.50 caliber 1:72 twist and 405 conicals

[buckweet]

hello....
just gotten an e/mail from a man saying this 42'' 1:72 twist barrel i have should shoot one hole groups at 100. with 405 grain conicals.

whats you guys thoughts on this ?
im under the impression, it'ed be a round baller only.

just kicking this out there.

[stubshaft]

It'll shoot "one hole" groups one shot at a time (a new group with each shot).

It is definitely a RB barrel. I had one on an old CVA with this twist and for the life of me I couldn't get it to shoot conicals. The closest I got was with the old "Ballets".

[buckweet]

It'll shoot "one hole" groups one shot at a time (a new group with each shot).

It is definitely a RB barrel. I had one on an old CVA with this twist and for the life of me I couldn't get it to shoot conicals. The closest I got was with the old "Ballets".




kinda what i was athinkin too.

:mrgreen: ''[a new group with each shot]'' lol !!

can you explain that just a little better ? tell us how you really feel.....ha !!

[mooman76]

It's way to slow a twist to shoot conicals, especially one as big as a 405g. I tried the Lee REALs in my 50 with a 1/66 twist and they would shoot but it's a shorter bullet and it wouldn't shoot that great. It should shoot RBs real good though. Maybe he meant 100 inches.

[buckweet]

ha, yep 100 inches.

just amazes me, reading some of the velocity's a .50 can get with slow twist and PRB's.

and mines a 42'' barrel, should really push em out there.

[357maximum]

:veryconfuI would ask him what he is smokin personally.:veryconfu:veryconfu

[qajaq59]

What twist rate is it that requires you to switch over from round balls to the conicals to maintain accuracy? And would 1/28 be a compromise for both?

[357maximum]

In my travels I have found:

1/48 will do PRB okay but not at high velocity. 1/48 will do lighter solid base conicals real well at upper end. 1/48 does just okay with heavyweight conicals.

1 in 48 is the "compromise" twist according to alot of folks.

IMHO it is not a compromise...it is a light 275 grain (ish) maxi hunter or R.E.A.L star, but not so great with PRB with full charges. That is why I asked BRP to rough clone the lighter maxi-hunter. It does real well in my CVA and TC "compromise" barrels.

1/28 is not a compromise...it is a plastic sabot and heavy conical twist according to me. PRB only work at slingshot speeds in them.

I so not believe a "compromise" to shoot all types of projos in a frontstuffer exists...that is just my opinion though. I have never played with one of the 1in 36 twisters.

If you want to shoot PRB at full throttle you need to go with the 1in 66 to or slower twists. The claim mentioned at the beginning of this thread is ridicules and humorous to me.

[qajaq59]

Well, since I want to shoot the conicals I guess I'll do ok with them.

[mooman76]

There's a formula out ther called the Green hill formula. It estimates what you need in barrel twist rate. It is not absolute as nothing is but it will get you close.

[qajaq59]

There's a formula out there called the Green hill formula.
Here's the address if anyone wants it.
http://www.z-hat.com/twistrate.htm

[buckweet]

hey, thanks. for posting the formula, gajaq59.
interesting.


weet

[buckweet]

In my travels I have found:

1/48 will do PRB okay but not at high velocity. 1/48 will do lighter solid base conicals real well at upper end. 1/48 does just okay with heavyweight conicals.

1 in 48 is the "compromise" twist according to alot of folks.

IMHO it is not a compromise...it is a light 275 grain (ish) maxi hunter or R.E.A.L star, but not so great with PRB with full charges. That is why I asked BRP to rough clone the lighter maxi-hunter. It does real well in my CVA and TC "compromise" barrels.

1/28 is not a compromise...it is a plastic sabot and heavy conical twist according to me. PRB only work at slingshot speeds in them.

I so not believe a "compromise" to shoot all types of projos in a frontstuffer exists...that is just my opinion though. I have never played with one of the 1in 36 twisters.

If you want to shoot PRB at full throttle you need to go with the 1in 66 to or slower twists. The claim mentioned at the beginning of this thread is ridicules and humorous to me.



thanks max, for the insight.

hows that boot pistol workin out ?

[357maximum]

thanks max, for the insight.

hows that boot pistol workin out ?

I am liking it alot. Very pleased to have it.

[10 ga]

Buckweet, Its a RB barrel. Put 110 gr of FFF Swiss behind a .490 RB with a tight patch and it'll be hummin. Will probably shoot good with only a change in elevation of POI as velocity varies if you use any where from 50 to 110 gr of BP. 110 is my hunting load in a 66 twist 50 cal. and drop to 70 gr for small game and plinkin. Same POI under 50 yd. Really cheap shootin. Best, 10 ga

[buckweet]

Buckweet, Its a RB barrel. Put 110 gr of FFF Swiss behind a .490 RB with a tight patch and it'll be hummin. Will probably shoot good with only a change in elevation of POI as velocity varies if you use any where from 50 to 110 gr of BP. 110 is my hunting load in a 66 twist 50 cal. and drop to 70 gr for small game and plinkin. Same POI under 50 yd. Really cheap shootin. Best, 10 ga

thanks 10ga,

lookin forward to these rifles, :)

[Boz330]

It's way to slow a twist to shoot conicals, especially one as big as a 405g. I tried the Lee REALs in my 50 with a 1/66 twist and they would shoot but it's a shorter bullet and it wouldn't shoot that great. It should shoot RBs real good though. Maybe he meant 100 inches.


I got the same thing from my 50 cal 66 twist and REALs. I didn't have enough confidence from the first results to even consider it for deer.

Bob

[ihunts2much]

"That is why I asked BRP to rough clone the lighter maxi-hunter."

Excuse my ignorance but who is BRP? Is this mold available?

[ihunts2much]

Never-mind, the search function is a wonderful tool. Now I gotta buy another mold:roll:

[357maximum]

"That is why I asked BRP to rough clone the lighter maxi-hunter."

Excuse my ignorance but who is BRP? Is this mold available?

THE MOULD IS AVAILABLE. If you go down to the vendor sponsor area and look at BRP products you will see the mould on the rifle page. I believe he calls it the 50-275 MH Clone. TC 275 grainers were highly liked in a few 1/48 twisters of mine. They never did make that mould public <mistake> . I wanted a mould and BRP was kind enought to fullfill my wishes through several tries in diameter even.


He perfected the diameter and it is a wonderfully accurate projectile in my TC and cva 1:48 barrels.