1-8 twist - 220 Swift vs 22-6MM (224 TTH) with 70-85 gr bullets

[Hbb6601]

Thanks 357Mag. If I can get 75 gr bullet over 3300 with a 28" barrel I will be happy for sure if it is accurate at that speed. No PD's around here so it should last me a long time

Hbb -

Howdy !

Forgot to mention..... may Hart 24" SS 1-14 chambered in .2-35Rem wildcat went 3,420rnds before keyholing its first bullet.

And that, after first few years of cleaning barrel w/o a coated rod. Also, I stupidly did a cryo on the barrel when it was already past the 1/2 way point of its life. Chunks of throat fell out, similar to look of dry lake bed.

My point:
.35Rem case capacity necked to .224" cal readily gave 3,420 good shots It undoubtedly would have faired even better;
had I cleaned correctly from the git-go; and skipped the ( late ) cryo.

Speed costs $$$..... How fast do you want to go ?!

Regards,
357MAg

 

[wboggs]

Did you ever have a chance to try Norma MRP in your Clark? It is the best powder in my .22-6mm and should be available late this year or early in 2013.

 

[Carolina Man]

No, never tried the MRP. Used 204, 205 and 4350, 4831. Norma powders then were not always avaliable and varied lot to lot. Just about time you would get a good load going then no more powder till next year. I think I would be looking at some other powder choices.

Have you tried any RL-19 or 22?

Contact me via PM been wanting to talk to you about your rifle but lost your older PM's.

Aaron

 

[40X Guy]

Just got off phone with Kiff and my reamer is on order. Standard .220 Swift with .078 freebore and a .254 chamber set up for Norma brass and 75 A-Max. 6 week turn a round time. He knew the freebore off the top of his head as he is shooting a fast twist Swift also. Cool guy and first time i have talked to him.

Frank

 

[wboggs]

Did you ever try Norma MRP in your Clark? So far, my .22-6mm is holding up using MRP and limititing shots strings to 3. I have a deer load using 70gr Barnes TSX at 3700+, 3800 if you don't mind .0002-.0004 case head expansion in a hunting load. All from a 30" Krieger.
The orginal Clark data got top velocity and accuracy with MRP and is the reason I gave it a try. It is also best in my standard version.

 

[357Mag]

Hbb & 40X -

Theres' hundred million powder burn rate charts.

After reviewing one I look at alot, I'll say this....
The powder choices being talked about, lie in the H4350 - RL-22 range.
Most of what was listed on the chart, I'll list here; w/ a couple of comments from my shooting observations( my loads, my gun ):

WW760 - best combo for accuracy = 41.2gr in .22-35Rem wildcat w/ 24" 1-14 and 55 SX Hornady
H4350
VV160 - best combo for speed = 41.6gr in .22-35Rem wildcat w/ 24" 1-14 and 55"V"-Max
VV560
I4350 - best powder w/ 60gr bullets
I4831
AA3100 - best combo of accuracy and speed = 40.5gr in .22-35Rem wildcat w/ 28" 1-8 and 75gr bullets
H4831
WMR
MRP
RL-22 - best combo for accuracy = 43.7gr RL-22 in " Deep 6 " wildcat ( 6X47 - 6XC capacity range ) w/ 29" 1-8 88-105gr bullets

Comment:
- A lot of it comes down to whether you're a believer in " high load density", ( which I am ).
If you are a fan of hyer vel, you'd probably have chosen "Varget" for speed w/ the 55s.

- The "Deep 6" wildcat reference, lists a chuck-full case of RL-22; w/ cas e having capacity about 2gr < .243Win.

IMHO -

AA3100 should be a good candidate powder, for use w/ 75s in a 29" .224" calibre 1-8 barrel


Regards,
357Mag