fear, the day is saved. Now you know.

Well i do have a cz 416 as a donor rifle and a Lothar Walthar barrel blank which has a 1:15 twist [which took long enough to get hold of ]nobody makes 50 calibre barrels in Australia to the best of my knowledge ,so we cannot pick and choose which twist we want.Importing anything into Australia to do with firearms is a major hassle .This isnt a Troll and i dont make Trolling posts and i dont hijack other peoples posts .

But look at the entertainment value that resulted, and not a highjack at all. It was pertinent to the 500a2. The A-Square-made 500a2's as well as the 50 Peacekeepers of SSK are 10" twist. Madness?

You'll do fine with the stubby bullets in a 15" twist.

Tankhunter
trust me, sir, the troll comment was NOT directed at you.

The 500a2/510wells rifles are excellent rounds, worth the trouble, and can be alot of fun. Rebarrling a 416 rigby is the most direct way to get there, ,as well.

jeffe

All- My little foray into levity was hysterical and I must say I enjoyed it. Glad there are no hard feelings as I was SPOOFING the TWIST DEBATE not in any way atacking the person! RIP's OK in my book!
In reality, I have personally built a few 500a2's both with 1:15 twists and they work perfectly. Why 1:15? Well my other .50 BMG,s all use 1:15 and lets see I've shot 4.5 inch groups in FCSA competition with them. Does it work, YOU BET IT DOES! I agree with Jeffe, the easiest route to a functional 500a2 is a CZ 550 in .416 Rigby and a 1:15 pac-nor barrel or equivalent. It takes about 15 minutes with a file to get a CZ 550 action to feed the .500 a2. You do need to open the ribs on the mag box also, but thats it. Don't forget the barrel mounted recoil lug too.-Rob

Rob & RIP - several years back I also asked the same question as tankhunter and I took your advice - I based my 500 off the cz550/rigby platform with a pacnor barrel and stock work by AHR - feeds great, shoots great, no problems at all - the numbers of swirly thingies inside the barrel ? Nope, not telling as it doesn't matter to me since all my shooting is inside of 75 yards and I seriously doubt the animal will know the difference .

Thanks again for your advice.

KMule

jeffeosso,

Just who were the troll remarks directed to?

What a cheery "twist" of the thread.

FWIW- When I was first designing the 12GaFH I gave serious thought to zero twist, i.e. a smoothbore. At the pressures I was designing for, I didn't want any addiotional problems, and for a gun designed to be used at 25 yrds or less, I seriously doubt there would be enough loss of accuracy to matter. In the end, I went 1:22 SLOW SLOW SLOW as I was firing very long 2000 gr bore riders at up to 600 yrds.
Remember each barrel is a compromise. If you were going to shoot only 750 A-maxs out of a 500a2 Which are very long bullets, then a 1:9-1:12 twist will be optimum. If your going hunting and want to optimize the barrel for much shorter bullets, and will be shooting at 100yrds then 1:15 makes sense. At 25 yrds IT won't matter if its a smoothbore in reality.-Rob