faster twist 22-250

[SLAYIN'SWEDE]

In my 9 twist, 60gr TMK's, 65gr SBT's and 70gr RDF's are all very accurate w/RL17.

 

[flatlander]

I used several 1-9tw Bartleins & Kriegers chambered in 22-250AI for guys around here a few years ago. One of them was shooting the Hornady 75 AMax at just over 3400fps out of his. When the throat got a little rough, RL22 was blowing them up, so he switched to RL17, got the same velocity, but the bullets stopped blowing up. Both those powders are hard on throats, but I saw a comparison of the pressure curves of both, and RL17 had a much more gradual curve approaching max pressure, while RL22's 'curve' was much faster rise to peak pressure.

 

[Bocephus]

The 75's will probably shoot fine for you but with that 9tw they'll probably be at a reduced BC. The Sierra 69gr TMK would probably make for a slick bullet choice at full BC.

B23 nailed it!
In my experience the 75A-max is very iffy in a 9twt at my elevation. But the 69 MK, TMK and Berger 70’s are solid performers. Obviously if the 75’s aren’t stable, then the BC is only a paper number...and a serious miss at any significant distance.
Maybe ask me how I know....

 

[mikecr]

Go by what the bullet maker declares for a standard atmosphere (like Std.Metro, or ICAO).
If the bullet maker doesn't declare, doesn't know, then don't use their bullets.

 

[AckleymanII]

if you are not hunting in a deep freeze, AA2700 will dramatically increase your barrel life vs R#15.

Check the heat index chart for powders.

I am running a 22/243 AI with a 14 twist shooting the 60g Sierra at 4000, throat wear is very minimal, and we found this to be true when running 22/250, AI, 243, AI. 4064 and R#15 eats barrel throats in high volume shooting.

The Heat Index chart is a real eye opener as to barrel wear and powder choices.

If you could beg some 60g Sierra tipped match kings from someone, you would be very very happy in a 9T, 22/250.

My 9T shilen would not stabilize the 75g A max.

 

[357Mag]

I recently acquired an almost new 9TW 22-250. What is an appropriate weight bullet to start with?
(Varmint/target types) I have no experience with this twist---I always have shot 50-55 grns through 12 and 14 twists...
I have looked and think around 75 grns??? Thanks in advance, marc

All -

Howdy !

The newest Hornady catalogue does not list a .224" calibre 75"A"-Max.

For .224" cal, they do list both a 73gr and a 75gr " ELD-M.

I used the 75"A"-Max w/ my " .22-35 Remington " wildcat, shot from a 28" SS 1-8 K & P; for use on groundhogs. Have not tried the two ELD-Ms listed above, for the same use. But, they'd be the Hornady product I would try, to supplant the 75 "A"-Max.


With regards,
357Mag